Free Tier Report • 2026 Edition

Free Email Verifier Tools We Tested in 2026 (Full Breakdown)

We checked 10 email verifier tools with real free tiers (not 7-day trials) and compared free monthly credits, accuracy, API access, and what you actually get before paying. Built for cold emailers, list owners, and freelancers who want to verify without a credit card.

Harsh Shah Founder, Mailsfinder

calendar_month Published June 11, 2026

calendar_today Jun 2026

lab_profile 10 Tools Tested

money_off Real Free Tiers Only

schedule 12 min read

lightbulb Key takeaways

arrow_rightFree email verifier tiers range from 25 monthly credits (Hunter.io) to 100 daily credits with no expiry (Mailsfinder, roughly 3,000 per month). Daily-reset models almost always beat fixed monthly caps for ongoing use.
arrow_rightOnly three tools in this list (Mailsfinder, Reoon, Hunter.io) include free API access on the free tier. The rest reserve API keys for paid plans.
arrow_rightZeroBounce stays the most established name for deliverability teams, with 99.6% guaranteed accuracy and 4.7 on G2 from 1,361 reviews. Free tier is capped at 100 monthly checks.
arrow_rightFor finding plus verifying in one workflow, Mailsfinder bundles both behind a single 100-credit-daily free tier. Most verifiers here only verify, so you still need a separate email finder.
arrow_rightIf your free tier runs out, MillionVerifier ($4.90 per 2,000 PAYG credits) and Bouncer (around $7 per 1,000) deliver the lowest cost paid bridge for occasional bulk cleans.
arrow_rightSnov.io and Hunter.io free tiers also include email finding credits, useful if you want to test a finder-plus-verifier combo without a Mailsfinder account.
arrow_rightReoon Email Verifier scores the highest G2 rating in the list (4.8 from 1,018 reviews) and offers the most generous free monthly cap among verification-only tools at 600 credits.

Jump to a tool

1. Mailsfinder 2. ZeroBounce 3. Reoon 4. Hunter.io 5. Snov.io 6. Bouncer 7. Kickbox 8. Verifalia 9. Emailable 10. MillionVerifier

How We Tested • Comparison Table • Category Picks • Pricing • FAQ

How we picked these tools

Every tool here has a real free tier (not a 7-day trial). We compared what you get without paying, plus the upgrade path when your free credits run out.

money_off

Real free tier

Recurring free credits, not a one-time trial that expires after 7 days.

verified

Accuracy

Same verification engine on the free tier as on the paid plan.

api

API on free

API access available without paying, useful for signup form validation.

filter_alt

Catch-all handling

How catch-all domains are flagged or scored on the free tier.

upload_file

Bulk CSV upload

Whether you can upload a list rather than verify one email at a time.

payments

Upgrade path

Cost of the cheapest paid plan when your free credits run out.

Master comparison table

#	Tool	Free Credits	Reset	Free API	Best For	Paid Starts	Rating
1	Mailsfinder	100/day	Daily, forever	check_circle	Finding + verifying	$49/mo	N/A (new) star
2	ZeroBounce	100/mo	Monthly	check_circle	Deliverability teams	$39/2K	4.7 (G2) star
3	Reoon	600/mo + 100	Daily (20/day)	check_circle	Budget bulk verifying	$9/mo	4.8 (G2) star
4	Hunter.io	25/mo	Monthly	check_circle	Finder + verifier	$49/mo	4.4 (G2) star
5	Snov.io	50 credits	Monthly (renewable trial)	cancel	Finder + drip campaigns	$39/mo	4.5 (G2) star
6	Bouncer	100 trial	One-time	cancel	GDPR-focused bulk cleans	$7/1K	4.7 (G2) star
7	Kickbox	100 free	One-time	check_circle	Developer-first teams	$5/500	4.5 (G2) star
8	Verifalia	25/day	Daily	cancel	Single-address lookups	$11/1K	4.6 (G2) star
9	Emailable	250 signup	One-time	cancel	Clean API integration	$38/5K	4.5 (G2) star
10	MillionVerifier	500 trial	One-time (business email)	cancel	Cheapest paid upgrade	$4.90/2K	4.3 (G2) star

Want to try the verification engine before signing up anywhere? Mailsfinder has free widgets at /tools/email-verifier (single address) and /tools/bulk-email-verifier (CSV upload).

Mailsfinder

EMAIL FINDER + VERIFIER

Most free email verifier tools cap you at 100 monthly credits. Mailsfinder gives 100 credits every day with no expiry, which works out to roughly 3,000 verifications per month before you pay anything. The free tier also includes API access and bundles email finding in the same credit pool, so a single account covers both sides of cold email prep. There is no credit card required at signup. Paid plans start at $49/mo for 10,000 monthly credits when daily limits stop being enough.

Key features

check

100 free daily credits with no monthly cap or expiry

check

Email finding included in the same credit pool

check

REST API access on the free tier for automation

check

Free bulk CSV verifier widget with no signup

Pros

check_circleHighest free monthly volume in this list
check_circleFinding plus verifying on one credit pool
check_circleFree API access and free bulk widget

Cons

cancelNewer than ZeroBounce or Hunter.io
cancelNo bulk warmup or sender reputation feature
cancelSmaller user community on G2 and Reddit

"Real free tier review pending. Live user testimonials will replace this placeholder as Mailsfinder collects verified G2 reviews."
-- Placeholder via internal feedback

Free: 100/day forever Paid: $49/mo (10K credits)

ZeroBounce

DELIVERABILITY-FIRST VERIFIER

Deliverability teams trust ZeroBounce because the 99.6% accuracy claim is backed by a refund guarantee, and the platform layers in spam trap detection, abuse flagging, and an Activity Score on top of basic SMTP checks. The free tier gives 100 monthly verifications, which is enough to clean a small inbound list or check a handful of imports before sending. Free credits include API access, so a developer can prototype a signup form validator without paying. Past 100/mo, PAYG starts at $39 for 2,000 credits.

Key features

check

100 monthly verifications on the free tier

check

Spam trap detection and abuse email flagging

check

99.6% accuracy guarantee with refund policy

check

8,000+ integrations via Zapier and native connectors

Pros

check_circleMost established name in verification
check_circleDedicated spam trap detection on every plan
check_circleFree API access included on the free tier

Cons

cancelFree tier capped at 100 monthly checks
cancelPAYG credits expire after 12 months
cancelPremium pricing past the free tier

"ZeroBounce cut our bounce rate from 8% to under 0.5%. The spam trap detection alone has saved us from deliverability disasters."
-- Email Marketing Manager, E-commerce via G2

Free: 100/mo Paid: $39/2K (PAYG)

Reoon Email Verifier

BULK VERIFIER ON A BUDGET

Reoon scores the highest G2 rating in this list (4.8 from 1,018 reviews) and pairs it with the most generous free monthly cap among verification-only tools: 600 credits per month via a 20-credit daily limit, plus a one-time 100 instant credits at signup. API access is on the free tier, and so is a WordPress plugin for signup form verification. When you outgrow the free tier, daily subscriptions start at $9/mo for 500 verifications per day, which equates to roughly 15,000 monthly credits.

Key features

check

600 free monthly credits via 20/day cap

check

One-time 100 instant credits at signup

check

Free API access and WordPress plugin

check

$9/mo paid plan unlocks 15,000 monthly credits

Pros

check_circleHighest G2 rating in this list (4.8/5)
check_circleMost generous verification-only free tier
check_circleFree tier includes API and WordPress plugin

Cons

cancelAccuracy may drop on heavy catch-all lists
cancelBasic dashboard and reporting
cancelLimited native CRM integrations

"For the price, Reoon is hard to beat. Verification is fast and accurate enough for our cold email lists of 5,000 to 10,000 contacts."
-- Cold Email Specialist via G2

Free: 600/mo + 100 instant Paid: $9/mo (15K credits)

Hunter.io

BUILT-IN VERIFIER

Best known as an email finder, Hunter.io also ships a built-in verifier that runs automatically on every email it surfaces. The free tier gives 25 monthly verifications and 50 monthly email lookups, with API access included. That makes Hunter useful for freelancers who want a single tool covering both prospecting and verification without paying. Independent tests put the standalone verifier closer to 91% accuracy, and the credit cap fills up fast if you are running real outreach. Paid plans start at $34/mo (annual) or $49/mo monthly.

Key features

check

25 free verifications and 50 lookups per month

check

Auto-verification on every email finder result

check

Free API access on the free tier

check

Integrations with HubSpot, Salesforce, Pipedrive, Sheets

Pros

check_circleFamiliar interface for cold email beginners
check_circleFinder plus verifier on a single free tier
check_circleFree Chrome extension for LinkedIn lookups

Cons

cancelFree tier capped at 25 verifications per month
cancelStandalone verifier accuracy lower than ZeroBounce
cancelPaid plans pricey for the credit volume offered

"Hunter's free tier is fine for casual prospecting, but you blow through 25 verifications in about 10 minutes if you are running campaigns."
-- Growth Marketer via G2

Free: 25 verify + 50 find/mo Paid: $34/mo (annual)

Snov.io

FINDER + VERIFIER + CAMPAIGNS

Sales teams pick Snov.io when they want one platform for finding, verifying, and sending. The free trial renews monthly with 50 credits and 100 recipients, which covers a small outreach test without paying. Verification runs on a seven-tier process that Snov.io claims reaches 93% accuracy, with Reddit reports closer to 75-80%. API access is gated behind paid plans (Starter and above), which is a downside for developers. Paid tiers start at $39/mo monthly or $29.25/mo on annual billing.

Key features

check

50 free credits + 100 free recipients per month

check

Seven-tier verification process built into every lookup

check

5,000+ Zapier integrations and HubSpot, Pipedrive sync

check

Drip campaigns and warmup built into the platform

Pros

check_circleRenewable free trial keeps credits coming back
check_circleSending and warmup included on the platform
check_circleAffordable annual pricing at $29.25/mo

Cons

cancelNo API access on the free tier
cancelCluttered UI when managing multiple campaigns
cancelReported accuracy lower than the 93% claim

"Snov.io's free trial is one of the better ones because it renews. Just be aware you cannot script anything without a paid plan."
-- SDR Team Lead via G2

Free: 50 credits + 100 recipients/mo Paid: $29.25/mo (annual)

Bouncer

GDPR-FOCUSED VERIFIER

European list owners who care about GDPR keep recommending Bouncer because the platform is EU-hosted and explicitly compliant. The free tier is a one-time 100-credit trial rather than a recurring monthly allowance, so it works best as a way to test accuracy before committing to PAYG. Verification quality is strong (G2 sits at 4.7 from teams who rate accuracy heavily), and the interface stays clean for non-technical list owners. Past the trial, PAYG starts at around $7 per 1,000 credits.

Key features

check

100 free credits one-time at signup

check

EU-hosted infrastructure, GDPR compliant

check

Catch-all confidence scoring built-in

check

Clean web UI with bulk CSV upload

Pros

check_circleGDPR-friendly EU infrastructure
check_circleCatch-all confidence scoring on every report
check_circle4.7 G2 from accuracy-focused teams

Cons

cancelFree credits are one-time, not recurring
cancelNo API access on the free tier
cancelFewer native CRM connectors than ZeroBounce

"Bouncer is the verifier I trust most for EU-heavy lists. The catch-all scoring saves us from blanket-excluding domains."
-- Email Ops Manager via G2

Free: 100 trial credits Paid: ~$7/1K (PAYG)

Kickbox

DEVELOPER-FIRST VERIFIER

Developers integrating verification into a signup flow tend to land on Kickbox because the REST API is well-documented and the Sendex score (a 0-1 deliverability confidence rating) is uniquely useful. The free tier is 100 one-time verifications, with API access included so you can prototype before paying. Past that, Kickbox runs pure PAYG: $5 for 500 credits, scaling down to $0.004 per email at 1 million credits. There is no subscription option, which suits teams with bursty verification needs.

Key features

check

100 free one-time verifications with API access

check

Sendex score for deliverability confidence

check

PAYG model with no monthly commitment

check

Credits expire after 12 months

Pros

check_circleCleanest API docs in this list
check_circleSendex score adds confidence beyond valid/invalid
check_circlePAYG keeps small teams out of subscriptions

Cons

cancelFree tier is one-time, not recurring
cancelPer-email cost higher than MillionVerifier
cancelCredits expire after 12 months

"Kickbox is the verifier I reach for when I want to build something. The API just works and the Sendex score is genuinely useful."
-- Backend Engineer via G2

Free: 100 one-time Paid: $5/500 (PAYG)

Verifalia

SINGLE-ADDRESS LOOKUPS

Freelancers and small teams verifying one or two addresses per day reach for Verifalia because the free tier resets every 24 hours: 25 verifications a day, every day, without a paid upgrade. The web UI is simple and built for single-address lookups rather than CSV bulk runs. Quality scores include a confidence value for catch-all domains, which is unusual on a free tier. API access stays on paid plans, so this one is best for manual users rather than developers. Paid starts at around $11 per 1,000 credits.

Key features

check

25 daily free verifications, resets every 24h

check

Catch-all confidence scoring on every result

check

Clean single-address web widget

check

Italian-based platform, EU data residency available

Pros

check_circleDaily-reset free tier suits freelancers
check_circleCatch-all confidence scoring on free plan
check_circleEU data residency for GDPR-sensitive teams

Cons

cancelAPI access locked behind paid plans
cancelNot built for large bulk CSV imports
cancelSmaller integration ecosystem

"Verifalia is the one I keep open in a tab for quick checks. The daily reset means I never have to think about credits."
-- Freelance Marketer via G2

Free: 25/day Paid: ~$11/1K (PAYG)

Emailable

CLEAN API + BULK VERIFIER

When you sign up to Emailable, 250 free credits land in your account immediately, which is one of the more generous one-time tiers in this list. The platform is built for both bulk CSV cleaning and real-time API verification, with sub-second response times that suit signup form validation. Credits never expire and unused subscription credits roll over. The downside is that the free tier is a one-time grant rather than recurring, so heavy users move to PAYG ($38 for 5,000 credits) or monthly subscriptions ($32.30/mo for 5,000) quickly.

Key features

check

250 free credits at signup, never expire

check

Bulk CSV upload and real-time API verification

check

Subscription credits roll over month to month

check

15% discount on monthly vs PAYG pricing

Pros

check_circleLarger one-time free grant than ZeroBounce
check_circleCredits never expire on free or paid plans
check_circleSub-second API response for signup flows

Cons

cancelFree tier is one-time, not monthly recurring
cancelPer-email cost higher than MillionVerifier
cancelLimited native CRM integrations

"Emailable's API is fast enough to verify on the signup form without slowing the page down. That alone is worth the price."
-- Product Engineer via G2

Free: 250 one-time Paid: $38/5K (PAYG)

MillionVerifier

CHEAPEST PAID UPGRADE

Reddit threads keep recommending MillionVerifier when a free tier runs out and budget is tight. The free tier itself is a 500-credit one-time trial (only available with a business email), so this list features it less for its free credits and more for the cheapest paid upgrade path: $4.90 for 2,000 credits, dropping to roughly $0.00017 per email at 50 million credits. Credits never expire, and there is a money-back guarantee if hard bounces exceed 4%. EverClean automated recurring verification rounds out the offering.

Key features

check

500 free trial credits (business email required)

check

Cheapest PAYG starter pack at $4.90 for 2,000

check

Credits never expire on any plan

check

EverClean automated recurring list cleaning

Pros

check_circleLowest paid upgrade cost in this list
check_circleNon-expiring credits reduce waste
check_circleMoney-back guarantee on accuracy

Cons

cancelFree trial requires business email
cancelInconsistent results on Yahoo addresses
cancelSupport response can take up to 72 hours

"We clean 500K+ emails monthly and MillionVerifier costs us a fraction of what ZeroBounce quoted. Accuracy is solid for the price."
-- Email Marketing Lead, Agency via G2

Free: 500 trial (business email) Paid: $4.90/2K (PAYG)

The category picks

all_inclusive

Highest free monthly volume

Most verifications per month without ever paying or signing up twice.

Our pick Mailsfinder

Also strong Reoon

shield

Best for deliverability teams

When sender reputation matters and you want an accuracy guarantee.

Our pick ZeroBounce

Also strong Bouncer

code

Best free tier with API

API access on the free plan, useful for signup form validation prototypes.

Our pick Kickbox

Also strong Reoon

Best finder + verifier combo

One free account that covers both prospecting and verification.

Our pick Mailsfinder

Also strong Hunter.io

person_search

Best for single-address lookups

Daily-reset free credits for freelancers verifying ad-hoc addresses.

Our pick Verifalia

Also strong Mailsfinder

savings

Cheapest paid upgrade

When the free tier runs out and you need bulk credits without a subscription.

Our pick MillionVerifier

Also strong Bouncer

Free tier vs paid upgrade pricing

Every tool here has a free tier. Here is what each costs when you outgrow it.

Tool	Free Tier	Paid Entry Price	Paid Credits	Paid Cost/Email	Model
Mailsfinder	100/day forever	$49/mo	10,000	$0.0049	Subscription
ZeroBounce	100/mo	$39	2,000	$0.0195	PAYG + Sub
Reoon	600/mo + 100 instant	$9/mo	15,000/mo	$0.0006	Sub + PAYG
Hunter.io	25 verify + 50 find /mo	$34/mo (annual)	2,000	$0.017	Subscription
Snov.io	50 credits + 100 recipients/mo	$29.25/mo (annual)	1,000	$0.029	Subscription
Bouncer	100 trial	~$7	1,000	$0.007	PAYG + Sub
Kickbox	100 one-time	$5	500	$0.01	PAYG only
Verifalia	25/day	~$11	1,000	$0.011	PAYG + Sub
Emailable	250 one-time	$38	5,000	$0.0076	PAYG + Sub
MillionVerifier	500 trial	$4.90	2,000	$0.00245	PAYG only

* Pricing reflects entry-level plans as of June 2026. Volume discounts are available from most tools. Verify current pricing on each tool's website before purchasing.

info

Note: Free tiers and pricing change frequently. Always check the tool's site before signing up. To verify a single email or a CSV right now without signing up anywhere, use the Mailsfinder free widgets at /tools/email-verifier and /tools/bulk-email-verifier.

Frequently asked questions

What is a free email verifier and how is it different from a paid one? expand_more

A free email verifier checks whether an email address is valid, deliverable, and safe to send to, without charging you for a baseline volume of checks. Tools like Mailsfinder give 100 daily credits forever, ZeroBounce offers 100 free monthly verifications, and Reoon includes 600 monthly credits plus 100 instant credits. Paid plans simply unlock higher volume, bulk CSV uploads, and API access. The verification logic (SMTP handshake, catch-all detection, syntax check) is the same on the free tier as on the paid tier for most reputable tools.

Which free email verifier gives the most credits per month? expand_more

Mailsfinder offers 100 daily credits that reset every 24 hours, which works out to around 3,000 verifications per month with no expiry. Reoon Email Verifier provides 600 monthly credits via a daily 20-credit cap plus a one-time 100 instant credits. ZeroBounce gives a flat 100 verifications per month. Snov.io includes 100 monthly recipients as part of its free trial. For freelancers or list owners who only need to verify a few addresses per day, the daily-reset model from Mailsfinder and Reoon usually beats a monthly cap.

Are free email verifier tools accurate enough for cold email? expand_more

For most cold email use cases, yes. Free tiers from ZeroBounce, Mailsfinder, Bouncer, Kickbox, and Reoon use the same verification engine as their paid plans, so accuracy on the free tier is identical to the paid tier. The only constraint is volume. If you are verifying a list of 5,000 emails before launching a cold campaign, you will need to pay for credits on most tools. Verifalia, Bouncer, and Emailable typically claim 98%+ accuracy, while Hunter.io's built-in verifier sits closer to 91% in independent tests.

Can I verify a bulk list for free? expand_more

Most free tiers cap you at 100 to 600 verifications per month, which is not enough for bulk list cleaning. For lists above 1,000 emails, you will need to either pay for credits (MillionVerifier at $4.90 per 2,000 credits is the cheapest one-time pack) or split your list across multiple free tools. Mailsfinder's free bulk verifier widget at /tools/bulk-email-verifier lets you upload a CSV against your 100 daily credits, which is enough for several days of small-batch cleaning.

Do free email verifiers include API access? expand_more

Several do. Hunter.io, ZeroBounce, Reoon, and Mailsfinder all expose their verification API on the free tier so developers can build signup form validation or workflow automations without paying. Snov.io and Bouncer keep API access on paid plans only. If you are building a product that needs real-time verification at the point of signup, choose a tool with API access on the free tier first, then upgrade only when your volume justifies it.

What happens to a free email verifier's accuracy on catch-all domains? expand_more

Catch-all domains accept all incoming email regardless of whether the mailbox exists, so no SMTP-based verifier can confirm a specific address with certainty. ZeroBounce, Bouncer, and Verifalia use historical data and pattern recognition to assign confidence scores on catch-all results. Mailsfinder, MillionVerifier, Kickbox, and Reoon flag catch-all addresses so you can decide whether to send. The same catch-all logic runs on free and paid tiers, so the limitation is identical across both. For tight bounce tolerances, exclude catch-alls or use a tool with confidence scoring.

Which free email verifier is best for single-address lookups? expand_more

For one-off checks (verifying a single address before replying or before importing into a CRM), Mailsfinder, Hunter.io, and Verifalia all offer free web widgets that let you paste an email and get a result in seconds. Mailsfinder's free email verifier widget is the most generous with 100 daily checks, while Hunter.io includes 25 verifications per month on its free plan. Verifalia resets 25 credits every 24 hours. For freelancers verifying a handful of addresses per week, any of these three is sufficient without ever hitting a paywall.

Is it safe to use a free email verifier on a purchased list? expand_more

Verification is safe (the tool checks the address without sending anything to it), but free tiers usually cap you at 100 to 600 verifications per month, which is rarely enough for a purchased list. For purchased lists above 2,000 addresses, pay for one-time PAYG credits. MillionVerifier at $4.90 per 2,000 credits and Bouncer at around $7 per 1,000 credits are the most cost-effective starter packs. Verify purchased lists before any sending, since high bounce rates from unverified lists damage your sender reputation faster than almost any other deliverability mistake.

About the author

Harsh Shah

Founder, Mailsfinder

Harsh founded Mailsfinder after running outbound for hundreds of B2B teams and watching the same gap repeat: tools that generate sends but not replies, SEO that generates traffic but not pipeline. He currently consults for ClickUp and three other B2B SaaS companies on pipeline-driven SEO and outbound, and previously led growth at Databox and Darwinbox. Across 50+ B2B SaaS engagements he scaled one platform from $2K to $50K MRR through organic search, drove 35% traffic lifts via content audits, and launched comparison pages with 22% conversion lift.

Expertise: Pipeline-driven SEO and AEO, first-principles outbound, B2B SaaS growth consulting, email deliverability, comparison and alternative page SEO

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