
reCAPTCHA
hCaptcha
Private Captcha
Cloudflare Turnstile
mosparo
GeeTest CAPTCHA
ALTCHA
Lightweight, modern open-source CAPTCHA alternative designed using SHA-256 proof-of-work.

Developer documentation that anyone can edit

Website, pricing, platforms and company facts side by side.
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| Website | capjs.js.org | opendevdocs.com |
| Pricing | — | |
| Listed in |
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.


Share your experience with using Cap Captcha and Open Devdocs. For example, how are they different and which one is better?
When comparing Cap Captcha and Open Devdocs, you can also consider the following products.

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Independent, privacy-first, self-hostable CAPTCHA service made in EU
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Cloudflare's service for any company to replace CAPTCHAs and deliver a better experience to web visitors.
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GeeTest protects your websites, mobile Apps and APIs from bot threats.
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