Is ZapBounce more accurate than Allegrow?

Compare coverage before accuracy. On accuracy, Allegrow's entry reads: A percentage from its own test, published on its own site. 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 Allegrow to ZapBounce?

Published prices on one page: $5 for 1,000, $25 for 10,000 and $139 for 100,000, with no plan required. Verification sold on its own, per address, with no monthly platform fee underneath it. 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 Allegrow

Allegrow bundles verification into a monthly plan, starting at $99 on Starter, with $8 per extra 1,000 checks. ZapBounce sells the checks on their own, from $5 for 1,000, with no plan and no expiry. The real question is whether you want a subscription or a price per address.

	ZapBounce	Allegrow
Accuracy reporting	Coverage stated: the share of your list with a definite verdict	A percentage from its own test, published on its own site
1,000 addresses	$5	$8 per 1,000 add-on credits
10,000 addresses	$25	$8 per 1,000 add-on credits, on a plan from $99 a month (Starter)
100,000 addresses	$139	$8 per 1,000 add-on credits; Scale Plus Unlimited $1,340 a month
Free tier	100 a month, no card	A free trial, listed on its plans page
Credit expiry	Never	Not published
Billed for unknowns	No	Not stated

Allegrow figures read from their own pricing page in September 2026.

How Allegrow prices it

Allegrow's price is a monthly plan first and a per-check price second: $99 a month for Starter, $1,340 a month for Scale Plus Unlimited, and $8 per 1,000 add-on credits on top. ZapBounce sells the credits on their own. You buy $25 for 10,000 or $139 for 100,000 when a list arrives, and the credits wait until the next one.

Why teams pick ZapBounce over Allegrow

What changes when your list runs through ZapBounce instead.

The short version

Published prices on one page: $5 for 1,000, $25 for 10,000 and $139 for 100,000, with no plan required.
Verification sold on its own, per address, with no monthly platform fee underneath it.
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 Allegrow

Most people who leave Allegrow wanted a list cleaned, not a platform. The Starter plan is $99 a month before a single extra check, and every 1,000 beyond the plan's allowance costs $8 as an add-on. If you clean a list once a quarter, you're paying for the months in between.

Moving is a file export and an upload. Pull your last cleaned list out of Allegrow as a CSV, send it through ZapBounce's bulk upload, and your original columns come back with the result, the reason and a billed flag on every row. Cancel the Allegrow plan at the end of its billing month, since nothing on our side depends on it.

The hard addresses, and how they come back

Catch-alls, Yahoo, cloud blocks and traps

Catch-all domains are where Allegrow puts its marketing, so start there. An accept-all server answers 250 for every address, real or random. ZapBounce proves that with one probe to a random address at the same domain, returns the row as catch_all, bills it once and stops there.

Allegrow describes its catch-all method as signal-based, with no test sends (its own use-case page, read 24 September 2026). Signals outside the SMTP answer give you a score, and a score is worth weighing on its own terms. On ZapBounce you get the literal server code on every row, so you always know which rows had a mailbox answer.

Yahoo and AOL accept every recipient on purpose to stop address harvesting, and Gmail and Microsoft 365 throttle probes from cloud ranges. ZapBounce returns those rows as unknown with the reason attached, and an unknown is never billed.

Pristine spam traps look like working mailboxes on the wire. No SMTP answer tells one apart, whichever plan you're on, so list hygiene at the source still matters.

Questions people ask about Allegrow

What do 10,000 checks a month cost on Allegrow and on ZapBounce?

At 10,000 a month, Allegrow's Starter plan is $99 plus add-on credits at $8 per 1,000 beyond its allowance. ZapBounce charges $25 for 10,000 checks, with no plan and no minimum. Unknowns and duplicate rows are never billed, so the $25 is the ceiling.

Does Allegrow send test emails to catch-all addresses?

Allegrow's own catch-all page describes a signal-based process with no test sends (read 24 September 2026). ZapBounce also sends no message: its SMTP check on port 25 closes before DATA, and a catch-all domain comes back labeled catch_all from one extra probe.

Can I keep Allegrow for inbox placement and use ZapBounce for list cleaning?

Yes. ZapBounce needs no plan or contract, so you can run bulk files or API checks through it on the same lists. You buy credits only when a list needs cleaning, starting at $5 for 1,000.

Is ZapBounce cheaper than Allegrow?

At 100,000 addresses we list $139 and they list $8 per 1,000 add-on credits; Scale Plus Unlimited $1,340 a month. Compare the per-address rate rather than the headline, and check what each side does with unknowns: ours are never billed.

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.

Set Allegrow's $99 Starter plan beside ZapBounce's $25 for 10,000 checks, then look at how often your lists really need cleaning.

Run the same sample through us and Allegrow

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

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