Audience

Web developers and security engineers requiring a solution for user identification without compromising privacy

About ThumbmarkJS

ThumbmarkJS is a fair, privacy-friendly fingerprinting library built by developers for developers. Offered under an MIT license, it can be installed via NPM or loaded from jsDelivr, and with just a few lines of JavaScript, importing the UMD bundle and calling tm.get(), it returns a consistent 32-character thumbmark fingerprint. For small projects requiring higher accuracy, a free API version is available, while the Pro version scales indefinitely and cost-efficiently for large-scale applications. Without complex setup or invasive tracking, ThumbmarkJS has been integrated into over 60,000 websites, handling more than 1 billion identifications and 200 thousand downloads per month. It is free, open source, and has been designed as an alternative to FingerprintJS. It generates distinct, persistent device fingerprints using web APIs like canvas, audio, fonts, WebGL, and more, enabling identification of browsers across sessions.

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Pricing

Starting Price:
15€ per month
Pricing Details:
Free plan includes 1K API calls per month. Pro plan includes 15K API calls per month for 15€ / month, then 1€ per additional 1K API calls. Enterprise plan with custom pricing is available at +1M API calls per month.
Free Version:
Free Version available.

Integrations

API:
Yes, ThumbmarkJS offers API access
See Integrations

Ratings/Reviews - 1 User Review

Overall 5.0 / 5
ease 5.0 / 5
features 4.0 / 5
design 5.0 / 5
support 5.0 / 5
More Reviews Write a Review

Company Information

ThumbmarkJS
Finland
www.thumbmarkjs.com

Videos and Screen Captures

Visitor ID with select attributes

Visitor ID with select attributes

Visitor ID with select attributes Simple, transparent pricing. Start free, scale as you grow. Import the JSDelivr hosted UMD package with Javascript, or install via NPM. Get your API key by creating a free account on our website. ThumbmarkJS calculates a unique identifier based on carefully selected browser, device and HTTP request characteristics.
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Product Details

Platforms Supported
Cloud
Training
Documentation
Support
Online

ThumbmarkJS Frequently Asked Questions

Q: What kinds of users and organization types does ThumbmarkJS work with?
Q: What languages does ThumbmarkJS support in their product?
Q: What kind of support options does ThumbmarkJS offer?
Q: What other applications or services does ThumbmarkJS integrate with?
Q: Does ThumbmarkJS have an API?
Q: What type of training does ThumbmarkJS provide?
Q: How much does ThumbmarkJS cost?

ThumbmarkJS Product Features

ThumbmarkJS Verified User Reviews

Write a Review
  • A ThumbmarkJS User
    Director
    Used the software for: 6-12 Months
    Frequency of Use: Daily
    User Role: Deployment
    Company Size: 1 - 25
    Design
    Ease
    Features
    Pricing
    Support
    Probability You Would Recommend?
    1 2 3 4 5 6 7 8 9 10

    "Just what we needed"

    Posted 2026-08-17

    Pros: I really like the ease of integration with this. It's really straight forward and does exactly what it promises. The dashboard is informative and you can see exactly how many requests have been made. I also like the webhook functionality.

    Cons: It seems like the system is lacking a bit in detecting VPN connections and private browsing. Some VPN connections are not being detected, and private browsing is not something that we were able to get through this either, but we combined another service with this to get the full package.

    Overall: We were able to cut down heavily on account fraud by implementing this on our website. Previously, people were registering multiple accounts fraudulently, and we were able to now put a system in place to track when a request comes from the same machine. Really recommend using this software!

    Read More...
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