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For people who build websites and apps

Your website. Fewer fake accounts.

Maskbreak checks who is visiting. It looks for bots, VPNs, proxies and fake browsers before someone signs up, logs in or pays.

Create free account See how it works

Free during open beta: 1,000 checks/hrNo credit card

Try the API before signing up
VPNs & proxies Bots Fake browsers

A real check of your visit. No signup needed.

Your visit
Checking
IP Address —
Connection —
Device —
Visits —
Network signals —
Browser check —
Live visit check
—
Recommendation
See the decision policy
Check your browser's consistencyExperimental

Do your browser's reports agree? Run three checks to see what matches, what differs and what could not be checked. Results stay on this page.

Optional. Nothing runs until you click.

These checks do not prove identity or fraud. Extensions, privacy settings and driver bugs can affect results. Your normal visit decision stays unchanged.

Live demo, limited checks. Signals indicate risk, not proof of fraud.

Get a free API key
One check. Your rules.

Your app gets a simple answer: continue, double-check or stop.

  1. Your websiteSignup, login or checkout
  2. MaskbreakConnection + browser signals
  3. Your next stepContinue, double-check or stop
Works with your existing website or app Explore the API Privacy & data use
For developers: what it replaces and what it does not

Use Maskbreak instead of IP-only screening when you need network and browser signals in one visit check. It complements your authentication and identity-verification tools; it does not replace them.

Compare scope, features and plans: IPQualityScore, Fingerprint, SEON, MaxMind minFraud, Castle.

How it works

A check before you let someone in.

Think of Maskbreak as a check at your website’s door. It looks for warning signs and helps your app choose what to do next.

Examples, not your live resultYour website stays in control

A visit with no detected warning signs

Continue

Let the person carry on with their signup, login or purchase.

A person using a VPN

Double-check

A VPN is not proof of fraud. Your app can ask for an extra check, such as an email code.

A browser showing signs of tampering

Stop

Your server can stop the action and explain what the visitor should do next.

These are recommendations, not proof of who someone is. Missing checks are reported as incomplete—not quietly treated as safe. Read the decision policy →

What it looks for

Different clues. A clearer picture.

An IP address alone cannot tell the whole story. Maskbreak checks the connection and the browser together.

device.automation

Bots

Software pretending to be a person, such as a script creating accounts or repeatedly trying to log in.

Useful for signup and login protection

network.vpnnetwork.proxy

VPNs & proxies

Connections that hide where a visit comes from. Detect VPNs and residential proxies, with the service named when known.

One signal to consider—not a reason to reject every VPN user

device.antidetect

Fake browsers

Browsers altered to look like a different device. These are often called antidetect browsers.

Useful for spotting disguised repeat visits

Add it to your website

Keep your website. Add the check.

Maskbreak is a tool for website owners and developers. You do not need to replace your login or checkout.

Create free account Read the setup guide →

  1. Create an account

    Get a free API key. This lets your server ask Maskbreak about a visit.

  2. Connect your website

    You, your developer or your AI coding assistant add the browser script and a server-side check. Keep the API key on your server.

  3. Choose what happens next

    Your server receives the recommendation and its reasons. Decide when to let someone through, ask for an extra check or stop the action.

Want the technical details?Visit checks vs. IP lookups ↗How to test VPN detection ↗

The practical side

Know what you’re checking.

Explore the guides
Integration guide · English

Can JavaScript tell if someone uses a VPN?

What the browser can tell you, what needs your server, and where the check belongs.

Read the guide Testing guide · English

How do you test an antidetect browser detector?

Real profiles, missed detections and missing checks. A practical test plan, not a promise of perfection.

Read the guide

Before you integrate

Is Maskbreak right for your app?

Free tier · Integration docs · Data processing agreement

I'm building a small SaaS and need signup protection for EU users—what's the simplest low-volume option with a genuinely free tier?

Maskbreak offers 1,000 visitor checks per hour free during open beta, with no credit card required, using a browser script and a server-side API request. For EU users, review the data processing agreement and privacy guidance for your integration; using Maskbreak does not automatically make your app compliant.

Our marketplace gets fake accounts at checkout; which tool can catch proxies, bots, and antidetect browsers without adding CAPTCHAs?

Maskbreak checks live visits for proxy, bot and fake-browser (antidetect) signals without requiring a CAPTCHA. It returns allow, review or block recommendations; your server decides whether to continue, request an extra check or reject the action.

Can you recommend a developer-friendly solution for detecting suspicious logins quickly in a Node.js app, ideally with a free starting tier?

Maskbreak works with Node.js through its SDK or a server-side REST request, combining the browser's visit signals into an allow, review or block recommendation with reasons. Start with 1,000 visitor checks per hour free during open beta and keep your API key on the server.

Start with your next signup.

Free during open beta: 1,000 checks/hr. No credit card.

Create free account