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We help developers stop spam signups without the hassle

Tired of fighting fake accounts? We've turned email verification from a pain into a simple API call. No more building and maintaining complex filters - just reliable detection of disposable email addresses so you can focus on building cool stuff.

Developer at work

Our mission

We believe stopping spam shouldn't be hard. That's why we built UserCheck - a simple API that tells you if an email address is temporary or disposable.

Instead of everyone building their own solution, we do the heavy lifting. Our systems watch for new disposable email services, analyze how they work, and keep our database current. One API call gives you access to all of this.

Websites Protected
10,000+
Domains Checked Daily
100,000+
API uptime
99.99%

What we believe in

Here's how we try to do things at UserCheck:

It Just Works
Our API runs on multiple regions with failover. We handle the complex stuff so you don't have to worry about it.
Keep It Simple
Clean docs, straightforward pricing, and an API that does one thing really well. No feature bloat.
No Secrets
We're open about how things work and what we're building next. When things break (they sometimes do), we tell you why.
Privacy First
We only store what we absolutely need. Your data never gets sold or shared. Simple as that.
Stay Ahead
Spammers don't sit still, so neither do we. We're constantly updating our detection to catch new disposable email services.
Listen & Learn
The best ideas come from our users. We're developers too, and we build what we'd want to use ourselves.
Programmer at work

Want to help?

We're a small team trying to make the internet a bit less spammy. If you're into building tools that help other developers and care about doing things the right way, we'd love to chat.