Index › 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

ZeroBounce

Clear leader

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.

Small business

Bouncer33%ContestedStanding →Mid-market

ZeroBounce29%ContestedStanding →Enterprise

ZeroBounce51%Clear leaderThis page

01The 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

ZeroBounce0%57endorsed leader

NeverBounce9%44accepted challenger

Hunter24%21accepted challenger

ZoomInfo0%10accepted challenger

Kickbox3%32accepted challenger

Bouncer9%33accepted challenger

Show the three products at 0%, ordered by negative rate

BriteVerify30%10criticized challenger

Clearout7%15accepted challenger

Emailable5%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 vendor page.

Head to head

ZeroBounce vs Bouncer ZeroBounce vs Hunter Bouncer vs Hunter

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. Jump to the standing

02What 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

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

03What they cite

Citations exist only for the models that return a source list: four of the twelve in this edition, and all six flagship models on the expanded tier.

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. 6 of those lists are Google grounding redirects that name no site and are left out of the counts. 215 links across 99 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.

zerobounce.net

vendor site · ZeroBounce11 answers · 18 citations · 2 models

hunter.io

vendor site · Hunter9 answers · 10 citations · 2 models

usebouncer.com

8 answers · 17 citations · 3 models

pipeline.zoominfo.com

vendor site · ZoomInfo6 answers · 10 citations · 2 models

overloop.com

vendor site · Overloop6 answers · 6 citations · 1 model

lagrowthmachine.com

vendor site · La Growth Machine5 answers · 6 citations · 2 models

clearout.io

vendor site · Clearout5 answers · 5 citations · 1 model

cleanlist.ai

vendor site · Cleanlist4 answers · 4 citations · 1 model

learn.g2.com

4 answers · 4 citations · 2 models

mailtrap.io

vendor site · Mailtrap4 answers · 4 citations · 2 models

snov.io

vendor site · Snov.io4 answers · 4 citations · 2 models

g2.com

3 answers · 4 citations · 3 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.

hunter.io/email-verification-guide/best-email-verifiers

8 answers · 2 models

overloop.com/blog/email-verification-guide

6 answers · 1 model

pipeline.zoominfo.com/marketing/email-verification-tools

5 answers · 2 models

zerobounce.net/

5 answers · 1 model

clearout.io/email-verification-tools

4 answers · 1 model

learn.g2.com/best-email-verification-software

4 answers · 2 models

mailtrap.io/blog/email-verification-tools

4 answers · 2 models

pipeline.zoominfo.com/operations/email-finder-verification-tools

4 answers · 2 models

usebouncer.com/best-email-verification-tools

4 answers · 2 models

usebouncer.com/email-list-verification-service

4 answers · 1 model

04How 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.

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 alternatives

Allegrow, ZeroBounce, ZoomInfo

NeverBounce, ZeroBounceChanged

One alternative

MillionVerifier

no first choiceTruelist, Unlimited Verifierno first choicenothing named

GPT-5.4 miniZeroBounce

Two alternatives

Bouncer, Emailable

ZeroBounceHeld

One alternative

Mailgun Validate

ZeroBounce

Three alternatives

Bouncer, BriteVerify / Validity Verify, Hunter

ZeroBounceno first choiceagainst: Kickbox, MailTester, Xverify

Gemini 3.5 FlashZeroBounce

Three alternatives

Bouncer, BriteVerify, NeverBounce

ZeroBounceHeld

Two alternatives

Bouncer, NeverBounce

ZeroBounce

Five alternatives

Bouncer, BriteVerify, Emailable, Kickbox, NeverBounce

Bulk Email Checker, ZeroBounce

Three alternatives

Bouncer, Plauti Verify, Truelist

Kickbox

Two alternatives

BriteVerify, ZeroBounce

against: DeBounce, Verifications.io

Perplexity SonarZeroBounce

Three alternatives

Bouncer, NeverBounce, ZoomInfo

ZeroBounceHeld

Two alternatives

Bouncer, ZoomInfo

ZeroBounce

Six alternatives

Bouncer, Clearout, Emailable, Hunter, Kickbox, NeverBounce

ZeroBounce

One alternative

EmailListVerify

against: Bouncerno first choiceagainst: DeBounce, Email List Verify, Emailable, Enrichley, Findymail, Lead Magic, MailerCheck, NeverBounce

Grok 4.1 FastZeroBounce

Five alternatives

Bouncer, Clearout, Hunter, Kickbox, NeverBounce

ZeroBounceHeld

Two alternatives

Kickbox, NeverBounce

against: HunterZeroBounce

Three alternatives

Bouncer, Kickbox, NeverBounce

against: BriteVerify, HunterZeroBounce

Three alternatives

BulkEmailChecker, Kickbox, Truelist

against: Bouncer, NeverBounceZeroBounce

Two alternatives

Bouncer, Emailable

against: Clearout, DeBounce, Email List Validation, EmailListVerify, MillionVerifier, Verifications.io

Mistral SmallZoomInfo

Four alternatives

Allegrow, Cognism, Kickbox, ZeroBounce

ZoomInfoHeld

Two alternatives

NeverBounce, ZeroBounce

Bouncer, ZeroBounce

Five alternatives

Clearout, Emailable, Hunter, MillionVerifier, NeverBounce

BillionVerify

Two alternatives

EmailListValidation, ZeroBounce

no first choicenothing named

DeepSeek V4 FlashHunter, ZeroBounce

Three alternatives

Clearout, Kickbox, NeverBounce

KickboxChanged

Two alternatives

NeverBounce, ZeroBounce

Three alternatives

Bouncer, Emailable, Kickbox

against: Hunter, MillionVerifierBulkEmailChecker's Unlimited API

Two alternatives

NeverBounce, ZeroBounce

ZeroBounce

One alternative

Kickbox

against: DeBounce, MillionVerifier, NeverBounceagainst: MillionVerifier, NeverBounce, Snov.io, Verifications.io

Llama 4 MaverickNeverBounce

Two alternatives

ZeroBounce, ZoomInfo

ZeroBounceChanged

Three alternatives

Bouncer, Cleanlist, Hunter

no first choiceZeroBounce

Two alternatives

DeBounce, NeverBounce

no first choicenothing named

Qwen 3.7 FlashZeroBounce

Seven alternatives

BriteVerify, Emailable, Hunter, Kickbox, NeverBounce, Prospeo, Puzzly

ZeroBounceHeld

Three alternatives

Kickbox, NeverBounce, Verifalia

ZeroBounce

Five alternatives

Bouncer, Clearout, Emailable, Kickbox, NeverBounce

Unlimited Verifier

Four alternatives

BulkEmailChecker, Clearout, NeverBounce, ZeroBounce

no first choiceagainst: Apollo.io, Enrichley, Findymail, Hunter, Lead Magic, MailerCheck, Snov.io

Kimi K2ZeroBounce

Two alternatives

Kickbox, NeverBounce

ZeroBounceHeld

Two alternatives

Bouncer, Kickbox

ZeroBounce

Five alternatives

Bouncer, Clearout, Emailable, Kickbox, NeverBounce

against: BriteVerifyBulk Email Checker, Hunter

Two alternatives

Kickbox, NeverBounce

against: Apollo.iono first choice

Four alternatives

BriteVerify, Kickbox, NeverBounce, ZeroBounce

against: Bounceragainst: EmailListVerify, HubSpot, Mailchimp, MillionVerifier, Verifications.io

GLM 4.7 FlashXZeroBounce

Three alternatives

Bouncer, Kickbox, NeverBounce

against: HunterBouncerChanged

Four alternatives

Emailable, Kickbox, NeverBounce, ZeroBounce

NeverBounce

Six alternatives

Bouncer, Clearout, Emailable, Hunter, Kickbox, ZeroBounce

Bouncer

Two alternatives

NeverBounce, ZeroBounce

against: MillionVerifierno first choiceagainst: Verifications.io

MiniMax M2.5NeverBounce, ZeroBounce, ZoomInfo

One alternative

Bouncer

Cleanlist, HunterChanged

Two alternatives

Clearout, ZoomInfo

NeverBounce

Four alternatives

Clearout, Emailable, Kickbox, ZeroBounce

against: BriteVerifyBulkEmailChecker Unlimited API

Three alternatives

MailValid, NeverBounce, ZeroBounce

no first choicenothing named

Bold is the first choiceAlternatives are counted; the count opens them.What the answer argued against

05The record

One row per call: the version string exactly as returned, whether the model searched, sources cited, and latency. Full answer text is in the free responses file. Download the record

Seventy-two 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`	2026-09-15 02:19	yes	6	8 s
Direct recommendation	GPT-5.4 mini	`gpt-5.4-mini-2026-03-17`	2026-09-14 23:20	yes	4	5 s
Direct recommendation	Gemini 3.5 Flash	`gemini-3.5-flash`	2026-09-15 01:32	yes	24	26 s
Direct recommendation	Perplexity Sonar	`sonar`	2026-09-15 03:40	yes	20	6 s
Direct recommendation	Grok 4.1 Fast	`spacexai/grok-4.1-fast-non-reasoning via vertex`	2026-09-15 03:47	yes	0	11 s
Direct recommendation	Mistral Small	`mistral/mistral-small via mistral`	2026-09-15 00:47	yes	0	8 s
Direct recommendation	DeepSeek V4 Flash	`deepseek/deepseek-v4-flash via fireworks`	2026-09-15 02:29	yes	0	15 s
Direct recommendation	Llama 4 Maverick	`meta/llama-4-maverick via bedrock`	2026-09-15 00:34	yes	0	1 s
Direct recommendation	Qwen 3.7 Flash	`alibaba/qwen3.7-flash via alibaba`	2026-09-15 04:16	yes	0	31 s
Direct recommendation	Kimi K2	`moonshotai/kimi-k2 via novita`	2026-09-15 03:28	yes	0	33 s
Direct recommendation	GLM 4.7 FlashX	`zai/glm-4.7-flashx via zai`	2026-09-14 23:33	yes	0	34 s
Direct recommendation	MiniMax M2.5	`minimax/minimax-m2.5 via minimax`	2026-09-14 23:38	yes	0	20 s
Paraphrase	Claude Haiku 4.5	`claude-haiku-4-5-20251001`	2026-09-14 22:53	yes	8	8 s
Paraphrase	GPT-5.4 mini	`gpt-5.4-mini-2026-03-17`	2026-09-15 05:03	yes	2	7 s
Paraphrase	Gemini 3.5 Flash	`gemini-3.5-flash`	2026-09-14 23:17	yes	10	19 s
Paraphrase	Perplexity Sonar	`sonar`	2026-09-15 00:38	yes	20	5 s
Paraphrase	Grok 4.1 Fast	`spacexai/grok-4.1-fast-non-reasoning via vertex`	2026-09-15 01:54	yes	0	9 s
Paraphrase	Mistral Small	`mistral/mistral-small via mistral`	2026-09-15 00:58	yes	0	8 s
Paraphrase	DeepSeek V4 Flash	`deepseek/deepseek-v4-flash via deepinfra`	2026-09-14 23:10	yes	0	36 s
Paraphrase	Llama 4 Maverick	`meta/llama-4-maverick via bedrock`	2026-09-15 02:55	yes	0	2 s
Paraphrase	Qwen 3.7 Flash	`alibaba/qwen3.7-flash via alibaba`	2026-09-15 01:39	no	0	39 s
Paraphrase	Kimi K2	`moonshotai/kimi-k2 via novita`	2026-09-14 23:23	yes	0	33 s
Paraphrase	GLM 4.7 FlashX	`zai/glm-4.7-flashx via zai`	2026-09-15 00:04	yes	0	34 s
Paraphrase	MiniMax M2.5	`minimax/minimax-m2.5 via minimax`	2026-09-15 01:57	yes	0	14 s
Comparative	Claude Haiku 4.5	`claude-haiku-4-5-20251001`	2026-09-15 01:30	yes	6	9 s
Comparative	GPT-5.4 mini	`gpt-5.4-mini-2026-03-17`	2026-09-14 23:56	yes	9	14 s
Comparative	Gemini 3.5 Flash	`gemini-3.5-flash`	2026-09-15 04:14	yes	29	28 s
Comparative	Perplexity Sonar	`sonar`	2026-09-15 01:12	yes	20	11 s
Comparative	Grok 4.1 Fast	`spacexai/grok-4.1-fast-non-reasoning via vertex`	2026-09-15 03:21	yes	0	8 s
Comparative	Mistral Small	`mistral/mistral-small via mistral`	2026-09-15 01:47	yes	0	9 s
Comparative	DeepSeek V4 Flash	`deepseek/deepseek-v4-flash via fireworks`	2026-09-15 00:47	yes	0	32 s
Comparative	Llama 4 Maverick	`meta/llama-4-maverick via bedrock`	2026-09-15 00:15	yes	0	1 s
Comparative	Qwen 3.7 Flash	`alibaba/qwen3.7-flash via alibaba`	2026-09-15 04:33	yes	0	36 s
Comparative	Kimi K2	`moonshotai/kimi-k2 via novita`	2026-09-15 01:16	yes	0	96 s
Comparative	GLM 4.7 FlashX	`zai/glm-4.7-flashx via zai`	2026-09-15 01:37	yes	0	66 s
Comparative	MiniMax M2.5	`minimax/minimax-m2.5 via minimax`	2026-09-15 01:36	yes	0	11 s
Budget constrained	Claude Haiku 4.5	`claude-haiku-4-5-20251001`	2026-09-15 03:32	yes	15	8 s
Budget constrained	GPT-5.4 mini	`gpt-5.4-mini-2026-03-17`	2026-09-15 04:19	yes	2	9 s
Budget constrained	Gemini 3.5 Flash	`gemini-3.5-flash`	2026-09-15 00:18	yes	19	29 s
Budget constrained	Perplexity Sonar	`sonar`	2026-09-15 04:35	yes	20	5 s
Budget constrained	Grok 4.1 Fast	`spacexai/grok-4.1-fast-non-reasoning via vertex`	2026-09-15 04:36	yes	0	18 s
Budget constrained	Mistral Small	`mistral/mistral-small via mistral`	2026-09-15 03:23	yes	0	7 s
Budget constrained	DeepSeek V4 Flash	`deepseek/deepseek-v4-flash via deepinfra`	2026-09-15 04:48	yes	0	28 s
Budget constrained	Llama 4 Maverick	`meta/llama-4-maverick via bedrock`	2026-09-14 23:37	yes	0	2 s
Budget constrained	Qwen 3.7 Flash	`alibaba/qwen3.7-flash via alibaba`	2026-09-15 01:58	yes	0	33 s
Budget constrained	Kimi K2	`moonshotai/kimi-k2 via novita`	2026-09-15 04:23	yes	0	39 s
Budget constrained	GLM 4.7 FlashX	`zai/glm-4.7-flashx via zai`	2026-09-15 00:45	yes	0	17 s
Budget constrained	MiniMax M2.5	`minimax/minimax-m2.5 via minimax`	2026-09-15 00:40	yes	0	35 s
Scale constrained	Claude Haiku 4.5	`claude-haiku-4-5-20251001`	2026-09-15 01:09	yes	15	11 s
Scale constrained	GPT-5.4 mini	`gpt-5.4-mini-2026-03-17`	2026-09-15 00:14	no	0	9 s
Scale constrained	Gemini 3.5 Flash	`gemini-3.5-flash`	2026-09-14 23:59	yes	17	30 s
Scale constrained	Perplexity Sonar	`sonar`	2026-09-15 00:32	yes	20	12 s
Scale constrained	Grok 4.1 Fast	`spacexai/grok-4.1-fast-non-reasoning via vertex`	2026-09-15 03:27	yes	0	7 s
Scale constrained	Mistral Small	`mistral/mistral-small via mistral`	2026-09-15 03:40	no	0	9 s
Scale constrained	DeepSeek V4 Flash	`deepseek/deepseek-v4-flash via deepinfra`	2026-09-14 22:59	yes	0	87 s
Scale constrained	Llama 4 Maverick	`meta/llama-4-maverick via bedrock`	2026-09-15 01:04	yes	0	3 s
Scale constrained	Qwen 3.7 Flash	`alibaba/qwen3.7-flash via alibaba`	2026-09-14 23:46	no	0	28 s
Scale constrained	Kimi K2	`moonshotai/kimi-k2 via novita`	2026-09-15 03:20	yes	0	46 s
Scale constrained	GLM 4.7 FlashX	`zai/glm-4.7-flashx via zai`	2026-09-15 03:46	yes	0	88 s
Scale constrained	MiniMax M2.5	`minimax/minimax-m2.5 via minimax`	2026-09-15 02:22	yes	0	16 s
Negative framing	Claude Haiku 4.5	`claude-haiku-4-5-20251001`	2026-09-15 02:05	yes	24	11 s
Negative framing	GPT-5.4 mini	`gpt-5.4-mini-2026-03-17`	2026-09-15 04:08	yes	4	11 s
Negative framing	Gemini 3.5 Flash	`gemini-3.5-flash`	2026-09-14 22:52	yes	19	26 s
Negative framing	Perplexity Sonar	`sonar`	2026-09-14 23:40	yes	20	6 s
Negative framing	Grok 4.1 Fast	`spacexai/grok-4.1-fast-non-reasoning via vertex`	2026-09-15 00:37	yes	0	10 s
Negative framing	Mistral Small	`mistral/mistral-small via mistral`	2026-09-15 00:29	yes	0	12 s
Negative framing	DeepSeek V4 Flash	`deepseek/deepseek-v4-flash via deepinfra`	2026-09-15 00:09	yes	0	59 s
Negative framing	Llama 4 Maverick	`meta/llama-4-maverick via bedrock`	2026-09-15 03:50	yes	0	1 s
Negative framing	Qwen 3.7 Flash	`alibaba/qwen3.7-flash via alibaba`	2026-09-15 01:47	yes	0	38 s
Negative framing	Kimi K2	`moonshotai/kimi-k2 via novita`	2026-09-15 04:52	yes	0	53 s
Negative framing	GLM 4.7 FlashX	`zai/glm-4.7-flashx via zai`	2026-09-14 22:52	yes	0	19 s
Negative framing	MiniMax M2.5	`minimax/minimax-m2.5 via minimax`	2026-09-15 04:09	yes	0	22 s

Normalization in this category

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

Category-scoped readings

None. Every name in this category resolved on its own.

Unresolved, counted raw

BriteVerify / Validity Verify

BulkEmailChecker Unlimited API

BulkEmailChecker's Unlimited API

DataCaptive

Email List Verify

EmailListValidation

Emaillistchecker

MailValid

Mailgun Validate

Plauti Verify

Puzzly

Discontinued, still offered

No shut-down product was recommended here.

Email verification for enterprise buyers

By buyer segment

01The standing

02What they warned about

03What they cite

Sites the answers cite

Pages the answers cite

04How they answered

05The record

Normalization in this category

Also in gtm data and infrastructure