Email deliverability and testing tools for small business buyers
Asked as “email deliverability tool”, and as “inbox placement and email testing platform”, on behalf of a small B2B company. 56 first choices recorded across the direct, paraphrase, budget and scale prompts, fourteen models each. Added to the November 2026 Edition.
Standing · first-choice share
25%
Contested · Sender 12%
25GlockApps12Sender11Instantly52others
25% of first choices, contested.
Since October 2026▲+1Since October 2026: 24% → 25%, +1 point. Inside the 11-point floor: within noise.GlockApps held the lead, +1 point on 24%, 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.This pageMid-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.Standing →
GlockApps25%Contested▲+1Since October 2026: 24% → 25%, +1 point. Inside the 11-point floor: within noise.This pageMid-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.Standing →The standing
Share is the count of first choices across the direct, paraphrase, budget and scale prompts, over all fourteen models, for a small B2B company. Ordered by share.
ProductFirst-choice shareNegative rateLabelsQuadrantSince October 2026
01GlockApps25%6%54accepted challenger▲+1Since October 2026: 24% → 25%, +1 point. Inside the 11-point floor: within noise.24% → 25%
GlockApps25%6%54accepted challenger▲+1Since October 2026: 24% → 25%, +1 point. Inside the 11-point floor: within noise.24% → 25%02
Sender12%0%10accepted challenger▲+10Since October 2026: 2% → 12%, +10 points. Past the 11-point floor: movement.2% → 12%
Sender12%0%10accepted challenger▲+10Since October 2026: 2% → 12%, +10 points. Past the 11-point floor: movement.2% → 12%03
Instantly11%0%15accepted challenger▲+6Since October 2026: 5% → 11%, +6 points. Inside the 11-point floor: within noise.5% → 11%
Instantly11%0%15accepted challenger▲+6Since October 2026: 5% → 11%, +6 points. Inside the 11-point floor: within noise.5% → 11%04
Mail-Tester7%6%35accepted challenger▲+1Since October 2026: 6% → 7%, +1 point. Inside the 11-point floor: within noise.6% → 7%
Mail-Tester7%6%35accepted challenger▲+1Since October 2026: 6% → 7%, +1 point. Inside the 11-point floor: within noise.6% → 7%05Google Postmaster Tools Lab in the set5%0%36accepted challenger▼−5Since October 2026: 10% → 5%, −5 points. Inside the 11-point floor: within noise.10% → 5%
06
MXToolbox5%3%37accepted challenger▼−1Since October 2026: 6% → 5%, −1 point. Inside the 11-point floor: within noise.6% → 5%
MXToolbox5%3%37accepted challenger▼−1Since October 2026: 6% → 5%, −1 point. Inside the 11-point floor: within noise.6% → 5%07
MailerLite5%0%11accepted challenger▲+3Since October 2026: 2% → 5%, +3 points. Inside the 11-point floor: within noise.2% → 5%
MailerLite5%0%11accepted challenger▲+3Since October 2026: 2% → 5%, +3 points. Inside the 11-point floor: within noise.2% → 5%08
MailReach4%5%21accepted challenger▼−1Since October 2026: 5% → 4%, −1 point. Inside the 11-point floor: within noise.5% → 4%
MailReach4%5%21accepted challenger▼−1Since October 2026: 5% → 4%, −1 point. Inside the 11-point floor: within noise.5% → 4%09
Brevo4%0%13accepted challenger▲+2Since October 2026: 2% → 4%, +2 points. Inside the 11-point floor: within noise.2% → 4%
Brevo4%0%13accepted challenger▲+2Since October 2026: 2% → 4%, +2 points. Inside the 11-point floor: within noise.2% → 4%10
Unspam.email2%0%11accepted challenger▲+2Since October 2026: 0% → 2%, +2 points. Inside the 11-point floor: within noise.0% → 2%
Unspam.email2%0%11accepted challenger▲+2Since October 2026: 0% → 2%, +2 points. Inside the 11-point floor: within noise.0% → 2%11
Litmus2%59%22criticized challenger▼−3Since October 2026: 5% → 2%, −3 points. Inside the 11-point floor: within noise.5% → 2%
Litmus2%59%22criticized challenger▼−3Since October 2026: 5% → 2%, −3 points. Inside the 11-point floor: within noise.5% → 2%Show the four products at 0%, ordered by negative rate
15
Email on Acid0%29%14criticized challenger=heldSince October 2026: 0% → 0%, ±0 points. Inside the 11-point floor: within noise.0% → 0%
Email on Acid0%29%14criticized challenger=heldSince October 2026: 0% → 0%, ±0 points. Inside the 11-point floor: within noise.0% → 0%13
Mailtrap Email Sandbox0%14%21accepted challenger▼−2Since October 2026: 2% → 0%, −2 points. Inside the 11-point floor: within noise.2% → 0%
Mailtrap Email Sandbox0%14%21accepted challenger▼−2Since October 2026: 2% → 0%, −2 points. Inside the 11-point floor: within noise.2% → 0%12
ZeroBounce0%5%22accepted challenger▼−5Since October 2026: 5% → 0%, −5 points. Inside the 11-point floor: within noise.5% → 0%
ZeroBounce0%5%22accepted challenger▼−5Since October 2026: 5% → 0%, −5 points. Inside the 11-point floor: within noise.5% → 0%14Microsoft SNDS0%0%12accepted challenger▼−3Since October 2026: 3% → 0%, −3 points. Inside the 11-point floor: within noise.3% → 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 three times of 52. Lab treatment is defined on the method page; the row is marked, not excluded.
Head to headHead-to-head pages are published for mid-market buyers, so these open on mid-market figures, not small business.
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 →
01020304G05
0607080910111213M14
15Accepted challengerEndorsed leader
0%First-choice share → · lines at 30% share and 25% negative40%
Key
01GlockApps25%
GlockApps25%02Sender12%
Sender12%03Instantly11%
Instantly11%04Mail-Tester7%
Mail-Tester7%05Google Postmaster Tools5%
06MXToolbox5%
MXToolbox5%07MailerLite5%
MailerLite5%08MailReach4%
MailReach4%09Brevo4%
Brevo4%10Unspam.email2%
Unspam.email2%11Litmus2%
Litmus2%12ZeroBounce0%
ZeroBounce0%13Mailtrap Email Sandbox0%
Mailtrap Email Sandbox0%14Microsoft SNDS0%
15Email on Acid0%
Email on Acid0%What they warned about
Two of fourteen models held their first choice under the paraphrase. Claude Haiku 4.5, GPT-5.4 mini, Gemini 3.5 Flash, Perplexity Sonar, Mistral Small, DeepSeek V4 Flash, Llama 4 Maverick, Qwen 3.7 Flash, Kimi K2, MiniMax M2.5, GPT-6 Luna and Muse Glimmer 30B 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.
Litmus59%
13 of 22 labels negative · 9 of 14 models · 3 hard negative
“Don't Buy: High-End Testing Suites (Too Soon) Tools like Litmus or Pardot ... for a small business, buying them early is a waste of capital.” Qwen 3.7 Flash, negative prompt
Email on Acid29%
4 of 14 labels negative · 4 of 14 models · 2 hard negative
“Neither Litmus nor Email on Acid can tell you if your email avoids spam filters, lands in the primary inbox” Claude Haiku 4.5, negative prompt
Everest
80%
4 of 5 labels negative · 4 of 14 models
“Tools like GlockApps, Everest, and others rely on seed lists... paying for these when you could test directly to your own Gmail/Outlook accounts may be wasteful.” DeepSeek V4 Flash, negative prompt
Validity Everest62%
5 of 8 labels negative · 3 of 14 models · 2 hard negative
“High-Cost Enterprise Suites (Overkill / Financial Trap) * Examples: *Validity Everest (formerly Return Path / 250ok)*” Gemini 3.5 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
73 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. 799 links across 213 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.
29 answers · 40 citations · 11 models
27 answers · 32 citations · 10 models
vendor site · Unspam25 answers · 32 citations · 9 models
vendor site · Prospeo21 answers · 25 citations · 8 models
vendor site · MyEmailVerifier21 answers · 21 citations · 9 models
vendor site · GlockApps19 answers · 27 citations · 9 models
19 answers · 22 citations · 9 models
17 answers · 17 citations · 8 models
vendor site · Saleshandy16 answers · 16 citations · 11 models
vendor site · Mailgun14 answers · 22 citations · 9 models
vendor site · Capterra13 answers · 16 citations · 8 models
vendor site · Mailtrap13 answers · 14 citations · 8 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.
26 answers · 9 models
21 answers · 9 models
16 answers · 8 models
13 answers · 7 models
12 answers · 8 models
10 answers · 7 models
10 answers · 8 models
10 answers · 6 models
9 answers · 7 models
9 answers · 7 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 | Best Google position |
|---|---|---|---|---|---|---|---|---|
| GlockApps glockapps.com | 25% | 144 | 1,600 | 3 | 8,647 | 1 | ||
| Sender sender.net | 12% | 75 | 9,900 | 10,349 | 69,078 | 13 | ||
| Instantly instantly.ai | 11% | 107 | 74,000 | 87,944 | 59,881 | $986 | 17 | |
| MailTester mailtester.com Mail-Tester 7%, MailTester 2% | 9% | 62 | 5,400 | 93 | 3,496 | 4 | ||
| Google parent site Google Postmaster Tools 5% | 5% | 83 | 6,600 | 24 | ||||
| MXToolbox mxtoolbox.com | 5% | 75 | 60,500 | 126 | 453,570 | 18 | ||
| MailerLite mailerlite.com | 5% | 150 | 49,500 | 311 | 59,716 | $85 | 115 | |
| MailReach mailreach.co | 4% | 56 | 1,300 | 5 | 12,483 | 112 | ||
| Brevo brevo.com | 4% | 440 | 40,500 | 327 | 81,741 | $17,847 | 106 | |
| Unspam.email unspam.email | 2% | 20 |
Google's top ten for the two searches hold 17 sites; 0 of them are among the sites the models cited here. 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 a small B2B company?”Paraphrase“Which inbox placement and email testing platform would you recommend to a small business that sells to other businesses?”Comparative“What are the top email deliverability and testing tools for a small team and how do they differ?”Budget-constrained“What is the best email deliverability tool for a small company with a tight budget?”Scale-constrained“We are a 30 person company evaluating an email deliverability tool. What should we look at?”Negative“Which email deliverability and testing tools should a small business avoid or be cautious about?”
Claude Haiku 4.5no first choice250ok, LitmusChangedMail-Tester, Unspam.emailBrevo, Moosendno first choiceagainst: Email on Acid, Kickbox, Litmus, Mailtrap Email Sandbox, Spamcheck
One alternative
Return PathEight alternatives
GlockApps, Google Postmaster Tools, Litmus, MXToolbox, MailReach, Mailtrap Email Sandbox, Saleshandy Inbox Radar, WarmforgeFour alternatives
Glock Apps, HubSpot, MailerLite, WarmboxGPT-5.4 miniInstantlyGlockAppsChangedLitmusMailerLiteno first choicenothing named
Two alternatives
Bouncer, BrevoThree alternatives
Mailosaur, Mailtrap Email Sandbox, Validity EngageFour alternatives
Email on Acid, GlockApps, InboxAlly, PostmarkThree alternatives
GMass, Gmail Postmaster Tools, InstantlyGemini 3.5 FlashInstantly, SmartleadGlockAppsChangedagainst: Litmus, Return Path, Validity EverestMailtrap Email SandboxInstantlyno first choiceagainst: Everest, Validity Everestagainst: Email on Acid, Litmus, Validity Everest
Three alternatives
EasyDMARC, GlockApps, MailReachThree alternatives
Email on Acid, Folderly, MailReachFive alternatives
Email on Acid, GlockApps, Lemwarm, Mail-Tester, Warmup InboxSeven alternatives
GlockApps, Google Postmaster Tools, MXToolbox, Mail-Tester, MillionVerifier, Smartlead, Warmup InboxPerplexity SonarMailerCheckGlockAppsChangedagainst: Everest, LitmusGoogle Postmaster Tools, MXToolboxSenderno first choiceagainst: Mailgun Optimize, Mailpit, Mailtrap Email Sandbox, Validity Engage
Six alternatives
EasyDMARC, GlockApps, Google Postmaster Tools, MXToolbox, NeverBounce, ZeroBounceThree alternatives
MailReach, Mailslurp, Salesforge Inbox Placement TestSix alternatives
GlockApps, Litmus, Mailtrap Email Sandbox, Microsoft SNDS, Unspam.email, ZeroBounceFour alternatives
Google Postmaster Tools, MXToolbox, MailReach, MailerCheckGrok 4.20GlockAppsagainst: SendGridGlockAppsHeldMXToolbox, Mail-TesterGoogle Postmaster Tools, MXToolbox, Mail-Testerno first choiceagainst: Emailwarmup.com, GlockApps, Inbox Monster, Mail-Tester, MailReach, NeverBounce, Return Path, Validity Everest
Four alternatives
Brevo, Instantly, MXToolbox, MailReachFour alternatives
Litmus, MXToolbox, Mail-Tester, Unspam.emailFour alternatives
GlockApps, MailReach, Unspam.email, ZeroBounceFive alternatives
Brevo, GlockApps, MailerLite, Microsoft SNDS, SenderMistral SmallGlockApps, MailerLiteGlockAppsChangedGlockAppsSenderno first choicenothing named
One alternative
InstantlyTwo alternatives
Folderly, InstantlySix alternatives
Email on Acid, Folderly, Litmus, MXToolbox, Mailtrap Email Sandbox, ZeroBounceThree alternatives
Brevo, MailerLite, MoosendDeepSeek V4 FlashInstantlyGlockAppsChangedGlockAppsagainst: LitmusGoogle Postmaster Tools, MXToolbox, Mail-Testerno first choiceagainst: Everest, GlockApps, MailerCheck
Three alternatives
GlockApps, MailReach, ZeroBounceFour alternatives
Google Postmaster Tools, MailReach, Unspam.email, ZeroBounceSix alternatives
Email on Acid, MXToolbox, Mail-Tester, MailReach, Mailtrap Email Sandbox, Unspam.emailThree alternatives
EasyDMARC, Email Detective, Unspam.emailThree alternatives
Google Postmaster Tools, MXToolbox, PowerDMARCLlama 4 MaverickSenderno first choiceChangedno first choiceMailerLiteno first choiceagainst: MailerCheck
Four alternatives
Mail-Tester, MailGenius, Sender, UnspamQwen 3.7 FlashInstantly, LemlistWarmyChangedGlockApps, Mailtrap Email SandboxSenderagainst: Validity EverestGlockApps, MailTesteragainst: Litmus, Oracle Responsys, Salesforce Marketing Cloud, Salesforce Marketing Cloud Account Engagement
Four alternatives
EasyDMARC, GlockApps, MailReach, SenderThree alternatives
GlockApps, Instantly, Unspam.emailFour alternatives
Folderly, MailGenius, Unspam, ZeroBounceFive alternatives
Brevo, Email Detective, Google Postmaster Tools, MXToolbox, MailerLiteEight alternatives
Amazon SES, Instantly, Lemlist, Mailgun, Postmark, Resend, ValidSend, WarmboxKimi K2MailReachGlockAppsChangedagainst: LitmusBrevo, Mailgunagainst: Litmus, MailchimpUnspam.emailno first choiceagainst: Apollo.io, GMass, Klaviyo, MillionVerifier, Seamless.AI, ZeroBounce
Three alternatives
GlockApps, MXToolbox, ZeroBounceThree alternatives
Google Postmaster Tools, Mail-Tester, MailReachSeven alternatives
Email on Acid, GlockApps, Google Postmaster Tools, Mail-Tester, Mailtrap Email Sandbox, SendGrid, ZeroBounceFour alternatives
GlockApps, Google Postmaster Tools, MXToolbox, Mail-TesterGLM 4.7 FlashXGlockAppsagainst: Everest, Mailtrap Email SandboxGlockAppsHeldagainst: Email on Acid, LitmusGlockAppsagainst: LitmusEasyDMARC, Google Postmaster Tools, MXToolbox, Mail-Testerno first choiceagainst: ActiveCampaign, Constant Contact, HubSpot Marketing Hub, Kit, Mailchimp
One alternative
MailReachSeven alternatives
Inbox Monster, MXToolbox, Mail-Tester, MailGenius, Mailtrap Email Sandbox, Testi, UnspamSeven alternatives
Email on Acid, Google Postmaster Tools, MXToolbox, Mail-Tester, Mailgun, Mailtrap Email Sandbox, Microsoft SNDSSix alternatives
Amazon SES, Brevo, Constant Contact, GlockApps, MailerLite, Unspam.emailMiniMax M2.5InstantlyGlockAppsChangedagainst: LitmusGlockAppsagainst: LitmusBrevo, Senderno first choicenothing named
Two alternatives
Google Postmaster Tool, MXToolboxOne alternative
MailTesterSix alternatives
Email on Acid, Google Postmaster Tools, MXToolbox, Mail-Tester, Prospeo, ZeroBounceFour alternatives
Kit, MailerLite, Mailtrap Email Sandbox, UnspamGPT-6 LunaGlockAppsMailReachChangedGlockApps, Google Postmaster ToolsMail-Testeragainst: GlockAppsno first choicenothing named
Two alternatives
Google Postmaster Tools, MailReachTwo alternatives
GlockApps, Google Postmaster ToolsFour alternatives
Litmus, Mail-Tester, Mailgun Inspect, Mailtrap Email SandboxTwo alternatives
Google Postmaster Tools, PostmarkMuse Glimmer 30BSenderSalesforge Inbox Placement Test, Unspam Inbox Placement TestChangedGlockAppsagainst: Email on Acid, LitmusSenderno first choiceagainst: MXToolbox, Mail-Tester, MailGenius Mail Tester, aboutmy.email
Six alternatives
GlockApps, Google Postmaster Tools, MXToolbox, Mail-Tester, Mailgun, PostmarkThree alternatives
GlockApps, Instantly Inbox Placement Tool, MXToolboxFive alternatives
Google Postmaster Tools, MXToolbox, Mail-Tester, Mailtrap Email Sandbox, Microsoft SNDSFour alternatives
GlockApps, Google Postmaster Tools, MXToolbox, Mail-TesterBold 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 09:39 | no | 0 | 4 s |
| Direct recommendation | GPT-5.4 mini | gpt-5.4-mini-2026-03-17 | 2026-11-01 14:26 | yes | 3 | 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 13:51 | no | 0 | 14 s |
| Direct recommendation | Perplexity Sonar | sonar | 2026-11-01 11:14 | yes | 10 | 3 s |
| Direct recommendation | Grok 4.20 | spacexai/grok-4.20-non-reasoning via xai | 2026-11-01 15:02 | yes | 5 | 13 s |
| Direct recommendation | Mistral Small | mistral/mistral-small via mistral | 2026-11-01 10:42 | yes | 5 | 4 s |
| Direct recommendation | DeepSeek V4 Flash | deepseek/deepseek-v4-flash via deepinfra | 2026-11-01 09:35 | yes | 16 | 21 s |
| Direct recommendation | Llama 4 Maverick | meta/llama-4-maverick via bedrock | 2026-11-01 14:09 | yes | 5 | 3 s |
| Direct recommendation | Qwen 3.7 Flash | alibaba/qwen3.7-flash via alibaba | 2026-11-01 11:34 | yes | 5 | 39 s |
| Direct recommendation | Kimi K2 | moonshotai/kimi-k2 via novita | 2026-11-01 09:08 | yes | 9 | 24 s |
| Direct recommendation | GLM 4.7 FlashX | zai/glm-4.7-flashx via zai | 2026-11-01 10:35 | yes | 15 | 14 s |
| Direct recommendation | MiniMax M2.5 | minimax/minimax-m2.5 via minimax | 2026-11-01 10:33 | yes | 5 | 32 s |
| Direct recommendation | GPT-6 Luna | gpt-6-luna | 2026-11-01 12:27 | yes | 3 | 14 s |
| Direct recommendation | Muse Glimmer 30B | meta/muse-glimmer-30b via togetherai | 2026-11-01 16:02 | yes | 15 | 17 s |
| Paraphrase | Claude Haiku 4.5 | claude-haiku-4-5-20251001 | 2026-11-01 09:56 | no | 0 | 4 s |
| Paraphrase | GPT-5.4 mini | gpt-5.4-mini-2026-03-17 | 2026-11-01 15:35 | yes | 4 | 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 12:17 | yes | 9 | 22 s |
| Paraphrase | Perplexity Sonar | sonar | 2026-11-01 09:02 | yes | 10 | 3 s |
| Paraphrase | Grok 4.20 | spacexai/grok-4.20-non-reasoning via xai | 2026-11-01 14:07 | yes | 13 | 12 s |
| Paraphrase | Mistral Small | mistral/mistral-small via mistral | 2026-11-01 10:38 | yes | 5 | 5 s |
| Paraphrase | DeepSeek V4 Flash | deepseek/deepseek-v4-flash via deepinfra | 2026-11-01 13:14 | yes | 24 | 26 s |
| Paraphrase | Llama 4 Maverick | meta/llama-4-maverick via bedrock | 2026-11-01 16:09 | yes | 5 | 3 s |
| Paraphrase | Qwen 3.7 Flash | alibaba/qwen3.7-flash via alibaba | 2026-11-01 11:00 | yes | 5 | 28 s |
| Paraphrase | Kimi K2 | moonshotai/kimi-k2 via novita | 2026-11-01 14:18 | yes | 19 | 25 s |
| Paraphrase | GLM 4.7 FlashX | zai/glm-4.7-flashx via zai | 2026-11-01 13:53 | yes | 25 | 70 s |
| Paraphrase | MiniMax M2.5 | minimax/minimax-m2.5 via minimax | 2026-11-01 12:29 | yes | 15 | 46 s |
| Paraphrase | GPT-6 Luna | gpt-6-luna | 2026-11-01 16:12 | yes | 2 | 12 s |
| Paraphrase | Muse Glimmer 30B | meta/muse-glimmer-30b via togetherai | 2026-11-01 09:59 | yes | 13 | 21 s |
| Comparative | Claude Haiku 4.5 | claude-haiku-4-5-20251001 | 2026-11-01 14:42 | yes | 16 | 11 s |
| Comparative | GPT-5.4 mini | gpt-5.4-mini-2026-03-17 | 2026-11-01 11:26 | yes | 6 | 8 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 08:57 | no | 0 | 16 s |
| Comparative | Perplexity Sonar | sonar | 2026-11-01 15:39 | yes | 10 | 7 s |
| Comparative | Grok 4.20 | spacexai/grok-4.20-non-reasoning via xai | 2026-11-01 14:19 | yes | 5 | 16 s |
| Comparative | Mistral Small | mistral/mistral-small via mistral | 2026-11-01 15:24 | yes | 9 | 10 s |
| Comparative | DeepSeek V4 Flash | deepseek/deepseek-v4-flash via deepinfra | 2026-11-01 14:12 | yes | 16 | 22 s |
| Comparative | Llama 4 Maverick | meta/llama-4-maverick via bedrock | 2026-11-01 17:22 | yes | 5 | 3 s |
| Comparative | Qwen 3.7 Flash | alibaba/qwen3.7-flash via alibaba | 2026-11-01 13:49 | yes | 10 | 51 s |
| Comparative | Kimi K2 | moonshotai/kimi-k2 via novita | 2026-11-01 14:16 | yes | 15 | 23 s |
| Comparative | GLM 4.7 FlashX | zai/glm-4.7-flashx via zai | 2026-11-01 15:32 | yes | 25 | 66 s |
| Comparative | MiniMax M2.5 | minimax/minimax-m2.5 via minimax | 2026-11-01 12:31 | yes | 5 | 26 s |
| Comparative | GPT-6 Luna | gpt-6-luna | 2026-11-01 10:16 | yes | 7 | 21 s |
| Comparative | Muse Glimmer 30B | meta/muse-glimmer-30b via togetherai | 2026-11-01 11:23 | yes | 15 | 26 s |
| Budget constrained | Claude Haiku 4.5 | claude-haiku-4-5-20251001 | 2026-11-01 13:52 | yes | 9 | 8 s |
| Budget constrained | GPT-5.4 mini | gpt-5.4-mini-2026-03-17 | 2026-11-01 10:54 | yes | 2 | 7 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 09:24 | yes | 13 | 20 s |
| Budget constrained | Perplexity Sonar | sonar | 2026-11-01 10:10 | yes | 10 | 3 s |
| Budget constrained | Grok 4.20 | spacexai/grok-4.20-non-reasoning via xai | 2026-11-01 15:27 | yes | 10 | 11 s |
| Budget constrained | Mistral Small | mistral/mistral-small via mistral | 2026-11-01 16:17 | yes | 5 | 5 s |
| Budget constrained | DeepSeek V4 Flash | deepseek/deepseek-v4-flash via deepinfra | 2026-11-01 11:08 | yes | 18 | 21 s |
| Budget constrained | Llama 4 Maverick | meta/llama-4-maverick via bedrock | 2026-11-01 15:03 | yes | 5 | 2 s |
| Budget constrained | Qwen 3.7 Flash | alibaba/qwen3.7-flash via alibaba | 2026-11-01 09:56 | yes | 5 | 25 s |
| Budget constrained | Kimi K2 | moonshotai/kimi-k2 via novita | 2026-11-01 10:40 | yes | 13 | 20 s |
| Budget constrained | GLM 4.7 FlashX | zai/glm-4.7-flashx via zai | 2026-11-01 13:48 | yes | 25 | 68 s |
| Budget constrained | MiniMax M2.5 | minimax/minimax-m2.5 via minimax | 2026-11-01 15:36 | yes | 5 | 50 s |
| Budget constrained | GPT-6 Luna | gpt-6-luna | 2026-11-01 13:20 | yes | 5 | 17 s |
| Budget constrained | Muse Glimmer 30B | meta/muse-glimmer-30b via togetherai | 2026-11-01 13:38 | yes | 13 | 22 s |
| Scale constrained | Claude Haiku 4.5 | claude-haiku-4-5-20251001 | 2026-11-01 14:21 | no | 0 | 6 s |
| Scale constrained | GPT-5.4 mini | gpt-5.4-mini-2026-03-17 | 2026-11-01 14:48 | no | 0 | 6 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 13:52 | no | 0 | 17 s |
| Scale constrained | Perplexity Sonar | sonar | 2026-11-01 11:55 | yes | 10 | 6 s |
| Scale constrained | Grok 4.20 | spacexai/grok-4.20-non-reasoning via xai | 2026-11-01 16:00 | yes | 5 | 12 s |
| Scale constrained | Mistral Small | mistral/mistral-small via mistral | 2026-11-01 10:28 | no | 0 | 8 s |
| Scale constrained | DeepSeek V4 Flash | deepseek/deepseek-v4-flash via deepinfra | 2026-11-01 09:26 | yes | 9 | 44 s |
| Scale constrained | Llama 4 Maverick | meta/llama-4-maverick via bedrock | 2026-11-01 08:35 | yes | 5 | 3 s |
| Scale constrained | Qwen 3.7 Flash | alibaba/qwen3.7-flash via alibaba | 2026-11-01 12:34 | no | 0 | 29 s |
| Scale constrained | Kimi K2 | moonshotai/kimi-k2 via novita | 2026-11-01 10:46 | yes | 20 | 23 s |
| Scale constrained | GLM 4.7 FlashX | zai/glm-4.7-flashx via zai | 2026-11-01 16:29 | yes | 10 | 55 s |
| Scale constrained | MiniMax M2.5 | minimax/minimax-m2.5 via minimax | 2026-11-01 10:04 | no | 0 | 107 s |
| Scale constrained | GPT-6 Luna | gpt-6-luna | 2026-11-01 10:53 | yes | 3 | 24 s |
| Scale constrained | Muse Glimmer 30B | meta/muse-glimmer-30b via togetherai | 2026-11-01 14:56 | yes | 15 | 22 s |
| Negative framing | Claude Haiku 4.5 | claude-haiku-4-5-20251001 | 2026-11-01 10:51 | yes | 24 | 12 s |
| Negative framing | GPT-5.4 mini | gpt-5.4-mini-2026-03-17 | 2026-11-01 14:15 | yes | 6 | 13 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 11:08 | yes | 9 | 19 s |
| Negative framing | Perplexity Sonar | sonar | 2026-11-01 16:51 | yes | 10 | 5 s |
| Negative framing | Grok 4.20 | spacexai/grok-4.20-non-reasoning via xai | 2026-11-01 14:15 | yes | 10 | 11 s |
| Negative framing | Mistral Small | mistral/mistral-small via mistral | 2026-11-01 10:43 | yes | 5 | 5 s |
| Negative framing | DeepSeek V4 Flash | deepseek/deepseek-v4-flash via deepinfra | 2026-11-01 09:26 | yes | 24 | 22 s |
| Negative framing | Llama 4 Maverick | meta/llama-4-maverick via bedrock | 2026-11-01 15:11 | yes | 5 | 3 s |
| Negative framing | Qwen 3.7 Flash | alibaba/qwen3.7-flash via alibaba | 2026-11-01 16:40 | no | 0 | 34 s |
| Negative framing | Kimi K2 | moonshotai/kimi-k2 via novita | 2026-11-01 12:41 | yes | 25 | 81 s |
| Negative framing | GLM 4.7 FlashX | zai/glm-4.7-flashx via zai | 2026-11-01 14:33 | yes | 25 | 46 s |
| Negative framing | MiniMax M2.5 | minimax/minimax-m2.5 via minimax | 2026-11-01 13:44 | yes | 24 | 66 s |
| Negative framing | GPT-6 Luna | gpt-6-luna | 2026-11-01 12:21 | yes | 4 | 18 s |
| Negative framing | Muse Glimmer 30B | meta/muse-glimmer-30b via togetherai | 2026-11-01 10:22 | yes | 24 | 34 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
Saleshandy read as Saleshandy Inbox Radar
Validity read as Validity Everest
Warmy.io read as Warmy
Unresolved, counted raw
Delivra
Emailwarmup.com
Emelia
Google Postmaster Tool
Instantly Inbox Placement Tool
Mail Slurp
MailGenius Mail Tester
Mailgun's deliverability testing
Mailosaur
Mailpit
Postmastery
Testi
Unspam Inbox Placement Test
ValidSend
WarmupInbox
WarmySender
aboutmy.email
Discontinued, still offered
No shut-down product was recommended here.