MailboxValidator vs Verifalia
An independent, review-free comparison compiled by the SaaSTracker editorial team. Both products are profiled in full, and neither can pay for placement here.
The short answer
Both sides assessedMailboxValidator compared with Verifalia
The two long-lived developer-first verifiers, and Verifalia is the stronger product. It has configurable quality levels, more than forty status codes, retention settable to five minutes, non-expiring credit packs, and it actively chases provider changes at Yahoo rather than declining the domain. MailboxValidator answers with more SDK languages, a forever-free API tier, published processing times, and a cheaper million-address bulk price. Take Verifalia for depth and safety, MailboxValidator for cheap volume and language coverage.
Verifalia compared with MailboxValidator
Two small, long-lived, developer-oriented verifiers with strong API stories. MailboxValidator is a Malaysian company running since 2013, with a flat published price table and separate bulk and API plans, but it warns it cannot validate Yahoo addresses at all and its bulk credits expire after 30 days. Verifalia is older, offers quality levels and non-expiring packs, and actively chases Yahoo's changes rather than declining the domain. Verifalia is the stronger product; MailboxValidator is easier to price at a glance.
Choose MailboxValidator if
Developers and small technical teams who want a cheap, long-lived, no-nonsense validation API with SDKs in their own language, a free tier that never ends, and a flat published price table, and whose lists are B2B or non-Yahoo enough that the provider gap does not matter.
Choose Verifalia if
Developer-led teams and long-lived European businesses that want fine-grained control over verification depth, detailed status codes rather than a bare verdict, configurable data retention, and a vendor with twenty years of continuous operation and a real EU legal entity behind it.
Side by side
13 attributes| Attribute | MailboxValidator | Verifalia |
|---|---|---|
| Category | Verification | Verification |
| Starting price | $0 for 300 API queries a month or a 100-query bulk trial, then $19.95 for 1,000 bulk queries (free plan available) | $0 for the Free plan with 25 credits a day, then $9 per month for Starter (free plan available) |
| Pricing model | Two entirely separate products with separate ladders: prepaid bulk plans valid for 30 days with published processing times, and monthly API subscriptions with auto-renewal and auto-recharge including a permanently free tier. No refunds on either. | Two stacked mechanisms: subscription plans that grant a fixed number of free credits every day and unlock premium account features, plus non-expiring credit packs from 500 to ten million that are consumed only after the daily allowance runs out. Credit cost per verification varies by quality level: 1 for Standard, 2 for High, 4 for Extreme. |
| Free plan | API-FREE gives 300 queries a month indefinitely with standard support. An invitation-only API-FREE+ plan doubles that to 600. | Free plan forever: 25 credits per day, unlimited additional verifications through purchased credit packs, 5 classification override rules. |
| Free trial | A free bulk trial plan with 100 queries, plus a permanently free API plan with 300 queries per month | No time-limited trial; the permanently free plan with 25 credits a day is the evaluation path |
| Best for | Developers and small technical teams who want a cheap, long-lived, no-nonsense validation API with SDKs in their own language, a free tier that never ends, and a flat published price table, and whose lists are B2B or non-Yahoo enough that the provider gap does not matter. | Developer-led teams and long-lived European businesses that want fine-grained control over verification depth, detailed status codes rather than a bare verdict, configurable data retention, and a vendor with twenty years of continuous operation and a real EU legal entity behind it. |
| Setup time | Minutes for both paths. The free bulk trial needs only an upload, and the free API plan plus a language SDK gets a working integration inside an afternoon. Roughly twenty integrations are positioned as five-minute connections. | Minutes for a manual list clean through the client area. An API integration is a short job given the published SDKs, and the embeddable widget requires no code at all, which makes it the fastest path for protecting marketing forms. |
| Learning curve | Very low technically. The important learning is commercial: understand the 30-day credit expiry, the no-refund policy, and the Yahoo and ASCII limitations before purchase, because all four are the kind of constraint that only hurts after you have paid. | Moderate, and the highest of any verifier profiled here. The four-way classification is standard, but quality levels, forty status codes, custom classification schemes, override rules, and per-request retention settings are all genuinely new concepts. That depth is the product; expect to spend an hour reading before you configure anything beyond defaults. |
| Platforms | Web portal for bulk uploads, REST API returning JSON or XML, SDKs for Node.js, Ruby, PHP, Perl, Python, Java, .NET, Go, Rust, Kotlin, and Scala, Platform extensions, Zapier and Make | Web client area, REST API, SDKs for .NET, Go, Java, JavaScript, PHP, and Ruby, Embeddable JavaScript form widget |
| Compliance | No certifications published, No message sent to recipients during validation, Uploaded lists stated never to be shared | GDPR (EU-based controller and processor), TLS 1.3 in transit, TOTP multi-factor authentication, Configurable data retention from 5 minutes to 30 days |
| Founded | 2013 | 2005 |
| Headquarters | Bayan Baru, Penang, Malaysia | Vigonza, Italy |
| Ownership | Privately held and independently operated | Privately held and self-funded; Verifalia is operated by Cobisi Research |
Strengths and limitations
MailboxValidator
Strengths
- The widest SDK coverage of any verifier here, with maintained modules for Node.js, Ruby, PHP, Perl, Python, Java, .NET, Go, Rust, Kotlin, and Scala.
- A permanently free API plan of 300 queries a month, which is not a trial and makes the service a viable default for a small application.
- One of the cheapest published high-volume rates anywhere, at $199.95 for 100,000 and $699.95 for a million addresses.
- Around twenty named integrations including Zapier, Make, Mailchimp, HubSpot, SendGrid, Mailjet, Intercom, ChatGPT, and an MCP connector, which is a lot of surface for a very small company.
Limitations
- Yahoo addresses cannot be validated at all, which is a serious functional gap on any consumer list and something no competitor profiled here shares.
- Non-ASCII addresses are marked as invalid syntax rather than validated, so internationalised addresses are effectively unsupported.
- Bulk credits expire 30 days after purchase, by far the shortest expiry in the category, and there are no refunds under any circumstances.
- Processing is slow at volume by published admission, up to 72 hours for a million addresses.
Verifalia
Strengths
- Configurable quality levels are a genuinely useful and honestly priced idea: buy more retries only for the addresses that need them, at two or four credits instead of one.
- More than forty distinct status codes make reports diagnostic rather than merely classificatory, and the classification scheme itself can be redefined per account.
- Twenty years of continuous operation as a self-funded Italian company with more than 100,000 customers, which is unmatched longevity in a category full of three-year-old vendors.
- The best developer surface here: open-source SDKs for six language ecosystems, per-request configuration of quality, timeout, deduplication, retention, and callbacks, plus a no-code embeddable widget with CAPTCHA support.
Limitations
- No catch-all resolution. Accept-all servers are detected and classified as risky, and extra quality passes do not help, because the problem is a server that answers yes by design rather than a temporary failure.
- Subscription plans meter credits daily and unused credits expire at midnight UTC, which makes them a poor fit for a bursty one-off clean and forces pack purchases for project work.
- There is no single fixed published price ladder; pack prices render dynamically per currency, which makes cross-vendor comparison more effortful than it should be.
- No SOC 2 Type 2 or ISO 27001 report is advertised, despite a strong technical security posture, so certification-driven procurement processes will hit a wall.
Pricing compared
MailboxValidator
Two entirely separate products with separate ladders: prepaid bulk plans valid for 30 days with published processing times, and monthly API subscriptions with auto-renewal and auto-recharge including a permanently free tier. No refunds on either.
- Bulk trial$0
- Bulk plans$19.95 to $699.95
- Free API$0
- Paid API plans$29.95 to $339.95
MailboxValidator is excellent value for a developer and questionable value for a marketer. The forever-free 300-query API plan, eleven language SDKs, roughly twenty integrations, and a $0.0007 per-address bulk rate at a million are all genuinely strong for a company of a handful of people trading since 2013. But the terms attached to that price are the harshest in the category: credits expire in 30 days, refunds do not exist, and the service cannot validate Yahoo addresses at all or handle non-ASCII ones. On a B2B list processed promptly, none of those matter and the price is superb. On a consumer list bought ahead of a project that slips, you can lose the whole purchase and still have an unvalidated Yahoo segment. Price this as a cheap, capable tool with sharp edges, and only buy credits you are certain you will spend this month.
Verifalia
Two stacked mechanisms: subscription plans that grant a fixed number of free credits every day and unlock premium account features, plus non-expiring credit packs from 500 to ten million that are consumed only after the daily allowance runs out. Credit cost per verification varies by quality level: 1 for Standard, 2 for High, 4 for Extreme.
- Free$0
- Starter$9
- Professional$49
- Enterprise$199
- Ultimate$499
Verifalia offers more control per dollar than anything else in this category, and the value depends entirely on whether you want that control. On raw price it is competitive rather than cheapest: roughly $0.001 per Standard credit on a well-used plan sits near MyEmailVerifier and Truelist and well under Kickbox or Scrubby. What you get on top is a dial for verification depth, forty-plus status codes, retention settable to five minutes, sub-users with certificates and throttling, six open-source SDKs, and a bot-protected form widget, from a company that has been trading since 2005 without outside capital. For a developer-led team or a reseller that is exceptional value. For a marketer who wants to drag a CSV into a box and get a clean file back, most of it is machinery they will never touch, and a simpler vendor at a similar price will feel better. The one thing no amount of money buys here is catch-all resolution, and that is the question to settle before anything else.
Editorial verdict on each
MailboxValidator
MailboxValidator is a small, honest, long-lived tool that is very good at a specific job and openly bad at several others. Eleven language SDKs, roughly twenty integrations, a permanently free 300-query API plan, and a $0.0007 per-address bulk rate at a million make it one of the best developer-facing options in the category, and the published processing times and openly documented limitations are more candour than most vendors manage. But the limitations are real and unusual: no Yahoo validation at all, no non-ASCII support, credits that expire in 30 days, no refunds, and no catch-all resolution. Those are not deal-breakers for a B2B list processed promptly by a technical team, and they are close to disqualifying for a consumer newsletter or an occasional buyer. Run the provider census on your own list first. If Yahoo is a rounding error and you will spend the credits this month, this is a bargain with excellent tooling. If not, MyEmailVerifier or EmailListVerify does the same work with none of the sharp edges.
Read the full MailboxValidator profileVerifalia
Verifalia is the verifier for people who want to configure something rather than click a button. The quality-level dial is the best idea in the category that nobody else has copied: instead of accepting an unknown or paying a flat premium, you spend two or four credits only on the addresses a single pass could not settle. Around that sit forty status codes, a redefinable classification scheme, retention settable to five minutes, sub-users with certificates and throttling, six open-source SDKs, and a bot-protected form widget, all from a self-funded Italian company that has been trading since 2005 and posts publicly when a provider breaks its verification. It is also cheap, at roughly a tenth of Kickbox per address on a well-used plan. Two caveats decide whether it fits. It will not resolve catch-all domains, so B2B outbound teams whose value sits in that bucket should look elsewhere. And the daily-credit plan structure suits a steady flow rather than a one-off clean, for which you should buy a pack instead. For a developer-led team that wants control and longevity, this is the strongest all-round choice here.
Read the full Verifalia profileMailboxValidator profile last reviewed 2026-08-22; Verifalia last reviewed 2026-08-22. Pricing is compiled from public sources and can change without notice. See our methodology.