A starter allowance is a trial, not a free plan. It lets you test the upload flow and the results on a sample, and then any real list needs paid credits. NeverBounce publishes its current allowance and prices on neverbounce.com, so read them there in a browser on the day you sign up. The NeverBounce pricing page explains how its pay-as-you-go and Sync options are shaped.
A free tier that renews works differently. You get a fresh batch of checks each month, which is enough to verify new signups or a weekly lead import without paying. Across 16 vendors read on 24 September 2026, only ZeroBounce, emailverify.io and Hunter renewed their free credits each month. ZapBounce renews too: 100 checks a month, every month, with no card.
Use the free credits for a fair test, not a demo. Pull 100 real addresses from the list you plan to send, including some from company domains. Run the same 100 through each verifier and write down three counts: valid, catch-all and unknown. The verifier that leaves fewer rows unresolved on your own list is the one that's worth paying for.
NeverBounce's result codes are public in its developer docs: valid, invalid, disposable, catchall and unknown (developers.neverbounce.com, read 24 September 2026). ZapBounce returns four results, valid, invalid, catch_all and unknown, with role and disposable as separate flags. The accept-all meaning page maps one vocabulary onto the other.
Once the free checks run out, ZapBounce charges $5 for 1,000 and $25 for 10,000, with no minimum order. Credits never expire, and unknown results and duplicates are never billed. ZapBounce vs NeverBounce sets the two side by side.
Related questions
Can I use NeverBounce for free forever?
No. NeverBounce's free credits are a starter allowance, and ongoing use means buying pay-as-you-go credits or a Sync subscription. ZapBounce's free tier renews every month with 100 checks and needs no card.
Does NeverBounce have a free email verifier?
NeverBounce gives new accounts free credits to try its verifier, with the terms on its own help pages. ZapBounce has a free single-address verifier on its site and 100 free list checks a month.
Which email verifiers give free checks every month?
ZeroBounce, emailverify.io and Hunter renewed their free credits monthly when 16 vendors were read on 24 September 2026. ZapBounce also renews its free tier every month, with 100 checks and no card.
What is NeverBounce Sync?
Sync is NeverBounce's subscription option, sold beside its pay-as-you-go credits. ZapBounce offers the same two shapes: pay-as-you-go from $5 for 1,000 checks, or a monthly plan at 15% less.