September 2026 Edition, published · The permanent record of that edition, superseded since. The current standing is on the category page →
Index › GTM › GTM data and infrastructure › Email verification › Enterprise · September 2026 Edition

Email verification for enterprise buyers

Asked as “email verification service”, and as “email list validation tool”, on behalf of an enterprise B2B company. 47 first choices recorded across the direct, paraphrase, budget and scale prompts, twelve models each.
Standing · first-choice share
51%
Clear leader
51ZeroBounce06Hunter Email Verifier06NeverBounce36others

51% of first choices, clear leader.

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.

The standing

Share is the count of first choices across the direct, paraphrase, budget and scale prompts, over all twelve models, for an enterprise B2B company. Ordered by share.
ProductFirst-choice shareNegative rateLabelsQuadrant
01ZeroBounce51%0%57endorsed leader
02NeverBounce6%9%44accepted challenger
03Hunter Email Verifier6%24%21accepted challenger
04ZoomInfo6%0%10accepted challenger
05Kickbox4%3%32accepted challenger
06Bouncer4%9%33accepted challenger
Show the three products at 0%, ordered by negative rate
09BriteVerify0%27%11criticized challenger
08Clearout0%7%15accepted challenger
07Emailable0%5%20accepted challenger
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.
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

One product takes 51% of first choices here, so the chart would put eight markers in one corner and one at the far edge. The two measurements it plots are columns in the standing above: share, and the negative label rate. One product carries a negative rate above 25% in this category.

What they warned about

Seven of twelve models held their first choice under the paraphrase. Claude Haiku 4.5, DeepSeek V4 Flash, Llama 4 Maverick, GLM 4.7 FlashX and MiniMax M2.5 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.
Verifications.io
100%
5 of 5 labels negative · 5 of 12 models · 5 hard negative
“Avoid: Services with Severe Historical Red Flags ... Why avoid: In 2019, this service suffered one of the largest data breaches in history” DeepSeek V4 Flash, negative prompt
MillionVerifier
75%
6 of 8 labels negative · 4 of 12 models · 3 hard negative
“describe the company as a "shell company" with no real customer support ... this level of unreliability and non-responsiveness is unacceptable” DeepSeek V4 Flash, negative prompt
DeBounce
50%
4 of 8 labels negative · 4 of 12 models · 1 hard negative
“Popular budget services (such as *DeBounce*) are widely used for small projects but lack these critical certifications.” Gemini 3.5 Flash, negative prompt
Hunter Email Verifier
24%
5 of 21 labels negative · 4 of 12 models
“its per-email cost is significantly higher than dedicated verifiers ... too expensive for pure verification” Qwen 3.7 Flash, negative prompt

What they cite

Four of the twelve models returned a source list in this edition: four return the pages they cited.

Sites the answers cite

23 of 72 answers in this category came back with a source list, from 4 of 12 models: citations where the model returns them, or the search results it consulted. 333 links across 144 sites, every framing counted. Ranked by the number of answers carrying the site or page. The other 8 models searched through a gateway that returned no source list on this edition.

vendor site · ZeroBounce17 answers · 30 citations · 3 models
13 answers · 26 citations · 4 models
vendor site · Hunter10 answers · 11 citations · 3 models
vendor site · Overloop7 answers · 7 citations · 2 models
vendor site · ZoomInfo6 answers · 10 citations · 2 models
vendor site · Kickbox6 answers · 9 citations · 2 models
vendor site · Mailtrap6 answers · 6 citations · 3 models
vendor site · La Growth Machine5 answers · 6 citations · 2 models
vendor site · Clearout5 answers · 5 citations · 1 model
vendor site · Truelist4 answers · 6 citations · 2 models
vendor site · Prospeo4 answers · 5 citations · 2 models
vendor site · Cleanlist4 answers · 4 citations · 1 model

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.

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 verification service”, “email verification service”. 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 productsShareOwn site citedName searches, GoogleAI search demand, est.Organic visitsPaid search a month, est.Google ads, last 30 daysBest Google position
ZeroBounce zerobounce.net51%2509,90011838,183$7781202
NeverBounce neverbounce.com6%1558,1006473,30116
Hunter Email Verifier hunter.io6%465,4000152,78265
ZoomInfo zoominfo.com6%542135,0001,8106,376,738$1,140120
Kickbox kickbox.com4%14074,00015,51439,93631
Bouncer usebouncer.com4%12427,1006,6219,553246
BulkEmailChecker bulkemailchecker.com4%8
Unlimited Verifier unlimitedverifier.com4%2
Truelist truelist.io2%37
BillionVerify billionverify.com2%5

Google's top ten for the two searches hold 16 sites; 5 of them are among the sites the models cited here (hunter.io, mailtrap.io, truelist.io, usebouncer.com, zerobounce.net). The first result for “best email verification service” is reddit.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.
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ModelDirect“What is the best email verification service for an enterprise B2B company?”Paraphrase“Which email list validation tool would you recommend to a large B2B company with thousands of employees?”Comparative“What are the top enterprise-grade email verification services and how do they differ?”Budget-constrained“What is the best email verification service 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 verification service. What should we look at?”Negative“Which email verification services should a large enterprise avoid or be cautious about?”
Claude Haiku 4.5Skrapp
Three alternativesAllegrow, ZeroBounce, ZoomInfo
NeverBounce, ZeroBounceChanged
One alternativeMillionVerifier
no first choiceTruelist, Unlimited Verifierno first choicenothing named
GPT-5.4 miniZeroBounce
Two alternativesBouncer, Emailable
ZeroBounceHeld
One alternativeMailgun Validate
ZeroBounce
Three alternativesBouncer, BriteVerify, Hunter Email Verifier
ZeroBounceno first choiceagainst: Kickbox, MailTester, Xverify
Gemini 3.5 FlashZeroBounce
Three alternativesBouncer, BriteVerify, NeverBounce
ZeroBounceHeld
Two alternativesBouncer, NeverBounce
ZeroBounce
Five alternativesBouncer, BriteVerify, Emailable, Kickbox, NeverBounce
BulkEmailChecker, ZeroBounce
Three alternativesBouncer, Plauti Verify, Truelist
Kickbox
Two alternativesBriteVerify, ZeroBounce
against: DeBounce, Verifications.io
Perplexity SonarZeroBounce
Three alternativesBouncer, NeverBounce, ZoomInfo
ZeroBounceHeld
Two alternativesBouncer, ZoomInfo
ZeroBounce
Six alternativesBouncer, Clearout, Emailable, Hunter Email Verifier, Kickbox, NeverBounce
ZeroBounce
One alternativeEmailListVerify
against: Bouncer
no first choiceagainst: DeBounce, EmailListVerify, Emailable, Enrichley, Findymail, Lead Magic, MailerCheck, NeverBounce
Grok 4.20ZeroBounce
Five alternativesBouncer, Clearout, Hunter Email Verifier, Kickbox, NeverBounce
ZeroBounceHeld
Two alternativesKickbox, NeverBounce
against: Hunter Email Verifier
ZeroBounce
Three alternativesBouncer, Kickbox, NeverBounce
against: BriteVerify, Hunter Email Verifier
ZeroBounce
Three alternativesBulkEmailChecker, Kickbox, Truelist
against: Bouncer, NeverBounce
ZeroBounce
Two alternativesBouncer, Emailable
against: Clearout, DeBounce, Email List Validation, EmailListVerify, MillionVerifier, Verifications.io
Mistral SmallZoomInfo
Four alternativesAllegrow, Cognism, Kickbox, ZeroBounce
ZoomInfoHeld
Two alternativesNeverBounce, ZeroBounce
Bouncer, ZeroBounce
Five alternativesClearout, Emailable, Hunter Email Verifier, MillionVerifier, NeverBounce
BillionVerify
Two alternativesEmail List Validation, ZeroBounce
no first choicenothing named
DeepSeek V4 FlashHunter Email Verifier, ZeroBounce
Three alternativesClearout, Kickbox, NeverBounce
KickboxChanged
Two alternativesNeverBounce, ZeroBounce
NeverBounce, ZeroBounce
Three alternativesBouncer, Emailable, Kickbox
against: Hunter Email Verifier, MillionVerifier
BulkEmailChecker's Unlimited API
Two alternativesNeverBounce, ZeroBounce
ZeroBounce
One alternativeKickbox
against: DeBounce, MillionVerifier, NeverBounce
against: MillionVerifier, NeverBounce, Snov.io, Verifications.io
Llama 4 MaverickNeverBounce
Two alternativesZeroBounce, ZoomInfo
ZeroBounceChanged
Three alternativesBouncer, Cleanlist, Hunter Email Verifier
no first choiceZeroBounce
Two alternativesDeBounce, NeverBounce
no first choicenothing named
Qwen 3.7 FlashZeroBounce
Seven alternativesBriteVerify, Emailable, Hunter Email Verifier, Kickbox, NeverBounce, Prospeo, Puzzly
ZeroBounceHeld
Three alternativesKickbox, NeverBounce, Verifalia
ZeroBounce
Five alternativesBouncer, Clearout, Emailable, Kickbox, NeverBounce
Unlimited Verifier
Four alternativesBulkEmailChecker, Clearout, NeverBounce, ZeroBounce
no first choiceagainst: Apollo.io, Enrichley, Findymail, Hunter Email Verifier, Lead Magic, MailerCheck, Snov.io
Kimi K2ZeroBounce
Two alternativesKickbox, NeverBounce
ZeroBounceHeld
Two alternativesBouncer, Kickbox
ZeroBounce
Five alternativesBouncer, Clearout, Emailable, Kickbox, NeverBounce
against: BriteVerify
BulkEmailChecker, Hunter Email Verifier
Two alternativesKickbox, NeverBounce
against: Apollo.io
no first choice
Four alternativesBriteVerify, Kickbox, NeverBounce, ZeroBounce
against: Bouncer
against: EmailListVerify, HubSpot, Mailchimp, MillionVerifier, Verifications.io
GLM 4.7 FlashXZeroBounce
Three alternativesBouncer, Kickbox, NeverBounce
against: Hunter Email Verifier
BouncerChanged
Four alternativesEmailable, Kickbox, NeverBounce, ZeroBounce
NeverBounce
Six alternativesBouncer, Clearout, Emailable, Hunter Email Verifier, Kickbox, ZeroBounce
Bouncer
Two alternativesNeverBounce, ZeroBounce
against: MillionVerifier
no first choiceagainst: Verifications.io
MiniMax M2.5NeverBounce, ZeroBounce, ZoomInfo
One alternativeBouncer
Cleanlist, Hunter Email VerifierChanged
Two alternativesClearout, ZoomInfo
NeverBounce
Four alternativesClearout, Emailable, Kickbox, ZeroBounce
against: BriteVerify
BulkEmailChecker Unlimited API
Three alternativesMailValid, NeverBounce, ZeroBounce
no first choicenothing named
Bold 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.
Seventy-two rows: every prompt, every model, every answer.
PromptModelVersion stringTime (UTC)SearchedSourcesLatency
Direct recommendationClaude Haiku 4.5claude-haiku-4-5-202510012026-09-15 02:19yes68 s
Direct recommendationGPT-5.4 minigpt-5.4-mini-2026-03-172026-09-14 23:20yes45 s
Direct recommendationGemini 3.5 Flashgemini-3.5-flash2026-09-15 01:32yes2426 s
Direct recommendationPerplexity Sonarsonar2026-09-15 03:40yes206 s
Direct recommendationGrok 4.20spacexai/grok-4.1-fast-non-reasoning via vertex (asked for grok-4.20-non-reasoning; the API answered as this version)2026-09-15 03:47yes011 s
Direct recommendationMistral Smallmistral/mistral-small via mistral2026-09-15 00:47yes08 s
Direct recommendationDeepSeek V4 Flashdeepseek/deepseek-v4-flash via fireworks2026-09-15 02:29yes015 s
Direct recommendationLlama 4 Maverickmeta/llama-4-maverick via bedrock2026-09-15 00:34yes01 s
Direct recommendationQwen 3.7 Flashalibaba/qwen3.7-flash via alibaba2026-09-15 04:16yes031 s
Direct recommendationKimi K2moonshotai/kimi-k2 via novita2026-09-15 03:28yes033 s
Direct recommendationGLM 4.7 FlashXzai/glm-4.7-flashx via zai2026-09-14 23:33yes034 s
Direct recommendationMiniMax M2.5minimax/minimax-m2.5 via minimax2026-09-14 23:38yes020 s
ParaphraseClaude Haiku 4.5claude-haiku-4-5-202510012026-09-14 22:53yes88 s
ParaphraseGPT-5.4 minigpt-5.4-mini-2026-03-172026-09-15 05:03yes27 s
ParaphraseGemini 3.5 Flashgemini-3.5-flash2026-09-14 23:17yes1019 s
ParaphrasePerplexity Sonarsonar2026-09-15 00:38yes205 s
ParaphraseGrok 4.20spacexai/grok-4.1-fast-non-reasoning via vertex (asked for grok-4.20-non-reasoning; the API answered as this version)2026-09-15 01:54yes09 s
ParaphraseMistral Smallmistral/mistral-small via mistral2026-09-15 00:58yes08 s
ParaphraseDeepSeek V4 Flashdeepseek/deepseek-v4-flash via deepinfra2026-09-14 23:10yes036 s
ParaphraseLlama 4 Maverickmeta/llama-4-maverick via bedrock2026-09-15 02:55yes02 s
ParaphraseQwen 3.7 Flashalibaba/qwen3.7-flash via alibaba2026-09-15 01:39no039 s
ParaphraseKimi K2moonshotai/kimi-k2 via novita2026-09-14 23:23yes033 s
ParaphraseGLM 4.7 FlashXzai/glm-4.7-flashx via zai2026-09-15 00:04yes034 s
ParaphraseMiniMax M2.5minimax/minimax-m2.5 via minimax2026-09-15 01:57yes014 s
ComparativeClaude Haiku 4.5claude-haiku-4-5-202510012026-09-15 01:30yes69 s
ComparativeGPT-5.4 minigpt-5.4-mini-2026-03-172026-09-14 23:56yes914 s
ComparativeGemini 3.5 Flashgemini-3.5-flash2026-09-15 04:14yes2928 s
ComparativePerplexity Sonarsonar2026-09-15 01:12yes2011 s
ComparativeGrok 4.20spacexai/grok-4.1-fast-non-reasoning via vertex (asked for grok-4.20-non-reasoning; the API answered as this version)2026-09-15 03:21yes08 s
ComparativeMistral Smallmistral/mistral-small via mistral2026-09-15 01:47yes09 s
ComparativeDeepSeek V4 Flashdeepseek/deepseek-v4-flash via fireworks2026-09-15 00:47yes032 s
ComparativeLlama 4 Maverickmeta/llama-4-maverick via bedrock2026-09-15 00:15yes01 s
ComparativeQwen 3.7 Flashalibaba/qwen3.7-flash via alibaba2026-09-15 04:33yes036 s
ComparativeKimi K2moonshotai/kimi-k2 via novita2026-09-15 01:16yes096 s
ComparativeGLM 4.7 FlashXzai/glm-4.7-flashx via zai2026-09-15 01:37yes066 s
ComparativeMiniMax M2.5minimax/minimax-m2.5 via minimax2026-09-15 01:36yes011 s
Budget constrainedClaude Haiku 4.5claude-haiku-4-5-202510012026-09-15 03:32yes158 s
Budget constrainedGPT-5.4 minigpt-5.4-mini-2026-03-172026-09-15 04:19yes29 s
Budget constrainedGemini 3.5 Flashgemini-3.5-flash2026-09-15 00:18yes1929 s
Budget constrainedPerplexity Sonarsonar2026-09-15 04:35yes205 s
Budget constrainedGrok 4.20spacexai/grok-4.1-fast-non-reasoning via vertex (asked for grok-4.20-non-reasoning; the API answered as this version)2026-09-15 04:36yes018 s
Budget constrainedMistral Smallmistral/mistral-small via mistral2026-09-15 03:23yes07 s
Budget constrainedDeepSeek V4 Flashdeepseek/deepseek-v4-flash via deepinfra2026-09-15 04:48yes028 s
Budget constrainedLlama 4 Maverickmeta/llama-4-maverick via bedrock2026-09-14 23:37yes02 s
Budget constrainedQwen 3.7 Flashalibaba/qwen3.7-flash via alibaba2026-09-15 01:58yes033 s
Budget constrainedKimi K2moonshotai/kimi-k2 via novita2026-09-15 04:23yes039 s
Budget constrainedGLM 4.7 FlashXzai/glm-4.7-flashx via zai2026-09-15 00:45yes017 s
Budget constrainedMiniMax M2.5minimax/minimax-m2.5 via minimax2026-09-15 00:40yes035 s
Scale constrainedClaude Haiku 4.5claude-haiku-4-5-202510012026-09-15 01:09yes1511 s
Scale constrainedGPT-5.4 minigpt-5.4-mini-2026-03-172026-09-15 00:14no09 s
Scale constrainedGemini 3.5 Flashgemini-3.5-flash2026-09-14 23:59yes1730 s
Scale constrainedPerplexity Sonarsonar2026-09-15 00:32yes2012 s
Scale constrainedGrok 4.20spacexai/grok-4.1-fast-non-reasoning via vertex (asked for grok-4.20-non-reasoning; the API answered as this version)2026-09-15 03:27yes07 s
Scale constrainedMistral Smallmistral/mistral-small via mistral2026-09-15 03:40no09 s
Scale constrainedDeepSeek V4 Flashdeepseek/deepseek-v4-flash via deepinfra2026-09-14 22:59yes087 s
Scale constrainedLlama 4 Maverickmeta/llama-4-maverick via bedrock2026-09-15 01:04yes03 s
Scale constrainedQwen 3.7 Flashalibaba/qwen3.7-flash via alibaba2026-09-14 23:46no028 s
Scale constrainedKimi K2moonshotai/kimi-k2 via novita2026-09-15 03:20yes046 s
Scale constrainedGLM 4.7 FlashXzai/glm-4.7-flashx via zai2026-09-15 03:46yes088 s
Scale constrainedMiniMax M2.5minimax/minimax-m2.5 via minimax2026-09-15 02:22yes016 s
Negative framingClaude Haiku 4.5claude-haiku-4-5-202510012026-09-15 02:05yes2411 s
Negative framingGPT-5.4 minigpt-5.4-mini-2026-03-172026-09-15 04:08yes411 s
Negative framingGemini 3.5 Flashgemini-3.5-flash2026-09-14 22:52yes1926 s
Negative framingPerplexity Sonarsonar2026-09-14 23:40yes206 s
Negative framingGrok 4.20spacexai/grok-4.1-fast-non-reasoning via vertex (asked for grok-4.20-non-reasoning; the API answered as this version)2026-09-15 00:37yes010 s
Negative framingMistral Smallmistral/mistral-small via mistral2026-09-15 00:29yes012 s
Negative framingDeepSeek V4 Flashdeepseek/deepseek-v4-flash via deepinfra2026-09-15 00:09yes059 s
Negative framingLlama 4 Maverickmeta/llama-4-maverick via bedrock2026-09-15 03:50yes01 s
Negative framingQwen 3.7 Flashalibaba/qwen3.7-flash via alibaba2026-09-15 01:47yes038 s
Negative framingKimi K2moonshotai/kimi-k2 via novita2026-09-15 04:52yes053 s
Negative framingGLM 4.7 FlashXzai/glm-4.7-flashx via zai2026-09-14 22:52yes019 s
Negative framingMiniMax M2.5minimax/minimax-m2.5 via minimax2026-09-15 04:09yes022 s

Normalization in this category

Every judgment call made between the raw labels and the numbers above, listed so it is visible and reversible.

ShowHide
Category-scoped readings
Bulk Email Checker read as BulkEmailChecker
Hunter read as Hunter Email Verifier
Hunter (Email Verification) read as Hunter Email Verifier
Hunter (Email Verifier) read as Hunter Email Verifier
Hunter.io read as Hunter Email Verifier
Unresolved, counted raw
BulkEmailChecker Unlimited API
BulkEmailChecker's Unlimited API
DataCaptive
Emaillistchecker
MailValid
Plauti Verify
Puzzly
Discontinued, still offered
No shut-down product was recommended here.
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