DeBounce Review: The Ladder, and What the Guarantee Excludes
The pricing page renders empty to a plain fetch because the ladder lives in its calculator script. Here it is, with what the accuracy guarantee leaves out.
DeBounce publishes a ten-rung credit ladder running from 15 dollars for 5,000 credits to 2,200 dollars for 5,000,000, with a 5,000 validation minimum and credits that do not expire. Its accuracy guarantee appears as four different percentages and its conditions exclude purchased or built lists.
Key takeaways
- The pricing page computes its figures in the browser, so a plain fetch returns nothing. The full ladder sits in the calculator script the page loads.
- Effective cost per check falls from 0.0030 dollars at 5,000 credits to 0.00044 at 5,000,000, a range of nearly seven times, so any quote is meaningless without the volume it was computed at.
- The guarantee is stated as 97 percent on the homepage and as 97.5, 95 and 98 percent across the guarantee page, and the figure that binds is the population-specific one matching your list.
- Guarantee eligibility requires an opt-in list the page says must not have been purchased from a third party, which removes most cold outbound, and the remedy is a small credit rather than a refund.
Reviewed and updated August 16, 2026
Searching for the name is the first obstacle. Type debounce into a search engine and most of what comes back is a JavaScript technique for rate-limiting function calls, which shares nothing with the email verification service beyond a word. Add a commercial term to the query and the results resolve cleanly onto the vendor, which is a small clue about the company's position: it is a real product in a crowded category, sitting under a name that a much larger technical vocabulary already owns.
This is a read of what DeBounce publishes on its own surfaces, verified against the bytes those pages serve, with attention to the two things buyers get wrong about the category: what the price actually is at the volume they will use, and what the accuracy guarantee excludes.
Where the price is published, and why the page looks empty
The pricing page presents a slider rather than a plan table, and a plain fetch of it returns no tier prices at all. The figures are computed in the browser by a script the page loads, and that script contains the whole ladder as a plain list, which makes it the most precise version of the vendor's own pricing that exists on the site.
The ladder published in that script runs from 5,000 credits at 15 dollars to 5,000,000 credits at 2,200 dollars, through rungs at 10,000 for 25, 25,000 for 45, 50,000 for 75, 100,000 for 135, 200,000 for 200, 500,000 for 450, 1,000,000 for 750 and 2,000,000 for 1,300. The same script sets a minimum of 5,000 validations, returning the message "The minimum number of validations is 5,000" below that, and directs anyone needing more than five million to contact support.
The floor of the ladder, and the entry price at $15
$135, a common single-purchase size
$750
$2,200, the top rung
Two details in that script matter for anyone comparing quotes. The unit rate moves by a factor of nearly seven across the ladder, so a quote sourced from a competitor's comparison page is meaningless unless it names the volume it was computed at. And the script reads a discount percentage from the page itself, which means the number a visitor sees during a promotion is not necessarily the number in the ladder. The vendor's marketing surfaces advertise "From $0.00045 per Check"; the top rung of its own ladder divides to about $0.00044, so the headline figure is, if anything, slightly conservative against the vendor's own arithmetic.
Credits do not expire and there is no monthly commitment on the pay-as-you-go shape, which is the structural argument for a verifier of this type over a subscription. A team verifying in bursts around campaign builds is buying capacity rather than renting it.
The guarantee is four different numbers
The homepage advertises a "97% Deliverability Guarantee". The dedicated guarantee page opens by promising a "97.5% (or better) deliverability rate guarantee", then immediately decomposes that into 95%+ accuracy on Microsoft accounts, naming Office 365, Hotmail, MSN, Outlook and Live, and 98%+ on everything else. Further down, the worked example that explains the remedy refers to "the guaranteed threshold of 97%+ accuracy rates for all other aspects".
Four figures for one promise, across two pages of the same site. None of them is hidden and none contradicts the others outright, since a blended 97.5 is consistent with a 95 floor on one population and 98 on the rest. The useful conclusion is that the number to hold the vendor to is the population-specific one that matches your list, not the headline. If your prospects sit largely on Microsoft tenants, which is common in enterprise B2B, the commitment that applies to you is the 95% one.
- Yes: A batch of at least 1,000 addresses, verified with DeBounce and sent within a 48-hour period
- Yes: The addresses were classified as Deliverable and Safe to Send
- Yes: The bounce was caused by an invalid, non-existing address
- No: The list is opt-in and collected by you, and the page states it must not have been purchased from a third party
- No: Bounces from sender reputation, blacklisted IPs, throttling, spam content or misconfiguration
- No: Spam traps, where the page states there is no guarantee for finding them
That fourth condition is the one worth stopping on, because it removes most cold outbound from the guarantee entirely. A prospecting list built or bought rather than opted into does not meet the stated criteria, whatever the verification results say. The guarantee is written for a marketer cleaning a house list, not for a team verifying a sourced prospect file, and reading it as coverage for the second is the mistake the headline invites.
The remedy is also narrower than a refund. The page describes crediting three percent of the validation credits for that list for every one percent the accuracy rate falls below the threshold, claimed through a feedback form within 30 days of the discrepancy. On a 100,000-address list bought at 135 dollars, a full percentage point of underperformance returns roughly four dollars of credits. The guarantee is a statement of confidence rather than a financial backstop, which is true of most guarantees in this category and is worth pricing at zero when comparing vendors.
The domains the vendor tells you it struggles with
The same page carries a set of disclosures that most competitors leave to a support article, and they are more useful than the guarantee itself.
Yahoo and AOL addresses under the deactivation process are excluded from the guarantee, with a recommendation to contact support before validating a list containing old addresses on those domains. GMX and WEB.de are validated by special methods that the page warns may still produce bounces above ten percent. And free.fr, orange.fr, sfr.fr, comcast.net and att.net are named as domains that will return a relatively large number of Unknowns.
For a B2B sender that list is mostly reassuring, since consumer domains are a small share of a business prospect file. For anyone sending into French or German markets, or into a list with a consumer tail, it is a concrete planning input: those addresses will come back unresolved and the decision about whether to send to them is yours rather than the tool's.
Where it sits against the alternatives
The category's economics are close enough that the choice rarely turns on unit price alone. What separates the options is the bundle around verification, the behaviour on accept-all domains, and whether you are buying credits or a subscription.
- Credits that do not expire suit bursty verification around campaign builds
- Unit rate falls steeply with volume, so the quote is meaningless without the tier
- No monthly floor to justify when a month is quiet
- Deliverability tooling, monitoring or enrichment sold alongside
- Worth paying for only if the adjacent products get used
- Priced against the bundle rather than against the per-check rate
Everything in this category runs into the same wall on accept-all domains, where a receiving server acknowledges any address and no external verifier can prove a mailbox exists. DeBounce sells a catch-all validator as a distinct capability, and the honest way to evaluate any such claim is against your own list rather than against a published accuracy figure. How MillionVerifier's result buckets read in practice and what ZeroBounce's bundle actually includes cover two of the common alternatives, and Emailable's verdicts and guarantee is the closest structural comparison to the guarantee described above.
The other half of the decision is what verification is for. It reduces invalid addresses, which is the part of a bounce rate you can control. It does not touch the other causes, and what a bounce rate is actually made of is the context that stops a verifier being blamed for a reputation problem or credited with fixing one.
How to run the test that actually decides it
The entry price makes a real evaluation cheap, and most buyers still skip it in favour of comparing published accuracy figures that no vendor computes the same way.
The test that settles it uses your own list and costs one rung of the ladder. Take a few thousand addresses from a recent build, ideally one you have already sent to, and verify them. Then compare the tool's verdicts against what your sending platform recorded: addresses it called deliverable that hard bounced are the errors that cost you a domain, and addresses it rejected that in fact replied are the revenue the tool quietly removed. Both directions matter and only the first gets attention. Pay particular attention to how the accept-all population is labelled, because that bucket is where the vendors genuinely differ and where the published figures tell you nothing.
Run the same file through a second verifier if the volume ahead justifies it. Where two tools disagree about a specific address, neither is necessarily wrong, and the disagreement rate itself is the most honest accuracy signal available to a buyer.
Who it fits
A team verifying in bursts, on B2B domains, that wants a per-check rate rather than a monthly commitment, and that is comfortable evaluating the accept-all behaviour on its own file. The non-expiring credits and the low entry price make it cheap to test properly, which is the right way to buy anything in this category.
It fits less well where the guarantee is the reason for buying, because the eligibility conditions exclude purchased and built lists, and where the list is heavy in the consumer domains the vendor itself flags as unreliable.
The short version
The published ladder runs from 15 dollars for 5,000 credits to 2,200 dollars for 5,000,000, with a 5,000 validation minimum and credits that do not expire. The unit rate moves nearly sevenfold across that range, so compare quotes at your own volume rather than at the headline.
The guarantee appears as 97, 97.5, 95 and 98 percent across two pages, and the figure that binds is the population-specific one that matches your list. Its eligibility conditions require an opt-in list that was not purchased from a third party, which excludes most cold outbound, and the remedy is a small credit rather than a refund.
Test the accept-all behaviour on your own file before committing volume, because that is the axis every verifier in the category is genuinely judged on and none of them publishes a number you can use. If the deeper question is whether the list itself is worth verifying, see what a first campaign produces.
Pricing and features verified as of August 2026. Verify current terms with the vendor before relying on them.
Frequently asked questions.
Frequently asked questions- How much does DeBounce cost?
- The ladder published in the pricing page calculator script runs from 15 dollars for 5,000 credits to 2,200 dollars for 5,000,000, with rungs including 135 dollars for 100,000 and 750 dollars for 1,000,000. The stated minimum is 5,000 validations, and the script also reads a discount value, so promotional prices can differ.
- Does the accuracy guarantee cover cold outbound lists?
- On the published conditions, no. The guarantee page requires an opt-in list that you collected and states it must not have been purchased from a third party, alongside a minimum batch of 1,000 addresses sent within 48 hours. A sourced prospecting file does not meet that description whatever the verification verdicts say.
- What does the guarantee actually pay out?
- Credits rather than money. The page describes adding three percent of the validation credits for that list for every one percent the accuracy rate falls below the threshold, claimed within 30 days. On a 100,000 address list bought at 135 dollars, a full point of underperformance returns roughly four dollars of credits.
- Which domains does the vendor say it struggles with?
- The guarantee page excludes Yahoo and AOL addresses under the deactivation process, warns that GMX and WEB.de may still bounce above ten percent despite special handling, and names free.fr, orange.fr, sfr.fr, comcast.net and att.net as domains that return a relatively large number of Unknowns.
About the author.
Tim Carden is CMO / CTO at RevenueFlow, which builds and operates outbound revenue engines for B2B companies. Studied at McGill University.
Tim Carden · CMO / CTO
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