
Which is more popular?
Based on our record, Castle should be more popular than SSLMate. It has been mentioned 4 times since March 2021.
Website, pricing, platforms and company facts side by side.
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| Website | castle.io | sslmate.com |
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What each product offers, as listed by its team.


Possible disadvantages
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
Walkthroughs and reviews on video.
How often each product is chosen within a category, 0–100% relative to the other.


Share your experience with using Castle and SSLMate. For example, how are they different and which one is better?
Recommendations tracked on public social media and blogs since March 2021.


This (agent detection) is now a kind of emerging space. Obviously it'll get much more important, too. Other products in the space: - Foil (https://usefoil.com/), I'm biased, a friend is building this - Kasada https://www.kasada.io/ -... - Source: Hacker News / 2 months ago
Castle (https://castle.io) | Senior ML Engineer | Senior R&D Detection Engineer | REMOTE (Europe/EMEA) | Full-time Hi HN! I’m Antoine, Head of Research at Castle. We’re a YC-backed Series A startup helping companies like Canva,... - Source: Hacker News / over 1 year ago
Tell me about the fingerprint, they using castle.io within segment.com ? Or something else? And what they watching? Source: over 3 years ago
The FastCGI specification is 30 years old today. It was published on April 29, 1996. It is, on a couple of structural axes that have come to matter a great deal in 2026, the protocol that the rest of the industry should be using for... - Source: dev.to / 4 months ago
I use sslmate for our one-year certs. They have proven solid over the last few years and, big pro for me: they offer scripted purchase/renewal/whatever from commandline. Source: about 5 years ago
When comparing Castle and SSLMate, you can also consider the following products.

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