Is ZapBounce more accurate than MailTester Ninja?

Compare coverage before accuracy. On accuracy, MailTester Ninja's entry reads: Not stated as a percentage on its homepage. Vendor accuracy claims in this market are calculated after unknown and catch-all addresses leave the denominator. ZapBounce reports coverage, the share of the list with a definite verdict, so the rest is visible, labeled and never billed.

Why switch from MailTester Ninja to ZapBounce?

Credits bought per address, so you pay for the checks you run rather than for daily capacity. One price table: $5 for 1,000, $25 for 10,000 and $139 for 100,000, with no subscription to keep active. Unknown results and duplicate rows are never charged, and the pricing page says so. Credits never expire, and 100 free credits arrive every month with no card. Our own SMTP check on port 25, closed before DATA, so no message reaches the addresses you check.

ZapBounce vs MailTester Ninja

MailTester Ninja sells verification and email finding as a subscription key with a daily cap. ZapBounce sells verification per address, from $5 for 1,000 checks, with credits that never expire and a price per address rather than per day. Your usage pattern decides it: a steady daily flow, or lists that arrive in bursts.

	ZapBounce	MailTester Ninja
Accuracy reporting	Coverage stated: the share of your list with a definite verdict	Not stated as a percentage on its homepage
1,000 addresses	$5	See their pricing page
10,000 addresses	$25	See their pricing page
100,000 addresses	$139	See their pricing page
Free tier	100 a month, no card	See their pricing page
Credit expiry	Never	See their pricing page
Billed for unknowns	No	Not stated

MailTester Ninja prices change, so confirm theirs on their own pricing page. Ours are fixed and published on /pricing.

How MailTester Ninja prices it

MailTester Ninja prices by the day: Starter, Pro and Ultimate each set a daily verification cap, and more keys raise it (read September 2026). You pay for that capacity whether you use it or not, and the key stays live only while the subscription does. ZapBounce charges per address, from $5 for 1,000, and bought credits never expire.

Why teams pick ZapBounce over MailTester Ninja

What changes when your list runs through ZapBounce instead.

The short version

Credits bought per address, so you pay for the checks you run rather than for daily capacity.
One price table: $5 for 1,000, $25 for 10,000 and $139 for 100,000, with no subscription to keep active.
Unknown results and duplicate rows are never charged, and the pricing page says so.
Credits never expire, and 100 free credits arrive every month with no card.
Our own SMTP check on port 25, closed before DATA, so no message reaches the addresses you check.

Moving off MailTester Ninja

MailTester Ninja sells a daily cap per key, and requests above it are refused until the quota resets the next day. That's fine for a steady drip and awkward for a big import, which you split across days or cover with extra keys. ZapBounce sells credits per address, so you buy for the list in front of you, not for a daily allowance.

Swap your MailTester Ninja key for a ZapBounce API key and point your requests at POST /v1/verify. For lists you ran through its bulk app, upload the CSV to ZapBounce instead. Each row returns valid, invalid, catch_all or unknown with a reason and a billed flag, and your subscription can lapse whenever it suits you.

The hard addresses, and how they come back

Catch-alls, Yahoo, cloud blocks and traps

Addresses from a finder often land on catch-all domains, where the server answers 250 for everyone. ZapBounce sends one probe to a random address at the domain, labels the row catch_all and bills it once, so those contacts can go to their own slower sequence.

Found contacts at Yahoo- or AOL-hosted companies come back unknown, because those servers accept every recipient to block enumeration. ZapBounce names that reason on the row and bills nothing for it.

A big import never hits a daily ceiling: POST /v1/batches takes up to 100,000 addresses in one job, and results page out through a cursor until has_more turns false.

Pristine spam traps look like working mailboxes on the wire, so no SMTP answer separates one from a real inbox. Where a found contact came from still matters as much as its verdict.

Questions people ask about MailTester Ninja

What happens when I hit MailTester Ninja's daily limit?

MailTester Ninja's subscription page says requests above the plan limit are refused with a message and the quota resets the next day (read September 2026). ZapBounce sells credits per address rather than daily capacity, so what you buy waits until the list arrives.

Can I find emails in MailTester Ninja and verify them in ZapBounce?

Yes. Export the found addresses as a CSV and upload them, or call the ZapBounce API as each contact is found. Unknown results and duplicates cost nothing.

Do ZapBounce credits stop working if I pause?

No. ZapBounce credits never expire and need no subscription behind them, so a list you check next quarter uses what you bought today.

Is ZapBounce cheaper than MailTester Ninja?

Ours is $5 for 1,000 and $139 for 100,000, published, with no minimum. Credits never expire, and unknowns and duplicates are never billed, so the rate you see is the rate you pay.

Can I test both before deciding?

Yes, and you should. Run the same sample of a few thousand addresses through each and compare how many came back unresolved. That difference matters more than either accuracy claim.

Add up the days you ran MailTester Ninja near its cap last month, then price your real volume at $25 for 10,000 checks, bought per address.

Run the same sample through us and MailTester Ninja

100 free checks a month, no card, and the unknowns come back labeled.

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