BillionVerify vs CleanMyList: a known allowance beats a cheaper unknown

You exported a list from last spring’s webinar, loaded it into your email tool and sent a campaign. Two days later the bounce count is ugly and your sender reputation is taking the hit. Both of these tools exist to stop that, and both are sold as lifetime deals on AppSumo.

We haven’t used either one, so everything below comes from the listings. Neither has a demo video, which means much of it is the vendors describing themselves.

The allowance question decides this one

The biggest difference isn’t a feature. It’s that CleanMyList tells you what you’re buying and BillionVerify doesn’t.

CleanMyList’s $79 tier includes 20,000 verifications every month. The $199 tier gives 60,000 and the $399 tier gives 120,000. You can see the number, do the maths against your own lists, and decide.

BillionVerify has two tiers, $49 and $98, and the listing gives no monthly credits, no total verifications and no API cap for either. For a product priced per email, that’s the one number you need. We’d treat it as a blocker until the seller answers in writing.

There is a hint. Both BillionVerify tiers let you stack up to 5 codes, which suggests each code adds capacity. That’s an inference, not something the listing says.

What each tool checks and how it reports

BillionVerify lists the standard stack on every request: syntax validation, DNS and MX lookup, SMTP mailbox confirmation, disposable email detection, role account flags like info@ and support@, catch-all detection and spam trap screening. The SMTP step matters most, since it asks the receiving server whether the mailbox exists. Catch-all domains get a score rather than a plain good or bad label, though the listing doesn’t show how that score appears.

CleanMyList sorts every address into deliverable, risky or undeliverable, and each verdict comes with a reason you can inspect. Catch-all domains land in the risky bucket. We like this approach for a small business. If a risky address belongs to a real customer, you can see why it was flagged and keep it.

CleanMyList doesn’t list its individual checks the way BillionVerify does. It says deliverable means passing the available checks, which is vague. So BillionVerify is clearer about what runs under the hood, and CleanMyList is clearer about what you see afterward.

Integrations and developer use

This is where BillionVerify has the stronger story, at least on paper. The API returns structured JSON in under 200ms for cached results and 1 to 3 seconds for a full SMTP check, with SDKs for Python, Node.js, Go and PHP. There’s also an MCP server for Claude and Cursor, and the listing gives no detail on how it behaves.

A 1 to 3 second check is fine in the background but awkward if someone is waiting on a signup form. You’d probably verify after submission instead of blocking the button.

CleanMyList leans toward people who don’t write code. You can import contacts from a connected tool, verify them and push selected results back, which skips the usual CSV round trip. It also keeps a searchable, deduplicated master contact database with references to source lists. The listing doesn’t say how many contacts it holds or whether stored contacts count against your allowance. It offers an API too, but gives no speed figures or SDKs.

Both listings are messy on integrations:

• BillionVerify names four on AppSumo (HubSpot, Integrately, Zapier, n8n) but its FAQ claims 25+ native connectors including Mailchimp, SendGrid, Klaviyo and Salesforce.
• CleanMyList’s header names five tools, one feature section names a different five, and the FAQ lists twelve, including Mailchimp, Brevo, ActiveCampaign and beehiiv.

In both cases the longest list is probably the most complete, but confirm your tool before paying. CleanMyList also warns that some providers need a paid plan for API access, and MailPoet needs a companion WordPress plugin.

Price and tier limits

BillionVerify costs $49 or $98, with a 60-day redemption window and stacking up to 5 codes. The listed prices of $0.00 are a data quirk, so ignore them.

CleanMyList costs $79, $199 or $399, with a 60-day activation window. You can switch between the three tiers later, and there’s no stacking. Only the two higher tiers get the priority verification queue, and the listing doesn’t say how slow the standard queue is.

The catch with CleanMyList is that the allowance resets monthly and doesn’t roll over. Clean one big list per quarter and you’ll use a fraction of what you paid for. Rescue, which looks for replacement addresses, and enrichment both run on separately bought credits, as does any verification beyond your allowance. The listing doesn’t give that credit price, so heavy use has an unknown cost.

BillionVerify’s own FAQ puts pay-as-you-go at $10 for 10,000 emails, against $50 at NeverBounce, $60 at Emailable and $129 at ZeroBounce. That’s useful context. If you only clean a list once or twice a year, neither lifetime deal is likely to beat paying per use.

Claims that don’t add up

BillionVerify’s listing contradicts itself in a few places. Accuracy is stated as 99.9% with no method behind it. Bulk speed is given as 50,000 emails per hour in one answer and about 100,000 in another. The batch API takes 1,000 emails per request while dashboard uploads are called unlimited. None of that proves the product is weak, but it reads like a listing written in a hurry. It also gives no company history, customer count or uptime record.

CleanMyList is more restrained. It publishes no accuracy figure, which is honest but unhelpful, and it says plainly that verification can’t guarantee inbox placement. AppSumo shows 3 reviews, all five stars. That’s too thin a sample to lean on.

BillionVerify offers 100 free credits with no card, which is the sensible way to test it. Run a small, messy sample from your own list and see how it labels the risky addresses. The CleanMyList listing mentions no free trial.

Which one to buy

If you clean lists every month and your email tool is on the integration list, CleanMyList is the easier call. You know the allowance, the results explain themselves, and you can start at $79 and move up only if you hit the cap. Just don’t buy it for a once-a-year scrub.

BillionVerify suits developers and agencies who want verification wired into signups or enrichment flows. Use the free credits first, get the tier allowance in writing, and buy a single $49 code before stacking anything. Until that number is confirmed, it’s the riskier of the two.