Every category where a model named Email on Acid for a mid-market B2B company. Share is first choices across the direct, paraphrase, budget and scale prompts; rank is within every product named in that category.

Category	Function	Share	Rank	Negative rate	Labels	Quadrant	Since September 2026
Email deliverability and testing tools	Marketing	0%	25 of 110	8%	13	accepted challenger

Movement

This is the first edition on this tier, so no move can be computed for Email on Acid yet. From the next edition this section shows, per buyer segment and per category, whether its share moved by more than the measured noise floor.

By model

How each model treated Email on Acid across every prompt where it was named for a mid-market B2B company. Fourteen models, six prompts per category.

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Model	Alternative	Mention	Negative	Labels
Claude Haiku 4.5	0	0	1	1
GPT-5.4 mini	0	0	0	0
Gemini 3.5 Flash	2	0	0	2
Perplexity Sonar	0	0	0	0
Grok 4.1 Fast	3	0	0	3
Mistral Small	0	0	0	0
DeepSeek V4 Flash	1	0	0	1
Llama 4 Maverick	0	0	0	0
Qwen 3.7 Flash	0	1	0	1
Kimi K2	2	0	0	2
GLM 4.7 FlashX	0	0	0	0
MiniMax M2.5	0	0	0	0
GPT-6 Luna	1	0	0	1
Muse Glimmer 30B	1	1	0	2

By framing

Which of the six questions produced the naming. By model says how often; this says asked what. The first-choice count on the right carries the marks of the models that produced it.

FramingLabels by classFirst choices

Direct1 labelNone

Paraphrase10 labelsNone

Comparative20 labels4not counted in share

Budget-constrained1 labelNone

Scale-constrained0 labelsNone

Negative8 labelsNone

First choiceAlternativeMentionNegative40 labels in all, every segment counted; 0 of the 4 first choices count toward share, since the comparative and negative framings do not. The bar is one segment per label class, to scale within the framing.

What the models said for it

Verbatim evidence the judge attached to positive labels.

“Mid-sized teams looking for a more cost-effective alternative to Litmus with a strong focus on accessibility.” Gemini 3.5 Flash · Email deliverability · comparative prompt · alternative

“Email on Acid (~$99/mo) – for cross-client rendering previews and accessibility checks” Kimi K2 · Email deliverability · paraphrase prompt · alternative

“If your team prioritizes rendering over placement, consider Litmus as a close second.” Grok 4.1 Fast · Email deliverability · paraphrase prompt · alternative

“100+ client rendering, WCAG 2.2 accessibility, B2B/B2C spam analysis. ~$99/month.” Muse Glimmer 30B · Email deliverability · comparative prompt · alternative

And against it

Verbatim evidence attached to negative labels. A warning on a product with few labels is a warning; on a product with many, it is one voice among them.

“User sentiment includes reports of inaccurate renderings, occasional bugs and glitches.” Claude Haiku 4.5 · Email deliverability · negative prompt · soft negative

Named alongside

The products named in the same answers as Email on Acid, over the 40 answers that named it. Took the first choice instead counts the answers where the other product was the first choice and Email on Acid was named but was not.

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ProductSame answerTook the first choice insteadHead to head

Litmus37 of 401Not among the top eight

GlockApps35 of 4019Not among the top eight

Validity Everest27 of 408Not among the top eight

MXToolbox17 of 401Not among the top eight

Mailtrap17 of 401Not among the top eight

Google Postmaster Tools15 of 401Not among the top eight

Mail-Tester14 of 402Not among the top eight

MailReach12 of 400Not among the top eight

Microsoft SNDS11 of 400Not among the top eight

Folderly8 of 401Not among the top eight

A head-to-head page exists where both products are among a category's top eight. The other rows are the same fact without a page behind them, so they link to the product instead.

What carried it into the answer

The sites and pages cited by the answers that named Email on Acid. A fact about retrieval, not a lever on the model.

Citations exist only for the models that return a source list, five of the fourteen in this edition, so these counts come from 39 of the 40 answers that named Email on Acid and are not a share of its labels.

Domains cited

guideflow.com26

mailforge.ai18

prospeo.io18

instantly.ai16

mailflowauthority.com16

mailtrap.io15

salesdorado.com15

sender.net15

myemailverifier.com14

amplemarket.com13

166 of the 166 domain citations in answers naming Email on Acid came from somebody else's page.

Pages cited

guideflow.com/blog/email-testing-software24

instantly.ai/blog/email-deliverability-monitoring-tools15

mailforge.ai/blog/email-testing-tools15

myemailverifier.com/blog/email-deliverability-tools14

amplemarket.com/blog/best-email-deliverability-tools13

sender.net/blog/email-deliverability-tools13

mailflowauthority.com/email-deliverability/email-deliverability-testing12

salesdorado.com/en/inbound-marketing/email-testing-tools12

Pages are listed as the models cited them.

Search and answers

emailonacid.com is not in Google's top ten for any of the category's searches. In the answers, Email on Acid takes 0% of first choices and GlockApps takes 34%.

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In search

Google, US estimates

Position for “email deliverability tool”

–

not in the top ten

Position for “best email deliverability tool”

–

not in the top ten

Searches for its name, Google: 2,900 a month (“email on acid”)
AI search demand for its name, est.: 32 a month
Organic visits to its site: about 19,223 a month
Searches its site ranks for: 2,894 · 320 in the top three
Sites linking to it: 5,110
Paid Google search: No ads found in the estimate; that does not mean it runs none

Ads on Google

None found in Google's ad transparency records for the US

In answers

This edition

Share of first choices

rank 25 of 110 in email deliverability

Segment leader

34%

GlockApps

First choices: 0 across its categories
Named in: 40 answers
Its own site cited: in 39 of the answers that named it

Search figures are US estimates from DataForSEO, read October 5, 2026; AI search demand is its modeled, directional estimate, not a count of queries to any assistant. The answers are this edition's. Two measurements side by side: neither is read as the cause of the other.

What it publishes

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Addresses on emailonacid.com

859

subdomains included

Content

619

counted in the table below

Documentation

Product · Integration

0 · 0

Kind	Pages	Last 90 days	Latest	Categories named
Blog	532	0	2026-05-26	Mobile apps, SEO
Glossary or explainer	53	0	2024-08-01	CRM, CDP
Comparison	11	0	2023-07-27
Webinar or virtual event	10	0	2021-01-13
Case study	5	undated
Template or tool	5	0	2023-07-17
Report or ebook	1	undated
Podcast or video	1	0	2024-07-23
News or press	1	0	2019-10-02

Most recent

2026-05-26Email authentication protocols blog
2026-03-12History of email blog
2026-03-12History of email blog
2026-02-25Email rendering deliverability blog
2026-02-17A practical guide to using emojis in email blog
2026-02-05Valentines subject lines blog

How it is countedHide how it is counted

Every page emailonacid.com exposes, subdomains included. Kind is read from the address and title. The last 90 days, the latest date and the twelve months count pages by when they were published, from the site's feeds, a date in the address, or the page's own publication date, read from up to a hundred of its most recently changed pages; a page that says only when it last changed is counted in its kind but not in when, so the recent counts are a floor, and a kind none of whose pages gives a publication date reads undated. An event counts as online when its address or title says so (webinar, on demand, virtual or online summit); a conference, summit, trade show, expo or roadshow that does not say so is counted as a conference or event, which on a vendor's site is mostly in person. Read October 5, 2026.

Names read as Email on Acid

What the judge wrote, as written, with how often. The vendor table decides that these count as Email on Acid; a claim can dispute any of them.

Email on Acid (Mailgun Inspect) 1Email on Acid (by Sinch) 1Litmus/Email on Acid 1

Follow Email on Acid

An email the morning each edition publishes: where this product moved, where it held, and by how much against the noise floor. One address, confirmed by a click; a stop link in every email.

Already following? Everything you follow, with a stop for each.

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Claim this page

Claiming is free and changes nothing in the data. A claimed page shows a verified contact who is told when each edition publishes and when Email on Acid's standing changes by more than the noise floor; the right to propose corrections to the vendor table, meaning names the judge wrote that should or should not read as Email on Acid, applied by version and listed in the change log; and a one-line description supplied by the vendor and marked as such.

What a new claim receivesHide what a new claim receives

A new claim receives the current edition's vendor brief for Email on Acid by email, built from the raw record of the edition. It shows:

where Email on Acid is named, by buyer and by framing, and which cells hold its first choices;
the claims the models make when they name it, ranked, with the strongest and the weakest quoted;
its vocabulary against the segment leader's, and the pages the models cited;
who was chosen in the answers that did not name Email on Acid, and every reason the record gives;
a battlecard for each top rival: the head-to-head split, why they win, and the reservation quoted against them;
one page of published figures cleared to show a buyer.