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

Managed Hosting for developers, entrepreneurs, and businesses like yours

Website, pricing, platforms and company facts side by side.
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| Website | thumbmarkjs.com | opalstack.com |
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What each product offers, as listed by its team.


Possible disadvantages
An editorial look at what each product does well and who it suits.


Overall verdict
Why this product is good
Recommended for
Overall verdict
Why this product is good
Recommended for
How often each product is chosen within a category, 0–100% relative to the other.


As answered by people managing ThumbmarkJS and Opalstack.
ThumbmarkJS's answer
While extremely performant, ThumbmarkJS shines in its affordability and developer friendliness.
Share your experience with using ThumbmarkJS and Opalstack. For example, how are they different and which one is better?
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The easiest way to protect your users from getting hacked
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Fraud detection and prevention using browser fingerprinting with 99.5% accuracy. Stops account sharing, payment processing fraud and gaming.
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