Email deliverability and testing tools for enterprise buyers
Asked as “email deliverability tool”, and as “inbox placement and email testing platform”, on behalf of an enterprise B2B company. 50 first choices recorded across the direct, paraphrase, budget and scale prompts, fourteen models each. Added to the November 2026 Edition.
Standing · first-choice share
46%
Clear leader
46Validity Everest10Validity Engage08GlockApps36others
46% of first choices, clear leader.
Since October 2026▲+1Since October 2026: 45% → 46%, +1 point. Inside the 11-point floor: within noise.Validity Everest held the lead, +1 point on 45%, inside the 11-point floor.
By buyer segment
The same question asked on behalf of a different buyer. Each standing is computed within its segment; they sit side by side and are never added together.
Small business
GlockApps25%Contested▲+1Since October 2026: 24% → 25%, +1 point. Inside the 11-point floor: within noise.Standing →Mid-marketGlockApps38%Contested▲+4Since October 2026: 34% → 38%, +4 points. Inside the 11-point floor: within noise.Standing →Enterprise
Validity Everest46%Clear leader▲+1Since October 2026: 45% → 46%, +1 point. Inside the 11-point floor: within noise.This page
GlockApps25%Contested▲+1Since October 2026: 24% → 25%, +1 point. Inside the 11-point floor: within noise.Standing →Mid-marketGlockApps38%Contested▲+4Since October 2026: 34% → 38%, +4 points. Inside the 11-point floor: within noise.Standing →EnterpriseValidity Everest46%Clear leader▲+1Since October 2026: 45% → 46%, +1 point. Inside the 11-point floor: within noise.This pageThe standing
Share is the count of first choices across the direct, paraphrase, budget and scale prompts, over all fourteen models, for an enterprise B2B company. Ordered by share.
ProductFirst-choice shareNegative rateLabelsQuadrantSince October 2026
01Validity Everest46%0%43endorsed leader▲+1Since October 2026: 45% → 46%, +1 point. Inside the 11-point floor: within noise.45% → 46%
Validity Everest46%0%43endorsed leader▲+1Since October 2026: 45% → 46%, +1 point. Inside the 11-point floor: within noise.45% → 46%02
Validity Engage10%0%12accepted challenger▲+4Since October 2026: 6% → 10%, +4 points. Inside the 11-point floor: within noise.6% → 10%
Validity Engage10%0%12accepted challenger▲+4Since October 2026: 6% → 10%, +4 points. Inside the 11-point floor: within noise.6% → 10%03GlockApps8%16%50accepted challenger▲+6Since October 2026: 2% → 8%, +6 points. Inside the 11-point floor: within noise.2% → 8%
GlockApps8%16%50accepted challenger▲+6Since October 2026: 2% → 8%, +6 points. Inside the 11-point floor: within noise.2% → 8%04
Mailgun Optimize6%8%13accepted challenger▲+6Since October 2026: 0% → 6%, +6 points. Inside the 11-point floor: within noise.0% → 6%
Mailgun Optimize6%8%13accepted challenger▲+6Since October 2026: 0% → 6%, +6 points. Inside the 11-point floor: within noise.0% → 6%05
Mailgun4%5%21accepted challenger▼−2Since October 2026: 6% → 4%, −2 points. Inside the 11-point floor: within noise.6% → 4%
Mailgun4%5%21accepted challenger▼−2Since October 2026: 6% → 4%, −2 points. Inside the 11-point floor: within noise.6% → 4%06
Inbox Monster4%8%13accepted challenger▲+2Since October 2026: 2% → 4%, +2 points. Inside the 11-point floor: within noise.2% → 4%
Inbox Monster4%8%13accepted challenger▲+2Since October 2026: 2% → 4%, +2 points. Inside the 11-point floor: within noise.2% → 4%07
Instantly4%30%10criticized challenger▼−2Since October 2026: 6% → 4%, −2 points. Inside the 11-point floor: within noise.6% → 4%
Instantly4%30%10criticized challenger▼−2Since October 2026: 6% → 4%, −2 points. Inside the 11-point floor: within noise.6% → 4%08
Litmus2%16%25accepted challenger▼−4Since October 2026: 6% → 2%, −4 points. Inside the 11-point floor: within noise.6% → 2%
Litmus2%16%25accepted challenger▼−4Since October 2026: 6% → 2%, −4 points. Inside the 11-point floor: within noise.6% → 2%09
ZeroBounce2%18%22accepted challenger▲+2Since October 2026: 0% → 2%, +2 points. Inside the 11-point floor: within noise.0% → 2%
ZeroBounce2%18%22accepted challenger▲+2Since October 2026: 0% → 2%, +2 points. Inside the 11-point floor: within noise.0% → 2%10
SendGrid2%14%14accepted challenger▼−4Since October 2026: 6% → 2%, −4 points. Inside the 11-point floor: within noise.6% → 2%
SendGrid2%14%14accepted challenger▼−4Since October 2026: 6% → 2%, −4 points. Inside the 11-point floor: within noise.6% → 2%Show the seven products at 0%, ordered by negative rate
17
MailReach0%54%13criticized challenger▼−2Since October 2026: 2% → 0%, −2 points. Inside the 11-point floor: within noise.2% → 0%
MailReach0%54%13criticized challenger▼−2Since October 2026: 2% → 0%, −2 points. Inside the 11-point floor: within noise.2% → 0%16
MXToolbox0%27%11criticized challenger=heldSince October 2026: 0% → 0%, ±0 points. Inside the 11-point floor: within noise.0% → 0%
MXToolbox0%27%11criticized challenger=heldSince October 2026: 0% → 0%, ±0 points. Inside the 11-point floor: within noise.0% → 0%14
Folderly0%25%16criticized challenger▼−2Since October 2026: 2% → 0%, −2 points. Inside the 11-point floor: within noise.2% → 0%
Folderly0%25%16criticized challenger▼−2Since October 2026: 2% → 0%, −2 points. Inside the 11-point floor: within noise.2% → 0%15
EasyDMARC0%17%12accepted challenger=heldSince October 2026: 0% → 0%, ±0 points. Inside the 11-point floor: within noise.0% → 0%
EasyDMARC0%17%12accepted challenger=heldSince October 2026: 0% → 0%, ±0 points. Inside the 11-point floor: within noise.0% → 0%12Google Postmaster Tools Lab in the set0%14%14accepted challenger=heldSince October 2026: 0% → 0%, ±0 points. Inside the 11-point floor: within noise.0% → 0%
13
Mailtrap Email Sandbox0%14%14accepted challenger=heldSince October 2026: 0% → 0%, ±0 points. Inside the 11-point floor: within noise.0% → 0%
Mailtrap Email Sandbox0%14%14accepted challenger=heldSince October 2026: 0% → 0%, ±0 points. Inside the 11-point floor: within noise.0% → 0%11Microsoft SNDS0%0%14accepted challenger=heldSince October 2026: 0% → 0%, ±0 points. Inside the 11-point floor: within noise.0% → 0%
The floor is 11 points of share, measured: how far the models move a leader on their own when the same questions are asked twice with nothing changed. A larger change is movement; a smaller one can't be told apart from repeat variation, and both are shown. Each index measures its own floor from its own repeat, over its own categories, so the floor differs from one index to the next. Both editions asked the same fourteen models. How the floor is measured
Bars are the share of first choices, 0 to 100Every product with at least 10 labels here. Every product name links to its product page.
Google Postmaster Tools is made by Google, whose model Gemini 3.5 Flash is in the set. On the four share prompts that model made it the first choice zero times of 4; the other thirteen models zero times of 52. Lab treatment is defined on the method page; the row is marked, not excluded.
For buyers
Head to headHead-to-head pages are published for mid-market buyers, so these open on mid-market figures, not enterprise.
All twenty-eight head-to-head pages: the top eight products, each against each
GlockApps vs MXToolboxGlockApps vs MailReachGlockApps vs Validity EverestGlockApps vs Mail-TesterGoogle Postmaster Tools vs LitmusGoogle Postmaster Tools vs ZeroBounceGoogle Postmaster Tools vs MXToolboxGoogle Postmaster Tools vs MailReachGoogle Postmaster Tools vs Validity EverestGoogle Postmaster Tools vs Mail-TesterLitmus vs ZeroBounceLitmus vs MXToolboxLitmus vs MailReachLitmus vs Validity EverestLitmus vs Mail-TesterZeroBounce vs MXToolboxZeroBounce vs MailReachZeroBounce vs Validity EverestZeroBounce vs Mail-TesterMXToolbox vs MailReachMXToolbox vs Validity EverestMXToolbox vs Mail-TesterMailReach vs Validity EverestMailReach vs Mail-TesterValidity Everest vs Mail-Tester
Recommended versus criticized
Every product with at least 10 labels here, on both axes. The 30% line names a quadrant, not the verdict above: that one needs more than 40%.
Criticized challengerCriticized default
Negative label rate →
01020304050607080910M11
G12
1314151617Accepted challengerEndorsed leader
0%First-choice share → · lines at 30% share and 25% negative60%
Key
01Validity Everest46%
Validity Everest46%02Validity Engage10%
Validity Engage10%03GlockApps8%
GlockApps8%04Mailgun Optimize6%
Mailgun Optimize6%05Mailgun4%
Mailgun4%06Inbox Monster4%
Inbox Monster4%07Instantly4%
Instantly4%08Litmus2%
Litmus2%09ZeroBounce2%
ZeroBounce2%10SendGrid2%
SendGrid2%11Microsoft SNDS0%
12Google Postmaster Tools0%
13Mailtrap Email Sandbox0%
Mailtrap Email Sandbox0%14Folderly0%
Folderly0%15EasyDMARC0%
EasyDMARC0%16MXToolbox0%
MXToolbox0%17MailReach0%
MailReach0%What they warned about
Five of fourteen models held their first choice under the paraphrase. Claude Haiku 4.5, GPT-5.4 mini, Perplexity Sonar, Mistral Small, Llama 4 Maverick, Kimi K2, GLM 4.7 FlashX, MiniMax M2.5 and GPT-6 Luna changed. A high negative share on a product with few labels is a warning. A low share on a product with many labels is salience, not sentiment.
Mail-Tester67%
6 of 9 labels negative · 6 of 14 models · 4 hard negative
“Free consumer-grade checkers such as mail-tester.com for production go/no-go decisions... repeatedly flagged for enterprise use because it scores against a single seed address.” Muse Glimmer 30B, negative prompt
GlockApps16%
8 of 50 labels negative · 5 of 14 models · 2 hard negative
“What to Avoid for Your Use Case ... GlockApps | Great for mid-market diagnostics, but priced per test ... scales poorly for enterprise teams.” DeepSeek V4 Flash, budget prompt
MailReach54%
7 of 13 labels negative · 4 of 14 models · 4 hard negative
“Traditional Email Warmup Tools (e.g., Warmbox, Mailreach, or generic "inbox warmup" services)... Why avoid/cautious?” Grok 4.20, negative prompt
Folderly25%
4 of 16 labels negative · 4 of 14 models · 2 hard negative
“Tools to be cautious about: Warmup Inbox, Folderly's auto-warm features” DeepSeek V4 Flash, negative prompt
What they cite
Fourteen of the fourteen models returned a source list in this edition: five return the pages they cited and nine the search results they consulted.
Sites the answers cite
75 of 84 answers in this category came back with a source list, from 14 of 14 models: citations where the model returns them, or the search results it consulted. 903 links across 222 sites, every framing counted. Ranked by the number of answers carrying the site or page. 7 of the 252 answers across every segment cited this index's own page for the category; the method page measures whether that reading tilts an answer.
26 answers · 28 citations · 11 models
vendor site · Instantly25 answers · 35 citations · 12 models
vendor site · Mailgun23 answers · 46 citations · 10 models
vendor site · Validity20 answers · 30 citations · 9 models
20 answers · 28 citations · 9 models
vendor site · Amplemarket19 answers · 19 citations · 9 models
vendor site · Unspam18 answers · 21 citations · 9 models
vendor site · Smartlead18 answers · 19 citations · 10 models
vendor site · MailTester15 answers · 40 citations · 9 models
vendor site · Prospeo15 answers · 20 citations · 8 models
vendor site · Mailtrap15 answers · 16 citations · 9 models
vendor site · Sender13 answers · 15 citations · 7 models
Pages the answers cite
The ten pages named in the most answers, by full address. A page here is one the models returned with a recommendation, not one the index endorses.
19 answers · 9 models
19 answers · 9 models
16 answers · 10 models
13 answers · 9 models
12 answers · 8 models
12 answers · 7 models
12 answers · 6 models
11 answers · 8 models
10 answers · 7 models
9 answers · 6 models
Search against answers
Each company's standing in the answers beside its site's footprint in Google search, one row a site: the products the models named on it with their shares, and the share they add up to; monthly searches on Google, and DataForSEO's estimate of AI search demand (modeled from search signals, directional, not a count of queries to any assistant), for the most-searched of the company's and its products' names (the name is in each row's hover text); estimated monthly organic visits to the site; and its best position in Google's top ten for “best email deliverability tool”, “email deliverability tool”. US estimates from DataForSEO and Google's Ads Transparency Center. A small company's site, or a mid-sized company's site for its flagship, is marked company; a product on a large parent's site (Google, Microsoft) has no site figures. A column with no figures for this category is left out, and an empty cell means none were seen, not none exist. Two measurements side by side: neither is read as the cause of the other.
| Company and products | Share | Own site cited | Name searches, Google | AI search demand, est. | Organic visits | Paid search a month, est. | Google ads, last 30 days |
|---|---|---|---|---|---|---|---|
| Validity validity.com Validity Everest 46%, Validity Engage 10% | 56% | 73 | 140 | 0 | 24,467 company | $264 | 120 |
| Mailgun mailgun.com Mailgun Optimize 6%, Mailgun 4% | 10% | 41 | 18,100 | 344 | 55,627 | $46 | 66 |
| GlockApps glockapps.com | 8% | 144 | 1,600 | 3 | 8,647 | 1 | |
| Inbox Monster inboxmonster.com | 4% | 20 | 720 | 4 | 730 | 7 | |
| Instantly instantly.ai | 4% | 107 | 74,000 | 87,944 | 59,881 | $986 | 17 |
| Litmus litmus.com | 2% | 56 | 12,100 | 2,310 | 38,533 | 15 | |
| ZeroBounce zerobounce.net | 2% | 250 | 9,900 | 118 | 38,183 | $778 | 120 |
| Twilio sendgrid.com SendGrid 2% | 2% | 38 | 135,000 | 4,343 | 22,206 | ||
| TrulyInbox trulyinbox.com | 2% | 8 | |||||
| Amplemarket amplemarket.com | 2% | 25 | 3,600 | 8 | 12,067 | 8 |
Google's top ten for the two searches hold 17 sites; 1 of them are among the sites the models cited here (mailtester.com). The first result for “best email deliverability tool” is devopsschool.com.
How they answered
Six framings of the same buying question, each sent to every model in a fresh session with search on. One row per model, so a row shows whether it held its answer under rewording, what it named when cost was the constraint, and what it argued against. Computed from the raw judge labels.ShowHide
How they answered
Six framings of the same buying question, each sent to every model in a fresh session with search on. One row per model, so a row shows whether it held its answer under rewording, what it named when cost was the constraint, and what it argued against. Computed from the raw judge labels.
ShowHideModelDirect“What is the best email deliverability tool for an enterprise B2B company?”Paraphrase“Which inbox placement and email testing platform would you recommend to a large B2B company with thousands of employees?”Comparative“What are the top enterprise-grade email deliverability and testing tools and how do they differ?”Budget-constrained“What is the best email deliverability tool for a large company that needs predictable total cost across thousands of users?”Scale-constrained“We are a 5,000 person company with SSO, SOC 2 and procurement review requirements evaluating an email deliverability tool. What should we look at?”Negative“Which email deliverability and testing tools should a large enterprise avoid or be cautious about?”
Claude Haiku 4.5SalesforceInbox MonsterChangedValidity EverestTrulyInboxno first choiceagainst: Apollo.io, Bouncer, Emailable, Hunter, Instantly, Smartlead
Three alternatives
HubSpot, Validity Engage, Validity EverestTwo alternatives
Folderly, Validity EngageFour alternatives
Email on Acid, GlockApps, Litmus, Mailgun OptimizeTwo alternatives
GlockApps, Validity EverestGPT-5.4 miniValidity EngageLitmus, Validity EverestChangedEverest, Validity EngageMailgunno first choiceagainst: Litmus, Mailchimp
Five alternatives
Adobe Marketo Engage, Iterable, Litmus, Salesforce Agentforce Marketing, ZeroBounceTwo alternatives
Inbox Monster, InboxAllyTwo alternatives
Mailgun Inbox Placement Testing, Mailgun InspectOne alternative
Validity EngageGemini 3.5 FlashValidity EverestValidity EverestHeldLitmus, Validity EverestInstantly, Smartlead, Validity Everestagainst: Folderly, HubSpot, Mixmaxno first choiceagainst: Instantly Warmup, Lemwarm, Mail-Tester, Mail-Warm, MailGenius, MailReach, Warmup Your Email, Warmy
Ten alternatives
Allegrow, BriteVerify, Folderly, GlockApps, Google Postmaster Tools, InboxMonster, Microsoft SNDS, Red Sift, Valimail, ZeroBounceFour alternatives
Email on Acid, GlockApps, Litmus, Mailgun OptimizeThree alternatives
GlockApps, Inbox Monster, SinchThree alternatives
Mailtrap Delivery Platform, PowerDMARC, ValimailPerplexity SonarValidity EngageInbox MonsterChangedValidity Everestagainst: Warmup Inbox, WarmyValidity Everestagainst: Amplemarketno first choiceagainst: Mail-Tester, Mailtrap Email Sandbox, NeverBounce, ZeroBounce
Eight alternatives
BriteVerify, EasyDMARC, GlockApps, Kickbox, Mailgun, Postmark, SocketLabs, ZeroBounceTwo alternatives
GlockApps, Validity EverestEight alternatives
GlockApps, Google Postmaster Tools, Litmus, MXToolbox, Mailgun Optimize, Mailtrap Email Sandbox, NeverBounce, ZeroBounceTwo alternatives
EasyDMARC, GlockAppsGrok 4.20Validity Everestagainst: EasyDMARC, Email on Acid, Litmus, MXToolbox, MailReach, MailerCheckValidity EverestHeldLitmus, Validity EverestValidity Everestagainst: Bouncer, Google Postmaster Tools, MXToolbox, Mailtrap Email Sandbox, ZeroBounceno first choiceagainst: Clearout, EasyDMARC, GlockApps, Hypertide, Kickbox, LUNATRO.MX, MXToolbox, Mail-Tester, MailReach, MailRun, MightyMail, Sending.ac, Warmbox, ZeroBounce
Four alternatives
Allegrow, GlockApps, Google Postmaster Tools, Microsoft SNDSThree alternatives
GlockApps, InboxAlly, MailReachFour alternatives
Email on Acid, GlockApps, Mailgun Optimize, Unspam.emailFour alternatives
GlockApps, Mailgun, SocketLabs, TrulyInboxMistral SmallGlockApps, Validity EngageGlockApps, ZeroBounceChangedValidity EverestValidity Everestagainst: Folderly, Mailgun Optimizeno first choicenothing named
Three alternatives
Everest, Mailgun, PowerDMARCTwo alternatives
Mailgun Optimize, Validity EverestThree alternatives
Folderly, GlockApps, MailReachOne alternative
InstantlyDeepSeek V4 FlashValidity EverestValidity EverestHeldGlockApps, Validity EverestValidity Everestagainst: GlockApps, MailReach, Mailgun, Postmark, SendGrid, Warmboxno first choiceagainst: Folderly, GMass, GlockApps, IsNotSpam, Litmus, Mail-Tester, MailReach, Spamcheck, Unspam, Warmup Inbox
One alternative
GlockAppsFive alternatives
GlockApps, Inbox Monster, Litmus, Mailgun Optimize, ZeroBounceFive alternatives
Google Postmaster Tools, Litmus, Mailgun, Mailtrap Email Deliverability, Microsoft SNDSThree alternatives
SocketLabs, TrulyInbox, ZeroBounceLlama 4 MaverickValidity Everestno first choiceChangedno first choiceValidity Everestno first choiceagainst: GlockApps, Inbox Monster
Three alternatives
GlockApps, Mailtrap Email Sandbox, ZeroBounceThree alternatives
GlockApps, MailReach, MailwarmQwen 3.7 FlashValidity EverestValidity EverestHeldLitmusValidity Everestagainst: GlockApps, Instantly, Lemlist, MailGenius, NeverBounce, ZeroBouncePostmarkagainst: Amazon SES, Klaviyoagainst: Amazon SES, Email on Acid, GMass, GlockApps, Inbox Sports, Instantly, Litmus, Mail-Tester, SenderScore
Two alternatives
Folderly, GlockAppsFive alternatives
Dmarc.io, EasyDMARC, Folderly, GlockApps, MailgunFour alternatives
GlockApps, Mailtrap Email Sandbox, SurePassage, Validatie / ReturnPathFour alternatives
Mailgun, Outreach, Salesloft, SendGridTwo alternatives
Braze, SendGridKimi K2Validity EverestValidity EngageChangedValidity Everestagainst: SendGridMailgun OptimizeMailgun, SendGridagainst: Amazon SESagainst: Fortra, Proofpoint Email Fraud Defense, Valimail
Two alternatives
Inbox Monster, SendGridOne alternative
Inbox MonsterSix alternatives
Email on Acid, Folderly, GlockApps, Litmus, Mailgun, SendForensicsThree alternatives
Amazon SES with Virtual Deliverability Manager, SendGrid, Validity EverestOne alternative
Mailtrap Email SandboxGLM 4.7 FlashXValidity Everestagainst: Google Postmaster ToolsGlockAppsChangedValidity EverestValidity Everestno first choicenothing named
Three alternatives
GlockApps, Mailgun, SendGridThree alternatives
Litmus, MXToolbox, MailReachThirteen alternatives
Email Industries, Email on Acid, Folderly, GlockApps, Google Postmaster Tools, InboxAlly, Litmus, MailReach, Microsoft SNDS, Unspam, Warmy, ZeroBounce, dmarcianTwo alternatives
Folderly, MailerCheckMiniMax M2.5AmplemarketGlockApps, Validity EverestChangedValidity EverestMailgun Optimizeno first choiceagainst: Amazon SES, Iterable, Postmarkagainst: Kickbox
Four alternatives
GlockApps, Mailgun, Mailwarm, ZeroBounceThree alternatives
Google Postmaster Tools, Instantly, Microsoft SNDSFive alternatives
GlockApps, Icemail.ai, Mailgun, SendGrid, ZeroBounceThree alternatives
EasyDMARC, Instantly, Mailtrap Email SandboxGPT-6 LunaValidity's Everest deliverability platformValidity EngageChangedInbox Monster, Validity EngageMailgun Optimizeno first choicenothing named
One alternative
Inbox MonsterOne alternative
LitmusFour alternatives
GlockApps, Litmus, Mailgun Inspect, Mailgun OptimizeOne alternative
Validity EngageMuse Glimmer 30BValidity EverestValidity EverestHeldValidity EverestInstantlyagainst: Folderly, GlockApps, MailReachno first choiceagainst: GMass Tester, GlockApps, Mail-Tester, MailReach, Unspam
Two alternatives
Amplemarket, GlockAppsTwo alternatives
GlockApps, LitmusFour alternatives
GlockApps, Google Postmaster Tools, Litmus, Microsoft SNDSTwo alternatives
Everest, InboxEagleBold is the first choiceAlternatives are counted; the count opens them.What the answer argued against
The record
One row per call: the version string exactly as returned, whether the model searched, sources cited, and latency.
Eighty-four rows: every prompt, every model, every answer.
| Prompt | Model | Version string | Time (UTC) | Searched | Sources | Latency |
|---|---|---|---|---|---|---|
| Direct recommendation | Claude Haiku 4.5 | claude-haiku-4-5-20251001 | 2026-11-01 13:04 | yes | 9 | 7 s |
| Direct recommendation | GPT-5.4 mini | gpt-5.4-mini-2026-03-17 | 2026-11-01 15:49 | yes | 4 | 5 s |
| Direct recommendation | Gemini 3.5 Flash | gemini-3.6-flash (asked for gemini-3.5-flash; the API answered as this version) | 2026-11-01 16:19 | yes | 11 | 18 s |
| Direct recommendation | Perplexity Sonar | sonar | 2026-11-01 11:59 | yes | 10 | 3 s |
| Direct recommendation | Grok 4.20 | spacexai/grok-4.20-non-reasoning via xai | 2026-11-01 15:59 | yes | 5 | 9 s |
| Direct recommendation | Mistral Small | mistral/mistral-small via mistral | 2026-11-01 14:25 | yes | 5 | 5 s |
| Direct recommendation | DeepSeek V4 Flash | deepseek/deepseek-v4-flash via deepinfra | 2026-11-01 10:37 | yes | 19 | 19 s |
| Direct recommendation | Llama 4 Maverick | meta/llama-4-maverick via bedrock | 2026-11-01 10:03 | yes | 5 | 3 s |
| Direct recommendation | Qwen 3.7 Flash | alibaba/qwen3.7-flash via alibaba | 2026-11-01 13:40 | yes | 10 | 51 s |
| Direct recommendation | Kimi K2 | moonshotai/kimi-k2 via novita | 2026-11-01 16:16 | yes | 25 | 38 s |
| Direct recommendation | GLM 4.7 FlashX | zai/glm-4.7-flashx via zai | 2026-11-01 10:11 | yes | 25 | 39 s |
| Direct recommendation | MiniMax M2.5 | minimax/minimax-m2.5 via minimax | 2026-11-01 14:53 | yes | 5 | 50 s |
| Direct recommendation | GPT-6 Luna | gpt-6-luna | 2026-11-01 14:34 | yes | 2 | 17 s |
| Direct recommendation | Muse Glimmer 30B | meta/muse-glimmer-30b via togetherai | 2026-11-01 17:28 | yes | 25 | 30 s |
| Paraphrase | Claude Haiku 4.5 | claude-haiku-4-5-20251001 | 2026-11-01 09:05 | yes | 10 | 8 s |
| Paraphrase | GPT-5.4 mini | gpt-5.4-mini-2026-03-17 | 2026-11-01 12:01 | yes | 2 | 5 s |
| Paraphrase | Gemini 3.5 Flash | gemini-3.6-flash (asked for gemini-3.5-flash; the API answered as this version) | 2026-11-01 11:11 | no | 0 | 16 s |
| Paraphrase | Perplexity Sonar | sonar | 2026-11-01 10:12 | yes | 10 | 3 s |
| Paraphrase | Grok 4.20 | spacexai/grok-4.20-non-reasoning via xai | 2026-11-01 14:50 | yes | 10 | 9 s |
| Paraphrase | Mistral Small | mistral/mistral-small via mistral | 2026-11-01 11:22 | yes | 5 | 5 s |
| Paraphrase | DeepSeek V4 Flash | deepseek/deepseek-v4-flash via deepinfra | 2026-11-01 10:09 | yes | 23 | 23 s |
| Paraphrase | Llama 4 Maverick | meta/llama-4-maverick via bedrock | 2026-11-01 12:25 | yes | 5 | 2 s |
| Paraphrase | Qwen 3.7 Flash | alibaba/qwen3.7-flash via alibaba | 2026-11-01 12:37 | yes | 5 | 31 s |
| Paraphrase | Kimi K2 | moonshotai/kimi-k2 via novita | 2026-11-01 16:15 | yes | 20 | 23 s |
| Paraphrase | GLM 4.7 FlashX | zai/glm-4.7-flashx via zai | 2026-11-01 15:30 | yes | 25 | 36 s |
| Paraphrase | MiniMax M2.5 | minimax/minimax-m2.5 via minimax | 2026-11-01 09:06 | yes | 5 | 56 s |
| Paraphrase | GPT-6 Luna | gpt-6-luna | 2026-11-01 09:35 | yes | 2 | 12 s |
| Paraphrase | Muse Glimmer 30B | meta/muse-glimmer-30b via togetherai | 2026-11-01 11:40 | yes | 19 | 18 s |
| Comparative | Claude Haiku 4.5 | claude-haiku-4-5-20251001 | 2026-11-01 16:23 | yes | 10 | 10 s |
| Comparative | GPT-5.4 mini | gpt-5.4-mini-2026-03-17 | 2026-11-01 12:24 | yes | 4 | 11 s |
| Comparative | Gemini 3.5 Flash | gemini-3.6-flash (asked for gemini-3.5-flash; the API answered as this version) | 2026-11-01 11:40 | yes | 8 | 30 s |
| Comparative | Perplexity Sonar | sonar | 2026-11-01 17:01 | yes | 10 | 9 s |
| Comparative | Grok 4.20 | spacexai/grok-4.20-non-reasoning via xai | 2026-11-01 16:02 | yes | 5 | 21 s |
| Comparative | Mistral Small | mistral/mistral-small via mistral | 2026-11-01 10:07 | yes | 14 | 11 s |
| Comparative | DeepSeek V4 Flash | deepseek/deepseek-v4-flash via deepinfra | 2026-11-01 16:42 | yes | 22 | 76 s |
| Comparative | Llama 4 Maverick | meta/llama-4-maverick via bedrock | 2026-11-01 09:32 | yes | 5 | 3 s |
| Comparative | Qwen 3.7 Flash | alibaba/qwen3.7-flash via alibaba | 2026-11-01 15:36 | no | 0 | 30 s |
| Comparative | Kimi K2 | moonshotai/kimi-k2 via novita | 2026-11-01 11:55 | yes | 25 | 38 s |
| Comparative | GLM 4.7 FlashX | zai/glm-4.7-flashx via zai | 2026-11-01 10:43 | yes | 15 | 32 s |
| Comparative | MiniMax M2.5 | minimax/minimax-m2.5 via minimax | 2026-11-01 12:58 | yes | 5 | 30 s |
| Comparative | GPT-6 Luna | gpt-6-luna | 2026-11-01 13:05 | yes | 6 | 32 s |
| Comparative | Muse Glimmer 30B | meta/muse-glimmer-30b via togetherai | 2026-11-01 17:01 | yes | 22 | 38 s |
| Budget constrained | Claude Haiku 4.5 | claude-haiku-4-5-20251001 | 2026-11-01 12:47 | yes | 18 | 9 s |
| Budget constrained | GPT-5.4 mini | gpt-5.4-mini-2026-03-17 | 2026-11-01 15:44 | yes | 4 | 5 s |
| Budget constrained | Gemini 3.5 Flash | gemini-3.6-flash (asked for gemini-3.5-flash; the API answered as this version) | 2026-11-01 12:28 | yes | 7 | 21 s |
| Budget constrained | Perplexity Sonar | sonar | 2026-11-01 13:30 | yes | 10 | 3 s |
| Budget constrained | Grok 4.20 | spacexai/grok-4.20-non-reasoning via xai | 2026-11-01 16:46 | yes | 10 | 8 s |
| Budget constrained | Mistral Small | mistral/mistral-small via mistral | 2026-11-01 12:41 | yes | 5 | 5 s |
| Budget constrained | DeepSeek V4 Flash | deepseek/deepseek-v4-flash via deepinfra | 2026-11-01 13:42 | yes | 25 | 31 s |
| Budget constrained | Llama 4 Maverick | meta/llama-4-maverick via bedrock | 2026-11-01 15:04 | yes | 5 | 3 s |
| Budget constrained | Qwen 3.7 Flash | alibaba/qwen3.7-flash via alibaba | 2026-11-01 10:50 | yes | 10 | 86 s |
| Budget constrained | Kimi K2 | moonshotai/kimi-k2 via novita | 2026-11-01 12:15 | yes | 24 | 44 s |
| Budget constrained | GLM 4.7 FlashX | zai/glm-4.7-flashx via zai | 2026-11-01 10:18 | yes | 22 | 51 s |
| Budget constrained | MiniMax M2.5 | minimax/minimax-m2.5 via minimax | 2026-11-01 08:42 | yes | 17 | 67 s |
| Budget constrained | GPT-6 Luna | gpt-6-luna | 2026-11-01 14:25 | yes | 2 | 17 s |
| Budget constrained | Muse Glimmer 30B | meta/muse-glimmer-30b via togetherai | 2026-11-01 16:46 | yes | 23 | 29 s |
| Scale constrained | Claude Haiku 4.5 | claude-haiku-4-5-20251001 | 2026-11-01 08:36 | no | 0 | 7 s |
| Scale constrained | GPT-5.4 mini | gpt-5.4-mini-2026-03-17 | 2026-11-01 09:13 | yes | 0 | 7 s |
| Scale constrained | Gemini 3.5 Flash | gemini-3.6-flash (asked for gemini-3.5-flash; the API answered as this version) | 2026-11-01 14:15 | no | 0 | 19 s |
| Scale constrained | Perplexity Sonar | sonar | 2026-11-01 10:05 | yes | 10 | 8 s |
| Scale constrained | Grok 4.20 | spacexai/grok-4.20-non-reasoning via xai | 2026-11-01 16:32 | yes | 12 | 23 s |
| Scale constrained | Mistral Small | mistral/mistral-small via mistral | 2026-11-01 10:29 | no | 0 | 7 s |
| Scale constrained | DeepSeek V4 Flash | deepseek/deepseek-v4-flash via deepinfra | 2026-11-01 10:28 | yes | 9 | 27 s |
| Scale constrained | Llama 4 Maverick | meta/llama-4-maverick via bedrock | 2026-11-01 08:47 | yes | 5 | 3 s |
| Scale constrained | Qwen 3.7 Flash | alibaba/qwen3.7-flash via alibaba | 2026-11-01 17:05 | yes | 10 | 47 s |
| Scale constrained | Kimi K2 | moonshotai/kimi-k2 via novita | 2026-11-01 16:14 | yes | 15 | 25 s |
| Scale constrained | GLM 4.7 FlashX | zai/glm-4.7-flashx via zai | 2026-11-01 09:01 | yes | 12 | 55 s |
| Scale constrained | MiniMax M2.5 | minimax/minimax-m2.5 via minimax | 2026-11-01 12:12 | no | 0 | 17 s |
| Scale constrained | GPT-6 Luna | gpt-6-luna | 2026-11-01 10:45 | yes | 2 | 21 s |
| Scale constrained | Muse Glimmer 30B | meta/muse-glimmer-30b via togetherai | 2026-11-01 10:54 | yes | 12 | 22 s |
| Negative framing | Claude Haiku 4.5 | claude-haiku-4-5-20251001 | 2026-11-01 10:28 | yes | 19 | 10 s |
| Negative framing | GPT-5.4 mini | gpt-5.4-mini-2026-03-17 | 2026-11-01 16:15 | yes | 3 | 7 s |
| Negative framing | Gemini 3.5 Flash | gemini-3.6-flash (asked for gemini-3.5-flash; the API answered as this version) | 2026-11-01 09:16 | no | 0 | 16 s |
| Negative framing | Perplexity Sonar | sonar | 2026-11-01 12:41 | yes | 10 | 4 s |
| Negative framing | Grok 4.20 | spacexai/grok-4.20-non-reasoning via xai | 2026-11-01 15:22 | yes | 15 | 14 s |
| Negative framing | Mistral Small | mistral/mistral-small via mistral | 2026-11-01 09:52 | yes | 5 | 5 s |
| Negative framing | DeepSeek V4 Flash | deepseek/deepseek-v4-flash via deepinfra | 2026-11-01 12:46 | yes | 24 | 64 s |
| Negative framing | Llama 4 Maverick | meta/llama-4-maverick via bedrock | 2026-11-01 14:35 | yes | 5 | 4 s |
| Negative framing | Qwen 3.7 Flash | alibaba/qwen3.7-flash via alibaba | 2026-11-01 10:21 | no | 0 | 37 s |
| Negative framing | Kimi K2 | moonshotai/kimi-k2 via novita | 2026-11-01 15:47 | yes | 24 | 63 s |
| Negative framing | GLM 4.7 FlashX | zai/glm-4.7-flashx via zai | 2026-11-01 12:14 | yes | 24 | 32 s |
| Negative framing | MiniMax M2.5 | minimax/minimax-m2.5 via minimax | 2026-11-01 10:57 | yes | 24 | 67 s |
| Negative framing | GPT-6 Luna | gpt-6-luna | 2026-11-01 13:57 | yes | 4 | 24 s |
| Negative framing | Muse Glimmer 30B | meta/muse-glimmer-30b via togetherai | 2026-11-01 11:41 | yes | 25 | 38 s |
Normalization in this category
Every judgment call made between the raw labels and the numbers above, listed so it is visible and reversible.
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Category-scoped readings
Mailtrap read as Mailtrap Email Sandbox
Mailtrap (Enterprise tier) read as Mailtrap Email Sandbox
Validity (Everest or Return Path) read as Validity Everest
Validity (Everest platform) read as Validity Everest
Validity (Everest) read as Validity Everest
Validity (formerly Return Path, now part of Validity with the Everest platform) read as Validity Everest
Validity (specifically the Engage/Everest platform) read as Validity Everest
Unresolved, counted raw
Agari
Amazon SES with Virtual Deliverability Manager
Dmarc.io
E-Warmup
Hypertide
Icemail.ai
Inbox Sports
InboxEagle
InboxMonster
Instantly Warmup
IsNotSpam
LUNATRO.MX
MXToolbox Delivery Center
Mail-Warm
MailRun
Mailflow
Mailgun Inbox Placement Testing
Mailtrap Delivery Platform
Mailtrap Email Deliverability
MightyMail
Mystrika
Outreach Growth Plan
Red Sift (OnDMARC)
SNDS
Salesforce
Sending.ac
Sinch Mailgun Optimize
SurePassage
Trend Micro
Twilio
Validatie / ReturnPath
Validity's Everest deliverability platform
Warmup Your Email
Discontinued, still offered
No shut-down product was recommended here.