Fingerprint and FingerprintJS alternatives

Fingerprint vs FingerprintJS: which one are you replacing?

Fingerprint (fingerprint.com, legally FingerprintJS, Inc.) sells Fingerprint Identification, the product once called FingerprintJS Pro. Its JavaScript agent, or its iOS and Android SDKs, send evidence to Fingerprint, which returns a visitor ID; by Fingerprint’s own account the ID holds across incognito sessions. Your server then reads Smart Signals through the Server API or a webhook. The Smart Signals reference documents VPN detection, residential and data-center proxy detection, Tor exit nodes, bot detection, browser tampering that includes antidetect browsers, incognito mode, virtual machines, velocity, and a Suspect Score: a weighted average of the other signals, with weights you can set. Calling it “just an identifier” is out of date.

Two newer pieces matter in a comparison. A Rules Engine, in open beta, turns your rulesets into “Block with response” or “Allow with headers”. Through the Server API your own code enforces that action; a Flow worker on a Cloudflare-proxied site, also in beta, can enforce it for you. And AI agent detection verifies agents that sign their requests with Web Bot Auth and reports the provider.

FingerprintJS is the open-source library the company grew out of in 2012. It has been MIT-licensed again since v5.0.0 (October 2025); v4 was under the Business Source License, which allowed production use only with a commercial licence. It runs entirely in the browser and has no Smart Signals, and its README says its accuracy is “significantly lower than in the commercial version” and that its fingerprints are “vulnerable to spoofing and reverse engineering”. Moving from one to the other is a change of job, not a package rename.

What to look for in a replacement

• Output: a visitor ID your code interprets, or an allow, review or block decision your code routes on
• Plan: which signals your tier returns. Fingerprint’s own pages disagree about its Free plan
• Platforms: Fingerprint has native iOS and Android SDKs; Maskbreak checks browser visits only
• History: visitor IDs, device history and account links do not carry over from one vendor to another
• Missing evidence: what your app does when the browser check never arrives. Hold the action; silence is not a clean result
• Allowance shape: Fingerprint counts calls per month; Maskbreak counts visitor checks per calendar month, with an hourly cap (1,000 an hour on Free, up to 50,000 on Scale). Measure your busiest hour as well as your month

Three options for different use cases

Fingerprint vs Maskbreak, question by question

Both run an invisible check in the browser and read the result on your server, and both flag VPNs, proxies, Tor, bots and tampered browsers. The difference is what comes back and who turns it into an action. Fingerprint’s cells come from its public docs and pricing page, read on 24 September 2026.

What a Maskbreak answer looks like at signup

A script drives a headless browser through your signup form from a rented cloud server. The address alone stays allow, because offices and cloud desktops use cloud servers too; the browser check sees the automation framework, and the default policy blocks. Example response, selected fields:

{
  "decision": "block",
  "risk_score": 70,
  "reasons": ["datacenter_asn", "automation_detected"],
  "network": {
    "vpn": false,
    "proxy": false,
    "datacenter": true,
    "tor": false,
    "residential": false,
    "service": null
  },
  "device": {
    "automation": true,
    "antidetect": false,
    "emulator": false,
    "tampering_score": 0
  }
}

Now a real browser on a home broadband line, signing up for the third time. Fingerprint can count this too: its velocity signals report how many distinct linked IDs (the identifier your code attaches, such as an account ID) a visitor ID has carried over the last 5 minutes, hour and 24 hours. The difference is the window. When your backend adds its own accountId (a pseudonymous user ID, never an email), Maskbreak counts how many of your accounts have used that device in the last 90 days, inside your own account only, with your IDs linked as keyed hashes. Example response, selected fields:

{
  "decision": "allow",
  "risk_score": 0,
  "reasons": ["multi_account_device"],
  "network": {
    "vpn": false,
    "proxy": false,
    "datacenter": false,
    "tor": false,
    "residential": true,
    "service": null
  },
  "device": {
    "visitor_id": "<stable ID for this browser>",
    "linked_accounts": 3,
    "multi_account": true
  }
}

The default leaves that at allow, because families share laptops. For a free trial or a signup bonus, act on it in your own code: route an allow that lists multi_account_device the way you route a review, or set your own threshold on device.linked_accounts. A Review rule for multi-accounting on the Rules tab does the first of those for you, and it never lowers a block: a proxy, bot, fake browser or emulator on the same visit still blocks. The multi-accounting playbook covers what to do with each answer.

Fingerprint pricing in September 2026, next to Maskbreak’s

Both allowances are monthly, but bursts are capped differently, so compare them at your busiest hour too. Fingerprint counts calls per month and applies a default limit of 5 requests a second on every plan. Maskbreak counts visitor checks per calendar month, with an hourly cap: 1,000 an hour on Free, 5,000 on Starter, 20,000 on Growth and 50,000 on Scale. The Free cap is comfortable for steady traffic and tight during a launch that brings several thousand signups in one hour. Past either limit Maskbreak answers 429 with Retry-After and adds no overage charge, so decide in advance whether your form waits, queues or lets the visitor through. And check the plan before you compare features: Fingerprint’s Smart Signals reference and pricing table show VPN, proxy and tampering signals on Free, while its billing guide says Smart Signals need Pro Plus or Enterprise.

Stopping bots without losing real signups

Every hosted option on this page checks the visit invisibly, so none of them costs you a conversion by showing a puzzle. Conversions are lost in the policy instead. Block on evidence a real customer seldom produces, and send the rest to a cheaper step such as an email code. This is how Maskbreak’s defaults split them:

Two habits protect conversion more than any threshold. Start in watch mode: log every decision, let every visitor through, and compare a week of Events with what your support inbox already knows before you enforce anything. And decide what a missing result means: if the browser evidence never arrived, step up or hold, rather than treating silence as clean. Our guides to bot detection without CAPTCHAs and a staged fraud-detection rollout walk through both.

Other Fingerprint competitors: open-source libraries and hosted services

Two kinds of tool compete with Fingerprint: libraries you run yourself, and hosted services that send your server an answer. Prices below were read on the vendors’ pages in September 2026.

One rule covers the whole left column: an identifier computed on the visitor’s own machine is only as honest as that machine. Use it to recognise a returning browser, and take fraud evidence from a check your server verifies.

How to test Maskbreak next to Fingerprint before you switch

Run both on the same form for a week before you remove anything. Send Maskbreak only the values its own SDK returns: a visitor ID or event ID from another service is not a Maskbreak token or event ID, and the two are not interchangeable.

1. Create a Maskbreak account and keep its live key in your server environment. The browser script does not need that secret.
2. Load Maskbreak’s browser SDK and call window.Sentinel.collect() at the action you want to check: signup, login, checkout or a bonus claim.
3. Send the values collect() returns to your backend with the form, exactly as the quickstart shows. Your backend calls POST /v1/evaluate with Authorization: Bearer YOUR_LIVE_KEY.
4. Stay in watch mode: keep your existing Fingerprint integration running unchanged, log decision and reasons beside Fingerprint’s signals for the same visit, and let every visitor through. The integration guide starts this way.
5. Before you enforce, decide what review means in your app (an email code, a manual queue, a smaller first payout) and what happens when the device block is missing or degraded is true.
6. Reject test, sandbox or sample results in production, and keep your existing authentication in front of every protected action.

Fingerprint likewise recommends verifying identification evidence on the server and defending against replay. Whichever service you choose, a browser-supplied verdict is not authorization. Our controlled test cases let you check both before you change enforcement.