Mailcheq vs Zerobounce vs NeverBounce: an honest 2026 comparison

By Andrej Užušienis · June 29, 2026 · 12 min read

We are new and small. Zerobounce and NeverBounce have been doing this for a decade and have customer lists you have heard of. There are very real reasons to choose either of them over us today. There are also real reasons to choose us. This article tries to lay out the honest picture, including the parts that do not flatter us.

The short answer

If you are validating 50,000+ addresses a month and you need granular policy controls (custom catch-all handling, abuse-account flags, role-account tiering, custom blocklists), use Zerobounce. They do this best.

If you are validating 10,000-50,000 addresses a month and you want the simplest API to integrate, use NeverBounce. Their developer experience is the cleanest in the category.

If you are validating fewer than 10,000 addresses a month, or you are price-sensitive on smaller batches, or you want to support a small operator over a big one, give Mailcheq a try. Our €19/month Starter plan covers 5,000 validations, and our €99/month Growth plan covers 50,000 — both well below Zerobounce and NeverBounce list pricing for the same volume.

Pricing comparison, 2026

Mailcheq is roughly 50-60% the price of either competitor at the 5K-50K monthly tier. The price gap closes at very high volume because we do not yet have the negotiated bandwidth and IP-pool spread that lets the larger players price aggressively at 500K+.

Accuracy: what "accuracy" actually means

Every vendor in this space claims 98-99% accuracy. The number is essentially meaningless without specifying:

• Against what reference set? Hard-bounce rate after a real send is the only honest benchmark, and almost no vendor publishes this against an independently-collected reference list.
• At what catch-all rate? A vendor that aggressively classifies catch-all domains as "valid" will look more accurate against typical inputs but will deliver more bounces in practice.
• For which mail provider? Microsoft 365 is essentially unverifiable in 2026 (anti-validation defences — see our explainer). Any vendor reporting binary verdicts on Microsoft-hosted addresses is misleading you.

Where each vendor is honest about limits

Latency

Single-address validation timings, July 2026, median across 1,000 sequential checks from a US-East datacenter:

We are slower for US-originated traffic because our edge is in Europe. We are roughly tied for EU-originated traffic. If you are a US-based sender doing real-time signup validation in the request path, the others are better. If you can afford 200-300ms extra latency or you batch, the gap is irrelevant.

Developer experience

Honest assessment: NeverBounce has the best developer documentation in the category. Their REST API is exactly what you would design from scratch, their error messages are useful, their dashboard is responsive, their webhooks work first time.

Zerobounce has the most feature surface — bulk file upload, scheduled validation, integrations with HubSpot/Salesforce/Mailchimp, abuse-list flagging, scoring tiers. The cost is some complexity: you will spend an afternoon learning the verdict-codes.

Mailcheq is the simplest. GET /api/validate?email=… returns a JSON document. That is the entire API right now. If your integration is "stick a check before write to the leads table" we are easiest. If your integration is "wire validation into a CRM workflow," NeverBounce is easier.

Where Mailcheq wins on substance

EU-hosted, EU-incorporated

Mailcheq is operated by ARENAMEDIA SP. Z O.O., a Polish limited company. Our infrastructure is on Hetzner servers in Helsinki and Falkenstein. If your compliance team has been frowning at US-based data processors since the Schrems II decision, we are the lowest-friction choice.

No log retention

We do not retain the addresses you validate. The validation result is calculated, returned, and the input is forgotten in the same request. Zerobounce and NeverBounce both retain validation history for diagnostics and re-billing — useful for them, fine for most customers, problematic for some.

The price

5,000 validations a month for €19 is not just cheaper than the competitors at that tier — it is cheaper than the rounding error on their billing cycles. Our 50K tier is roughly half theirs.

Where Mailcheq loses on substance

Volume

Above 100K validations a month, the larger players have better unit economics because they have negotiated bandwidth and they spread sends across hundreds of egress IPs. We have one egress region and a small IP pool. If you are doing 500K/month, ask us for a quote — but expect to hear the truth: get a quote from Zerobounce too.

Integrations

We have no HubSpot connector. No Mailchimp connector. No Salesforce connector. No Zapier app. Yet. The API is general enough that you can wire any of these up yourself in 20 lines of code, but if you wanted a one-click integration today, the others have it.

Track record

Zerobounce has been operating since 2015. NeverBounce since 2014. We launched the validator in April 2026 and the standalone Mailcheq brand in June 2026. If you need a vendor with a decade of operational history for procurement reasons, we cannot offer it yet. We can offer it eventually — we are building it now.

Bottom line

Mailcheq is the right choice if you are price-sensitive, you are EU-based or EU-compliance-driven, you value short-and-simple over feature-rich, and your volume is in the 1K-100K range. If any of those is wrong for you, the bigger players are better. We would rather you be a happy NeverBounce customer than an unhappy Mailcheq customer.

Try the verifier on this page or email hello@mailcheq.com for early API access.