9 Best Email Verification Tools in 2026: Price per 1,000, Catch-All and Tests

Quick answer: On list price, DeBounce ($25 for 10,000 checks) and MillionVerifier ($39 for 10,000, with catch-all and unknown results free) are the cheapest ways to clean a list. Bouncer and Emailable ($60 for 10,000) add stronger guarantees and toxicity or enrichment extras. ZeroBounce and NeverBounce cost more but bundle scoring, integrations and deliverability tools. Hunter makes sense if you already use it to find emails. Prices are vendor-published, checked September 2026, pay-as-you-go in USD.

Email verification tools check whether an address can receive mail before you send to it. Every vendor claims 98% or 99% accuracy, and the head-to-head tests you find online disagree wildly: one vendor’s test puts every tool between 31% and 70% accurate, while another reports 96% to 99.9% for the same tools. The difference is almost entirely in how each test treats “catch-all” and “unknown” results.

So this guide focuses on what you can check: price per 1,000 and 10,000 verifications, whether you pay for catch-all and unknown results, what the guarantee actually covers, and the API limits. We did not run our own send test; every number below is vendor-published or attributed to the test that published it.

Email Verification Tools Compared: Price per 1,000 and 10,000

Tool	1,000 checks	10,000 checks	100,000 checks	Free credits	Pay for catch-all?	Pay for unknown?	Credits expire?
DeBounce	Min 5,000 for $15	$25 ($2.50/1k)	$135	100	Yes (1 credit); deep catch-all check 10 credits	Not stated	Never
MillionVerifier	Min 10,000	$39 ($3.90/1k)	$149	100	No	No	Never
Bouncer	$8	$60 ($6.00/1k)	$400	100	Yes (1 credit)	No	Never
Emailable	Min 5,000 for $38	$60 ($6.00/1k)	$420	250	Yes (1 credit)	No (refunded)	Never
Kickbox	$10	$70 ($7.00/1k)	$500	100	Yes (“risky” result)	No (refunded)	Not stated
NeverBounce	$8	$80 ($0.008 each, per NeverBounce)	Not shown	10	Not stated	Not stated	12 months after purchase
ZeroBounce	Min 2,000 for $39	$129 ($12.90/1k)	Not shown on page	100 a month (business domain)	Yes; AI scoring +1 credit	No	Never with a ONE subscription
Clearout	Starter 3,000/mo	Pro 10K: $32/mo billed annually ($40 list)	Plan tiers	100 (lifetime)	Yes (1 credit)	No	Never; rollover
Hunter	No pay-as-you-go; 0.5 credit per check inside plans from $34/mo billed annually (2,000 credits = 4,000 checks)			50 credits/mo	0.5 credit	No	Plan allowance

Vendor-published, checked September 2026. Per-1k figures are our division of the package price. ZeroBounce’s 2,000 and 10,000 prices come from its pricing page; NeverBounce’s 10,000 figure uses the $0.008 per email rate NeverBounce publishes for lists up to 10,000. Kickbox was showing a promotional discount code when we checked; the table uses list prices.

How Email Verification Works

A verifier runs each address through a sequence of checks, cheapest first:

1. Syntax and typo checks catch malformed addresses and common misspellings such as gmial.com.
2. Domain and MX checks confirm the domain exists and has a mail server.
3. Risk lists flag disposable addresses, role accounts (info@, sales@) and known spam traps or complainers. Bouncer calls this a “Toxicity Check”; ZeroBounce returns statuses such as spamtrap, abuse and do_not_mail.
4. SMTP mailbox check. The verifier opens a conversation with the mail server and asks whether the specific mailbox exists, then disconnects before sending anything.

The result is usually one of four statuses: valid (deliverable), invalid (will bounce), catch-all (accept-all, can’t be confirmed) and unknown (the server didn’t answer in time or blocked the check).

Catch-All Emails: Where Verifiers Really Differ

A catch-all domain accepts mail for any address, so the SMTP check always says yes. The verifier can’t tell a real mailbox from a made-up one. How a tool handles these addresses decides both your bounce rate and your bill.

• Free: MillionVerifier says “you only pay for good and bad emails and not for risky (unknown and catch-all) emails” and includes advanced catch-all verification at no extra cost.
• Charged as a normal check: Clearout, Bouncer, Emailable and Kickbox charge one credit for a catch-all result. Bouncer advertises “Deep Verification of Catch-All” for Google- and Microsoft-hosted domains.
• Paid resolution: DeBounce sells a catch-all validation step at 10 credits per address. ZeroBounce charges 1 extra credit for AI scoring, which it recommends for catch-alls.
• Labelled only: NeverBounce returns an “Accept all (Unverifiable)” code and notes that “catch-alls bounce at about half your list’s invalid rate.”

If a large share of your list sits on catch-all domains (common in B2B), a tool that resolves them can recover sendable contacts; a tool that only labels them leaves you to decide whether to risk them.

What the Published Tests Actually Show

The top result on Google for this topic is a Reddit thread describing a 10,000-email test across six verifiers. We couldn’t access the thread to check its method, so we don’t quote its numbers. Here are the tests we could read, with who ran them:

Test	Run by	Method	Result
Hunter, Nov 2025	Hunter (a tested vendor; it says its ground truth “may have given Hunter an edge”)	About 3,000 emails of known status across 15 verifiers; unknown and accept-all results count as wrong	Hunter 70.0%, Clearout 68.4%, Kickbox 67.5%, Bouncer 65.4%, NeverBounce 63.2%, ZeroBounce 60.7%, Emailable 59.9%, DeBounce 59.6%
Warmup Inbox, Nov 2025	A warmup-tool vendor	Same 10,000-contact list across platforms; ground truth not described	Bouncer 98.9%, ZeroBounce 98.8%, Emailable 98.7%, NeverBounce 98.6%, Kickbox 98.4%, Clearout 98.1%, MillionVerifier 97.9%

Same tools, very different numbers. Hunter’s strict scoring punishes every “unknown” and “catch-all” as an error, so it really measures how decisive each tool is. The high-90s tests measure something closer to “of the addresses marked valid, how many were valid”. Neither is wrong; they answer different questions. The consistent pattern is that Bouncer, Kickbox and Clearout rank in the upper half of both.

To test for yourself, the approach behind that Reddit-style test is sound: run the same list through three tools, compare how many addresses each marks valid, invalid, catch-all and unknown, then send to a sample of each bucket and count hard bounces.

ZeroBounce vs NeverBounce: Which Is Better?

This is the most searched pairing in the category, and they suit different buyers.

	ZeroBounce	NeverBounce
Owner	No parent company named on its site	ZoomInfo
Pay-as-you-go	From $39 for 2,000; $129 for 10,000	$8 per 1,000; $0.008 per email up to 10,000
Subscription	ZeroBounce ONE $99/mo: 10,000 validations plus finder, inbox tests, blacklist monitoring and warmup	Growth $49/mo for up to 10,000
Free credits	100 a month with a business domain	10
Catch-all	Separate status; AI scoring for 1 extra credit	Labelled “Accept all (Unverifiable)”
Guarantee	Claims “guaranteed 99.6% accuracy”; no refund process described	Bounces capped at 3% or it refunds the difference (list cleaned within 72 hours; valid, non-freemail addresses only)
Credit expiry	Never, with an active ONE subscription	12 months after purchase

Verdict: NeverBounce is cheaper at small and medium volumes and has the clearer written guarantee; its $49 Growth plan is good value if you verify up to 10,000 addresses every month. ZeroBounce costs more per check but bundles scoring, an email finder and deliverability tools, which suits marketing teams that want one account for list health. In Hunter’s test NeverBounce scored 63.2% and ZeroBounce 60.7%; in Warmup Inbox’s, 98.6% and 98.8%. That is too close to decide on accuracy alone. Compare more detail on our NeverBounce vs ZeroBounce page.

The Best Email Verification Tools in 2026

1. Bouncer: best balance of price, accuracy and guarantee

Bouncer is credits only, with no monthly plan to manage, and its credits never expire. It says only 2% of emails are ever marked unknown and refunds you for contacts it marked deliverable that bounce within 72 hours. Extras include a Toxicity Check for breached, complainer and possible spam-trap addresses, plus a separate Deliverability Kit from $25 a month.

• Price: $8 for 1,000; $60 for 10,000; $400 for 100,000. 100 free credits.
• API: 1,000 real-time requests a minute; batch 200 a minute.

2. MillionVerifier: best for large, cheap list cleaning

MillionVerifier is built for volume. It doesn’t charge for catch-all or unknown results and refunds your last payment if your hard-bounce rate after verification exceeds 4%. Its homepage headline is “1 Million verifications for $449.”

• Price: minimum $39 for 10,000; $149 for 100,000. 100 free credits; credits never expire.
• Watch out for: fewer extras than Bouncer or ZeroBounce, and API rate limits aren’t published.

3. DeBounce: lowest list price

DeBounce has the lowest per-check prices we found: $25 for 10,000 and $750 for a million. Its guarantee promises 97.5% deliverability, with extra credits if you miss it and a full refund above 8% bounces.

• Price: minimum 5,000 for $15; $135 for 100,000. Catch-all validation is a separate step at 10 credits per address.
• API: up to 5 concurrent calls; one bulk job at a time per account.

4. Emailable: best for marketing teams

Emailable pairs verification with inbox placement reports and blacklist monitors, and refunds duplicates and unknown results. Its guarantee covers 99% deliverability on most addresses and 97% on Microsoft-hosted ones.

• Price: minimum 5,000 for $38; $60 for 10,000; $420 for 100,000. A monthly credits subscription saves 15%. 250 free credits.
• API: 25 single verifications a second; batches up to 50,000 emails.

5. Kickbox: best developer API

Kickbox, part of the Ziff Davis group, returns a Sendex quality score with each result and refunds any check it can’t answer definitively. Its API allows 25 parallel requests per IP and 8,000 requests a minute, and a sandbox mode that doesn’t use credits.

• Price: $5 for 500; $10 for 1,000; $70 for 10,000; $500 for 100,000. 100 free checks.

6. NeverBounce: best written bounce guarantee

NeverBounce, owned by ZoomInfo, guarantees that no more than 3% of verified-valid addresses will bounce and refunds the difference if they do (conditions apply, see above). Its Growth plan folds in automatic CRM cleaning.

• Price: $8 per 1,000 pay-as-you-go; Growth $49 a month for up to 10,000. Credits expire 12 months after purchase.

7. ZeroBounce: best all-in-one deliverability suite

ZeroBounce’s ONE subscription ($99 a month) includes 10,000 validations, 10,000 finder credits, inbox tests, blacklist monitors and warmup seeds. It lists 95 integrations and never charges for unknown results.

• Price: pay-as-you-go from $39 for 2,000; $129 for 10,000. 100 free validations a month with a business email. Single-email API calls are not rate-limited, per its docs.

8. Clearout: best for bulk jobs and forms

Clearout sells monthly and annual plans with rollover and never-expiring credits, plus Form Guard for sign-up forms. It guarantees a bounce rate under 3% for addresses it marks “Guaranteed Deliverable”, if you send within 24 hours.

• Price: Pro 10K is $32 a month billed annually ($40 list) for 10,000 credits a month; Starter covers 3,000 a month. Its pricing guide says pay-as-you-go is closed to new users.
• Limits: files up to 1 million emails; API from 25 requests a minute on Starter.

9. Hunter: best if you already find emails with Hunter

Hunter’s verifier is part of its finder plans, at 0.5 credit per check, and it doesn’t charge when a result comes back unknown. It says it can verify accept-all addresses at “several major email providers”. It isn’t the cheapest pure verifier, but there’s no second tool to manage. See our guide to email finder tools for the finder side.

API Limits at a Glance

Tool	Real-time API limit (published)	Bulk
Bouncer	1,000 requests/min real-time; 200/min batch	Batch API
Kickbox	25 parallel per IP; 8,000/min	Bulk upload
Emailable	25/sec single; 5/sec batch	Up to 50,000 per batch
ZeroBounce	Single validate not rate-limited; batch 200 per call	No file size limit stated
Hunter	10/sec, 300/min	Bulk verifier
Clearout	3 RPM free; 25 RPM Starter; higher on bigger plans	1M emails per file
DeBounce	5 concurrent calls	One active bulk job per account

What Is a Good Free Email Verification Tool?

For small checks, Emailable (250 free credits), ZeroBounce (100 a month with a business domain), Clearout (100 lifetime), Bouncer, Kickbox, MillionVerifier and DeBounce (100 each) all let you test without paying. Hunter’s free plan covers 100 verifications a month. None of these is enough for a real campaign list, but they are ideal for comparing tools on the same 100 addresses before you buy.

How to Choose an Email Verification Tool

• Price the whole list, not the headline. Minimum purchases range from 500 checks (Kickbox) to 10,000 (MillionVerifier).
• Check catch-all and unknown billing. On a B2B list this can change your real cost more than the per-check price.
• Read the guarantee’s conditions. Most require you to send within 24 to 72 hours and exclude freemail or Microsoft addresses.
• Match the volume pattern. One-off cleans suit non-expiring credits (Bouncer, MillionVerifier, DeBounce, Emailable). Steady monthly volume suits a subscription (NeverBounce Growth, ZeroBounce ONE, Clearout).
• Verify at the source. A real-time API on sign-up forms stops bad addresses entering your list at all.

Compare more options in our email verification tools category.

Frequently Asked Questions

Related reading: Best Email Finder Tools, Best Data Enrichment Tools, Best B2B Data Providers, Apollo.io Review

Sources

• Vendor pricing and help pages, checked September 2026: ZeroBounce, NeverBounce and its guarantee, Kickbox, Bouncer, Clearout, MillionVerifier, Emailable, DeBounce, Hunter
• Hunter: best email verifiers benchmark
• Warmup Inbox: best email verification tools