Email deliverability and testing tools · November 2026 Edition
GlockApps vs MXToolbox
Eight of fourteen models named GlockApps first on the direct prompt; zero named MXToolbox. GlockApps was named by fourteen of the fourteen models and MXToolbox by thirteen and GlockApps carries 57 labels and MXToolbox 32, so the shares are not directly comparable.
Named in one category this edition.
Named in one category this edition.
First-choice share38%2%Of first choices across the direct, paraphrase, budget and scale prompts, 0 to 100.
Negative rate9%6%Negative labels as a share of the product's labels, 0 to 100.
Rank in category#1#5A position in a field of 19; printed, not drawn.
Labels5732A count; the two differ.
The two percentage rows are drawn on one 0 to 100 track, GlockApps reading right to left. Rank and label count are printed, not drawn.GlockApps vs Google Postmaster Tools · GlockApps vs Litmus · GlockApps vs ZeroBounce
Share is the count of first choices across the direct, paraphrase, budget and scale prompts over all fourteen models, for a mid-market B2B company; rank is within the category; every quote names the model and the prompt it came from. Both figures come from the email deliverability and testing tools page.
By framing
How many of the fourteen models made each the first choice, per way of asking, and how many argued against it.
GlockAppsFirst choices, of fourteen modelsMXToolbox
Direct80
Paraphrase100
Comparative91
Budget-constrained011 against GlockApps
Scale-constrained10
Negative214 against GlockApps · 2 against MXToolbox
Bars are first choices, 0 to 14 each sideModels that argued againstA model can name both, so the two sides of a row do not sum to fourteen.
Across every category in the November 2026 Edition, GlockApps and MXToolbox were named in the same answer sixty-four times, of the 161 answers naming GlockApps and the 80 naming MXToolbox. In those answers MXToolbox took the first choice seven times and GlockApps eighteen.
Every model, every framing
The eighty-four answers behind the chart above, one cell each: where GlockApps and MXToolbox stood in it.
| Model | Direct | Paraphrase | Comparative | Budget-constrained | Scale-constrained | Negative |
|---|---|---|---|---|---|---|
| Claude Haiku 4.5 | | | | | | |
| GPT-5.4 mini | | | ||||
| Gemini 3.5 Flash | | | | | | |
| Perplexity Sonar | | | | | | |
| Grok 4.20 | | | | | | |
| Mistral Small | | | | |||
| DeepSeek V4 Flash | | | | | | |
| Llama 4 Maverick | | |||||
| Qwen 3.7 Flash | | | | | ||
| Kimi K2 | | | | | ||
| GLM 4.7 FlashX | | | | | ||
| MiniMax M2.5 | | | | | | |
| GPT-6 Luna | | | | | ||
| Muse Glimmer 30B | | | | | | |
GlockApps MXToolbox first choice named as an alternative argued againstblank: not namedEach cell is one answer, GlockApps on the left and MXToolbox on the right.The direct prompt
The plain question, one answer per model, grouped by where GlockApps and MXToolbox stood in it.
GlockApps first, MXToolbox not the choice
8 of 14 modelsMXToolbox was named in the answer but not as the choice, or not at all.Gemini 3.5 FlashGlockApps alternatives: Folderly, Google Postmaster Tools, Mailgun Optimize, Mailtrap Email Sandbox, Microsoft Smart Network Data Services (SNDS) / Microsoft 365 Admin Insights
Perplexity SonarGlockApps alternatives: EasyDMARC, Google Postmaster Tools, MailReach, Microsoft SNDS, NeverBounce, Validity Everest, ZeroBounce, dmarcian
Grok 4.20GlockApps alternatives: Allegrow, Validity Everest
Llama 4 MaverickGlockApps alternatives: MailReach, Validity Everest
Qwen 3.7 FlashGlockApps, ZeroBounce alternatives: Kickbox, NeverBounce, Red Sift OnDMARC, SendForensics, Suped, Validity Everest
GLM 4.7 FlashXGlockApps alternatives: Allegrow, MailReach
GPT-6 LunaGlockApps alternatives: Google Postmaster Tools, Validity Engage
Muse Glimmer 30BGlockApps, MailGenius alternatives: Allegrow, Amplemarket
Neither was the first choice, one was named
4 of 14 modelsThe answer put something else first and named one of the two as an alternative.Claude Haiku 4.5Warmy alternatives: Act-On, GlockApps, MailReach, Mailtrap Email Marketing
DeepSeek V4 FlashHubSpot Sales Hub alternatives: GlockApps, Klaviyo, Lemlist, Mailgun, Outreach, Salesloft, SendGrid
Kimi K2Allegrow alternatives: GlockApps, MailReach
MiniMax M2.5HubSpot Sales Hub, ZeroBounce alternatives: Copper, GlockApps, MXToolbox
Neither was named
2 of 14 modelsThe answer made no first choice from these two in this category.GPT-5.4 miniLitmus alternatives: Brevo, HubSpot, Salesforce/Marketing Cloud, ZeroBounce
Mistral SmallAllegrow, Validity Everest alternatives: Litmus
Bold names in an answer are the products the judge labeled a first choice; a model naming several gives each of them that label. The full answer text for every row is in the record.
By buyer segment
The same question asked on behalf of a different buyer. Each standing is computed within its segment and they are never added together. The figures above are the mid-market standing, which is the one the category orders by.
Small business
GlockApps leads by twenty points.
GlockApps25%#1 of 15MXToolbox5%#6 of 15Mid-marketThe figures above
GlockApps leads by thirty-six points.
GlockApps38%#1 of 19MXToolbox2%#5 of 19Enterprise
GlockApps leads by eight points.
GlockApps8%#3 of 17MXToolbox0%#16 of 17What the models said about GlockApps
Every negative label with a quote, up to three, then the highest-weighted positives, up to three. Six of eight in this category shown.
“Seed-list placement testers such as GlockApps, Unspam, or similar tools: useful for directional comparisons, but test accounts do not behave like real subscribers” Perplexity Sonar · negative prompt · soft negative
“GlockApps primarily uses syntax and DNS checks, which can miss subtle delivery issues like greylisting or role account filters.” Muse Glimmer 30B · negative prompt · soft negative
“Tools like GlockApps, Mail-Tester, and similar seed-list platforms have significant limitations” DeepSeek V4 Flash · negative prompt · soft negative
“The best email deliverability tool for a mid-market B2B company is GlockApps, as it offers the best all-in-one diagnostics for mid-market teams.” Llama 4 Maverick · direct prompt · first choice
“GlockApps is cited as the most comprehensive email deliverability platform for testing where mail lands across Gmail, Outlook, Yahoo and others” Muse Glimmer 30B · direct prompt · first choice
“Top-rated for scheduled inbox placement testing, spam scoring, and heatmap reports... Often praised as the best balance of features and cost.” Grok 4.20 · comparative prompt · first choice
What the models said about MXToolbox
Every negative label with a quote, up to three, then the highest-weighted positives, up to three. Five of six in this category shown.
“Blocklist-only monitors such as MXToolbox or Heatwave: a clean result does not mean good deliverability” Perplexity Sonar · negative prompt · soft negative
“basic free blocklist checkers (in isolation) ... Over-reliance can give false confidence.” Grok 4.20 · negative prompt · soft negative
“start with Google Postmaster Tools and MXToolbox, which are both free and cover the most common starting points” Claude Haiku 4.5 · budget prompt · first choice
“Use free tools (Google Postmaster, MXToolbox, Microsoft SNDS) for monitoring” MiniMax M2.5 · negative prompt · first choice
“Start with free tools like MXToolbox and Google Postmaster for diagnostics.” Grok 4.20 · comparative prompt · first choice
Also compared
GlockApps vs Google Postmaster ToolsGlockApps vs LitmusGlockApps vs ZeroBounceGlockApps vs MailReachGlockApps vs Validity EverestGlockApps vs Mail-TesterGoogle Postmaster Tools vs MXToolboxLitmus vs MXToolboxZeroBounce vs MXToolboxMXToolbox vs MailReachMXToolbox vs Validity EverestMXToolbox vs Mail-TesterAll twenty-eight head-to-head pages and the full email deliverability standing
Comparisons are drawn for the top eight products in each category, each against each. The output is the models' output; nothing here is a recommendation by the index.