ThumbmarkJS

Open source browser fingerprinting library with 99% accuracy. Get visitor IDs, detect bots, prevent fraud. Free version available, Pro starts at 15€/month.

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ThumbmarkJS Reviews and Details

This page is designed to help you find out whether ThumbmarkJS is good and if it is the right choice for you.

#Developer Tools #Developer APIs #Security & Privacy #Anti-Spam #Fraud Detection And Prevention #Fingerprinting #Open Source

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Landing page //
2026-01-03

Features & Specs

Ease of Use

ThumbmarkJS is praised for its intuitive API, making it easy for developers to integrate and utilize without extensive learning curves.
Lightweight

ThumbmarkJS is a lightweight library, ensuring that it does not significantly increase the load times of web applications, contributing to a smoother user experience.
Customization

The library offers a range of customizable options, allowing developers to tailor the functionality and appearance to better fit their project needs.
Cross-Browser Compatibility

ThumbmarkJS is designed to work seamlessly across various browsers, reducing the need for additional browser-specific code handling.

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Questions & Answers

As answered by people managing ThumbmarkJS.

Why should a person choose ThumbmarkJS over its competitors?

While extremely performant, ThumbmarkJS shines in its affordability and developer friendliness.

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Is ThumbmarkJS good?

ThumbmarkJS is a solid open-source, client-side browser fingerprinting library that's good for lightweight visitor identification without server-side infrastructure, though it should be evaluated against your specific privacy compliance and accuracy requirements before production use.

Why choose ThumbmarkJS?

Open-source and free to use, allowing full transparency into how fingerprinting works
Lightweight and easy to integrate with a simple JavaScript snippet
Runs entirely client-side, reducing backend infrastructure needs
Combines multiple browser signals to generate a fairly stable and unique identifier
Active development and community support on GitHub
No third-party API dependency for basic fingerprinting, giving more control over data handling

Recommended for

Developers needing basic visitor or device identification without cookies
Fraud detection or bot mitigation use cases requiring lightweight fingerprinting
Analytics platforms wanting to track unique visitors without traditional tracking cookies
Small to medium projects that don't require enterprise-grade fingerprinting accuracy
Teams wanting an open-source, self-hosted alternative to commercial fingerprinting services

External links

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Public traffic stats of ThumbmarkJS

Check the traffic stats of ThumbmarkJS on SimilarWeb. The key metrics to look for are: monthly visits, average visit duration, pages per visit, and traffic by country. Moreoever, check the traffic sources. For example "Direct" traffic is a good sign.
Domain Rating (DR)

Check the "Domain Rating" of ThumbmarkJS on Ahrefs. The domain rating is a measure of the strength of a website's backlink profile on a scale from 0 to 100. It shows the strength of ThumbmarkJS's backlink profile compared to the other websites. In most cases a domain rating of 60+ is considered good and 70+ is considered very good.
Domain Authority (DA)

Check the "Domain Authority" of ThumbmarkJS on MOZ. A website's domain authority (DA) is a search engine ranking score that predicts how well a website will rank on search engine result pages (SERPs). It is based on a 100-point logarithmic scale, with higher scores corresponding to a greater likelihood of ranking. This is another useful metric to check if a website is good.
Public opinion on Reddit

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ThumbmarkJS discussion

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Is ThumbmarkJS good? This is an informative page that will help you find out. Moreover, you can review and discuss ThumbmarkJS here. The primary details have not been verified within the last quarter, and they might be outdated. If you think we are missing something, please use the means on this page to comment or suggest changes. All reviews and comments are highly encouranged and appreciated as they help everyone in the community to make an informed choice. Please always be kind and objective when evaluating a product and sharing your opinion.