Index › GTM data and infrastructure › Email verification › Small business › September 2026 Edition

Email verification for small business buyers

Asked as “email verification service”, and as “email list validation tool”, on behalf of a small B2B company. 45 first choices recorded across the direct, paraphrase, budget and scale prompts, twelve models each.

Standing

Bouncer

Contested

33% of first choices, contested.

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%ContestedThis page Mid-market

ZeroBounce29%ContestedStanding →Enterprise

ZeroBounce51%Clear leaderStanding →

01The standing

Share is the count of first choices across the direct, paraphrase, budget and scale prompts, over all twelve models, for a small B2B company. Ordered by share.

ProductFirst-choice shareNegative rateLabelsQuadrant

Bouncer2%41endorsed leader

Hunter7%41accepted challenger

ZeroBounce13%53accepted challenger

Clearout3%33accepted challenger

Kickbox4%28accepted challenger

EmailListVerify12%24accepted challenger

NeverBounce21%34accepted challenger

MillionVerifier44%16criticized challenger

DeBounce4%23accepted challenger

Show the one product at 0%, ordered by negative rate

Emailable0%25accepted 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

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 →

Accepted challengerEndorsed leader

0%First-choice share → · lines at 30% share and 25% negative50%

Key

Bouncer33%

Hunter13%

ZeroBounce7%

Clearout4%

Kickbox4%

EmailListVerify4%

NeverBounce4%

MillionVerifier4%

DeBounce2%

Emailable0%

02What they warned about

Two of twelve models held their first choice under the paraphrase. Claude Haiku 4.5, GPT-5.4 mini, Gemini 3.5 Flash, Grok 4.1 Fast, Mistral Small, DeepSeek V4 Flash, Llama 4 Maverick, Qwen 3.7 Flash, 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.

MillionVerifier

44%

7 of 16 labels negative · 7 of 12 models · 3 hard negative

“Companies like **MillionVerifier** have drawn criticism for lost bounces and unhelpful support after problems.” DeepSeek V4 Flash, negative prompt

NeverBounce

21%

7 of 34 labels negative · 5 of 12 models · 3 hard negative

“NeverBounce — Post-Acquisition Issues ... Price increases: Users report prices rose by up to 300% after the acquisition” MiniMax M2.5, negative prompt

ZeroBounce

13%

7 of 53 labels negative · 5 of 12 models

“Downside: It is more expensive than Bouncer or BounceBan, and you are partially paying for extra deliverability features you may not use” Gemini 3.5 Flash, direct prompt

EmailMarker

100%

3 of 3 labels negative · 3 of 12 models · 2 hard negative

“Avoid EmailMarker — the 74% accuracy isn't worth any price” Kimi K2, 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

20 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. 5 of those lists are Google grounding redirects that name no site and are left out of the counts. 188 links across 65 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.

usebouncer.com

11 answers · 26 citations · 3 models

zerobounce.net

vendor site · ZeroBounce11 answers · 14 citations · 3 models

hunter.io

vendor site · Hunter9 answers · 9 citations · 3 models

mailtrap.io

vendor site · Mailtrap9 answers · 9 citations · 2 models

emailvendorselection.com

7 answers · 7 citations · 2 models

pipeline.zoominfo.com

vendor site · ZoomInfo6 answers · 11 citations · 2 models

overloop.com

vendor site · Overloop6 answers · 6 citations · 1 model

clearout.io

vendor site · Clearout5 answers · 6 citations · 2 models

g2.com

5 answers · 6 citations · 3 models

reddit.com

vendor site · Reddit4 answers · 8 citations · 1 model

sender.net

vendor site · Sender4 answers · 5 citations · 1 model

myemailverifier.com

vendor site · MyEmailVerifier4 answers · 4 citations · 2 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.

mailtrap.io/blog/email-verification-tools

9 answers · 2 models

emailvendorselection.com/email-verification-tools

7 answers · 2 models

usebouncer.com/best-email-verification-tools

7 answers · 3 models

zerobounce.net/

7 answers · 2 models

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

6 answers · 2 models

overloop.com/blog/email-verification-guide

6 answers · 1 model

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

6 answers · 2 models

g2.com/categories/email-verification/small-business

5 answers · 3 models

clearout.io/email-verification-tools

4 answers · 1 model

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

4 answers · 2 models

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 a small B2B company?”Paraphrase“Which email list validation tool would you recommend to a small business that sells to other businesses?”Comparative“What are the top email verification services for a small team and how do they differ?”Budget-constrained“What is the best email verification service for a small company with a tight budget?”Scale-constrained“We are a 30 person company evaluating an email verification service. What should we look at?”Negative“Which email verification services should a small business avoid or be cautious about?”

Claude Haiku 4.5Bouncer

Three alternatives

Hunter.io Email Verifier, NeverBounce, ZeroBounce

NeverBounce, SkrappChanged

One alternative

Listmint

Bouncer

Five alternatives

Emailable, MailerCheck, Mailfloss, QuickEmailVerification, ZeroBounce

QuickEmailVerification, Reoon

Three alternatives

Pabbly, Proofy.io, VerifiedEmail

no first choiceagainst: BriteVerify, EmailVerify.io, NeverBounce, VerifiedEmail

GPT-5.4 miniHunter

One alternative

ZeroBounce

NeverBounce, ZeroBounceChanged

Three alternatives

BriteVerify, Hunter Email Verifier, Kickbox

Clearout, Emailable

Three alternatives

Kickbox, NeverBounce, ZeroBounce

Bouncer

Two alternatives

Hunter, ZeroBounce

no first choicenothing named

Gemini 3.5 FlashBouncer

Three alternatives

Apollo.io, BounceBan, Hunter

against: ZeroBounceBounceBan, BouncerChanged

One alternative

Hunter

Bouncer

One alternative

DeBounce

against: MillionVerifier, NeverBounce, ZeroBounceBillionVerify

Three alternatives

Bouncer, DeBounce, MillionVerifier

no first choiceagainst: Hunter, Kickbox, NeverBounce, QuickEmailVerification, Snov.io, Verifalia, VoilaNorbert, ZeroBounce

Perplexity SonarBouncer

Four alternatives

EmailListVerify, Emailable, Hunter, ZeroBounce

BouncerHeld

Five alternatives

Clearout, Hunter, NeverBounce, Skrapp, ZeroBounce

Bouncer

Six alternatives

Clearout, DeBounce, Emailable, Hunter, NeverBounce, ZeroBounce

Bouncer

Four alternatives

DeBounce, EmailListVerify, Emailable, Hunter

no first choicenothing named

Grok 4.1 FastZeroBounce

Two alternatives

Bouncer, Hunter

against: DeBounce, EmailListVerifyBouncerChanged

Two alternatives

Hunter, ZeroBounce

against: EmailListVerifyBouncer, Kickbox

Four alternatives

DeBounce, Emailable, NeverBounce, ZeroBounce

against: ZoomInfoEmailListVerify, MyEmailVerifier

Two alternatives

Hunter Email Verifier, ZeroBounce

against: EmailMarker, VerifiedEmailBouncer

Two alternatives

Emailable, ZeroBounce

against: Mails.so, MillionVerifier, Snov.io, ZeroBounce

Mistral SmallBouncer

Four alternatives

Clearout, Hunter, NeverBounce, ZeroBounce

HunterChanged

Four alternatives

Clearout, Emailable, NeverBounce, ZeroBounce

Bouncer, EmailListVerify

Four alternatives

Clearout, Emailable, NeverBounce, ZeroBounce

against: HunterBouncer

Two alternatives

DeBounce, ZeroBounce

no first choice

Nine alternatives

Bouncer, Clearout, DeBounce, EmailListVerify, Hunter, Kickbox, NeverBounce, Xverify, ZeroBounce

against: EmailMarker, Mails.so, MillionVerifier, NeverBounce

DeepSeek V4 FlashBouncer

Five alternatives

DeBounce, Hunter, Kickbox, MillionVerifier, ZeroBounce

HunterChanged

Three alternatives

Clearout, MillionVerifier, ZeroBounce

against: Apollo.io, NeverBounceBouncer

Six alternatives

DeBounce, EmailListVerify, Hunter, Kickbox, NeverBounce, ZeroBounce

MillionVerifier

Two alternatives

DeBounce, EmailListVerify

against: Bouncer, Clearout, NeverBounce, ZeroBounceZeroBounce

Four alternatives

Bouncer, Clearout, Hunter, Kickbox

against: FreeEmailVerifier sites, MillionVerifier

Llama 4 Maverickno first choiceHunterChanged

Two alternatives

Email Finder, ZeroBounce

Hunter

Two alternatives

Clearout, Kickbox

Hunter

Four alternatives

EmailListVerify, Emailable, MyEmailVerifier, Proofy.io

no first choicenothing named

Qwen 3.7 FlashClearout

Four alternatives

EmailListVerify, Hunter, Kickbox, ZeroBounce

KickboxChanged

Two alternatives

NeverBounce, ZeroBounce

ZeroBounce

Four alternatives

Clearout, Emailable, Hunter, NeverBounce

Bouncer

Two alternatives

EmailListVerify, Verifalia

against: VitaMailno first choiceagainst: Bulk Email Checker, Hunter, MillionVerifier

Kimi K2Bouncer

Four alternatives

DeBounce, EmailListVerify, Hunter, ZeroBounce

BouncerHeld

Three alternatives

EmailListVerify, Emailable, ZeroBounce

Bouncer

Four alternatives

EmailListVerify, Emailable, Kickbox, ZeroBounce

BillionVerify, MyEmailVerifier

Three alternatives

Clearout, EmailListVerify, ZeroBounce

no first choiceagainst: Bouncify, EmailListVerify, EmailMarker, FindEmails.com, MillionVerifier

GLM 4.7 FlashXKickbox

Three alternatives

Clearout, DeBounce, NeverBounce

EmailListVerifyChanged

Three alternatives

Apollo.io, Hunter, ZeroBounce

Hunter

Four alternatives

Clearout, DeBounce, Kickbox, Prospeo

DeBounce, MyEmailVerifier

Four alternatives

Hunter, Kickbox, MillionVerifier, ZeroBounce

no first choiceagainst: Bouncify, Email List Validation, Lead Magic, MailerCheck, MillionVerifier, Snov.io, ZeroBounce

MiniMax M2.5Hunter

Two alternatives

DeBounce, ZeroBounce

ClearoutChanged

Three alternatives

Emailable, ZeroBounce, ZoomInfo

Hunter

Four alternatives

Bouncer, EmailListVerify, NeverBounce, Prospeo

MillionVerifier, Proofy.io

Three alternatives

DeBounce, LeadMagic, MyEmailVerifier

no first choiceagainst: NeverBounce, ZeroBounce

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 00:05	yes	8	8 s
Direct recommendation	GPT-5.4 mini	`gpt-5.4-mini-2026-03-17`	2026-09-14 22:52	yes	2	5 s
Direct recommendation	Gemini 3.5 Flash	`gemini-3.5-flash`	2026-09-15 03:38	yes	14	20 s
Direct recommendation	Perplexity Sonar	`sonar`	2026-09-15 02:22	yes	20	6 s
Direct recommendation	Grok 4.1 Fast	`spacexai/grok-4.1-fast-non-reasoning via vertex`	2026-09-15 03:38	yes	0	8 s
Direct recommendation	Mistral Small	`mistral/mistral-small via mistral`	2026-09-15 02:50	yes	0	7 s
Direct recommendation	DeepSeek V4 Flash	`deepseek/deepseek-v4-flash via fireworks`	2026-09-15 00:39	yes	0	12 s
Direct recommendation	Llama 4 Maverick	`meta/llama-4-maverick via bedrock`	2026-09-15 00:18	yes	0	2 s
Direct recommendation	Qwen 3.7 Flash	`alibaba/qwen3.7-flash via alibaba`	2026-09-15 02:26	yes	0	33 s
Direct recommendation	Kimi K2	`moonshotai/kimi-k2 via novita`	2026-09-15 03:14	yes	0	25 s
Direct recommendation	GLM 4.7 FlashX	`zai/glm-4.7-flashx via zai`	2026-09-15 00:24	yes	0	145 s
Direct recommendation	MiniMax M2.5	`minimax/minimax-m2.5 via minimax`	2026-09-15 01:18	yes	0	19 s
Paraphrase	Claude Haiku 4.5	`claude-haiku-4-5-20251001`	2026-09-15 03:12	yes	7	7 s
Paraphrase	GPT-5.4 mini	`gpt-5.4-mini-2026-03-17`	2026-09-15 05:00	no	0	4 s
Paraphrase	Gemini 3.5 Flash	`gemini-3.5-flash`	2026-09-15 02:12	yes	15	20 s
Paraphrase	Perplexity Sonar	`sonar`	2026-09-15 04:53	yes	20	4 s
Paraphrase	Grok 4.1 Fast	`spacexai/grok-4.1-fast-non-reasoning via vertex`	2026-09-15 03:08	yes	0	6 s
Paraphrase	Mistral Small	`mistral/mistral-small via mistral`	2026-09-15 02:30	yes	0	6 s
Paraphrase	DeepSeek V4 Flash	`deepseek/deepseek-v4-flash via fireworks`	2026-09-15 04:45	yes	0	17 s
Paraphrase	Llama 4 Maverick	`meta/llama-4-maverick via bedrock`	2026-09-15 04:43	yes	0	2 s
Paraphrase	Qwen 3.7 Flash	`alibaba/qwen3.7-flash via alibaba`	2026-09-15 01:11	no	0	38 s
Paraphrase	Kimi K2	`moonshotai/kimi-k2 via novita`	2026-09-15 01:19	yes	0	40 s
Paraphrase	GLM 4.7 FlashX	`zai/glm-4.7-flashx via zai`	2026-09-15 02:39	yes	0	93 s
Paraphrase	MiniMax M2.5	`minimax/minimax-m2.5 via minimax`	2026-09-14 23:07	yes	0	9 s
Comparative	Claude Haiku 4.5	`claude-haiku-4-5-20251001`	2026-09-15 03:32	yes	7	9 s
Comparative	GPT-5.4 mini	`gpt-5.4-mini-2026-03-17`	2026-09-14 23:11	yes	8	13 s
Comparative	Gemini 3.5 Flash	`gemini-3.5-flash`	2026-09-15 02:24	yes	16	27 s
Comparative	Perplexity Sonar	`sonar`	2026-09-14 22:56	yes	20	8 s
Comparative	Grok 4.1 Fast	`spacexai/grok-4.1-fast-non-reasoning via vertex`	2026-09-15 03:40	yes	0	7 s
Comparative	Mistral Small	`mistral/mistral-small via mistral`	2026-09-15 01:01	yes	0	8 s
Comparative	DeepSeek V4 Flash	`deepseek/deepseek-v4-flash via fireworks`	2026-09-15 03:19	yes	0	21 s
Comparative	Llama 4 Maverick	`meta/llama-4-maverick via bedrock`	2026-09-15 04:25	yes	0	2 s
Comparative	Qwen 3.7 Flash	`alibaba/qwen3.7-flash via alibaba`	2026-09-14 23:22	yes	0	34 s
Comparative	Kimi K2	`moonshotai/kimi-k2 via novita`	2026-09-15 02:35	yes	0	25 s
Comparative	GLM 4.7 FlashX	`zai/glm-4.7-flashx via zai`	2026-09-15 02:07	yes	0	149 s
Comparative	MiniMax M2.5	`minimax/minimax-m2.5 via minimax`	2026-09-15 04:03	yes	0	17 s
Budget constrained	Claude Haiku 4.5	`claude-haiku-4-5-20251001`	2026-09-14 23:57	yes	11	10 s
Budget constrained	GPT-5.4 mini	`gpt-5.4-mini-2026-03-17`	2026-09-15 00:23	yes	4	4 s
Budget constrained	Gemini 3.5 Flash	`gemini-3.5-flash`	2026-09-14 23:46	yes	13	16 s
Budget constrained	Perplexity Sonar	`sonar`	2026-09-15 00:06	yes	20	5 s
Budget constrained	Grok 4.1 Fast	`spacexai/grok-4.1-fast-non-reasoning via vertex`	2026-09-15 04:29	yes	0	9 s
Budget constrained	Mistral Small	`mistral/mistral-small via mistral`	2026-09-15 00:31	yes	0	6 s
Budget constrained	DeepSeek V4 Flash	`deepseek/deepseek-v4-flash via deepinfra`	2026-09-15 02:03	yes	0	27 s
Budget constrained	Llama 4 Maverick	`meta/llama-4-maverick via bedrock`	2026-09-15 00:12	yes	0	2 s
Budget constrained	Qwen 3.7 Flash	`alibaba/qwen3.7-flash via alibaba`	2026-09-14 23:59	yes	0	35 s
Budget constrained	Kimi K2	`moonshotai/kimi-k2 via novita`	2026-09-15 04:22	yes	0	24 s
Budget constrained	GLM 4.7 FlashX	`zai/glm-4.7-flashx via zai`	2026-09-15 02:00	yes	0	135 s
Budget constrained	MiniMax M2.5	`minimax/minimax-m2.5 via minimax`	2026-09-15 00:14	yes	0	8 s
Scale constrained	Claude Haiku 4.5	`claude-haiku-4-5-20251001`	2026-09-14 23:11	no	0	7 s
Scale constrained	GPT-5.4 mini	`gpt-5.4-mini-2026-03-17`	2026-09-15 03:28	no	0	5 s
Scale constrained	Gemini 3.5 Flash	`gemini-3.5-flash`	2026-09-15 04:16	no	0	12 s
Scale constrained	Perplexity Sonar	`sonar`	2026-09-15 00:16	yes	20	8 s
Scale constrained	Grok 4.1 Fast	`spacexai/grok-4.1-fast-non-reasoning via vertex`	2026-09-15 00:23	yes	0	9 s
Scale constrained	Mistral Small	`mistral/mistral-small via mistral`	2026-09-14 23:11	no	0	12 s
Scale constrained	DeepSeek V4 Flash	`deepseek/deepseek-v4-flash via fireworks`	2026-09-15 02:48	yes	0	21 s
Scale constrained	Llama 4 Maverick	`meta/llama-4-maverick via bedrock`	2026-09-15 00:38	yes	0	1 s
Scale constrained	Qwen 3.7 Flash	`alibaba/qwen3.7-flash via alibaba`	2026-09-15 01:31	no	0	25 s
Scale constrained	Kimi K2	`moonshotai/kimi-k2 via novita`	2026-09-15 03:00	yes	0	78 s
Scale constrained	GLM 4.7 FlashX	`zai/glm-4.7-flashx via zai`	2026-09-15 04:00	yes	0	42 s
Scale constrained	MiniMax M2.5	`minimax/minimax-m2.5 via minimax`	2026-09-15 01:24	yes	0	21 s
Negative framing	Claude Haiku 4.5	`claude-haiku-4-5-20251001`	2026-09-15 03:33	yes	17	8 s
Negative framing	GPT-5.4 mini	`gpt-5.4-mini-2026-03-17`	2026-09-14 23:11	yes	4	5 s
Negative framing	Gemini 3.5 Flash	`gemini-3.5-flash`	2026-09-15 00:07	yes	16	24 s
Negative framing	Perplexity Sonar	`sonar`	2026-09-14 23:41	yes	20	15 s
Negative framing	Grok 4.1 Fast	`spacexai/grok-4.1-fast-non-reasoning via vertex`	2026-09-15 04:15	yes	0	9 s
Negative framing	Mistral Small	`mistral/mistral-small via mistral`	2026-09-15 01:43	yes	0	11 s
Negative framing	DeepSeek V4 Flash	`deepseek/deepseek-v4-flash via fireworks`	2026-09-15 04:54	yes	0	20 s
Negative framing	Llama 4 Maverick	`meta/llama-4-maverick via bedrock`	2026-09-15 00:31	yes	0	1 s
Negative framing	Qwen 3.7 Flash	`alibaba/qwen3.7-flash via alibaba`	2026-09-14 23:03	yes	0	62 s
Negative framing	Kimi K2	`moonshotai/kimi-k2 via novita`	2026-09-14 23:30	yes	0	44 s
Negative framing	GLM 4.7 FlashX	`zai/glm-4.7-flashx via zai`	2026-09-15 01:57	yes	0	69 s
Negative framing	MiniMax M2.5	`minimax/minimax-m2.5 via minimax`	2026-09-15 00:32	yes	0	33 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

Email Finder

FreeEmailVerifier sites

Hunter.io Email Verifier

Validto

VitaMail

VoilaNorbert

Discontinued, still offered

No shut-down product was recommended here.

Email verification for small business buyers

By buyer segment

01The standing

Recommended versus criticized

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