TL;DR
- Emailable: 250 credits. Kickbox: 100 verifications. ZeroBounce: 100 a month, refreshed. NeverBounce: free test credits, amount not stated.
- Mail Exchange: a 3-day trial of 25 checks with a card on file (never charged), to keep the trial for real evaluations.
- None is enough for a full list. Use the free allowance as a blind test, not as a way to clean a list.
- ZeroBounce is the only one that refreshes monthly.
What you get
| Vendor | Free offer | Notes |
|---|---|---|
| Emailable | 250 credits for new accounts | Credits never expire |
| Kickbox | 100 verifications | Unknown results aren't charged |
| ZeroBounce | 100 validation credits a month | Also 1 inbox test, 10 finder credits |
| NeverBounce | Free test credits and free list analysis | Amount not stated on the page we read |
| Mail Exchange | 3-day trial, 25 checks | Name, email and a card on file; the card is never charged |
| BriteVerify | Not stated | Ask Validity |
How to use a small free allowance well
- Pick 100 addresses you already know the truth about: 50 you've emailed successfully and 50 that bounced.
- Add 25 tricky cases: catch-all domains, role addresses (info@), a disposable domain, a recently left employee.
- Compare the categories each tool returns. A good tool flags the tricky ones as risky or unknown instead of guessing.
- Run the larger blind test described in how to test an email verifier once you've shortlisted.
Why we ask for a card
Mail Exchange's trial requires a card on file and gives 25 checks over 3 days. Verification costs real compute and network time, and open free offers attract repeated signups. The card is never charged for the trial, and we don't accept prepaid cards or a second trial on the same card. If you need a larger test, ask us.
Which free tier is best?
- Biggest one-off sample: Emailable (250).
- Ongoing small needs: ZeroBounce (100 a month).
- Quick tests with a tricky-case set: any of them.
FAQ
Which email verifier has the best free plan?
Emailable gives the largest one-time allowance (250 credits); ZeroBounce is the only one that refills monthly (100).
Can I clean a whole list for free?
No. Free allowances are for evaluation. Cleaning a list needs a paid pack.
Why does Mail Exchange need a card for the trial?
To prevent repeat and automated signups. The card isn't charged.
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