captchaapi.eu review
A focused CAPTCHA API for sites that prefer browser proof-of-work to puzzles.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
captchaapi.eu is a hosted CAPTCHA API for protecting website forms from automated abuse, aimed at teams that want browser-based proof-of-work rather than puzzle challenges. A JavaScript widget runs challenge computation in a Web Worker, then sends a token to a backend verification API. The service is a fit for small sites seeking a simple protection layer, particularly those that want an EU-hosted service and no cookies or persistent fingerprinting. It is less suited to buyers who need multiple challenge types or documented audio and accessibility alternatives.
The integration story centers on web forms and backend token verification, with documented options for plain HTML and Laravel, Next.js, Django, Rails, and WordPress. That gives developers several common paths to add the widget, while keeping the core approach consistent: browser proof-of-work, adaptive per-IP difficulty, sitekey-wide attack hardening, and single-use tokens to block replay. The service also lists API access and cloud and browser-extension deployment. Its narrower focus is important: the documented CAPTCHA mode is proof-of-work, so organizations looking for a choice of challenge styles should compare alternatives.
Pricing is freemium, with the Free plan at €0 per month and a 5,000-challenge monthly cap; it includes EU-hosted infrastructure and commercial use. Starter costs €9 per month and adds email support and dashboard charts alongside commercial use. Growth is €29 per month, with priority email support and dashboard charts; Business is €79 per month and lists priority support and dashboard charts. The paid tiers make sense when their support and dashboard options match operational needs, but they retain the same proof-of-work focus. Small sites that want a privacy-conscious, framework-integrated CAPTCHA can start with Free; sites needing documented alternative challenges should look elsewhere.
captchaapi.eu pros and cons
- Where it wins
- Invisible Web Worker challenges avoid a visible puzzle flow.
- Adaptive per-IP difficulty and replay protection harden verification.
- Free plan includes EU-hosted infrastructure and commercial use.
- Where it doesn't
- Proof-of-work is the sole documented CAPTCHA mode.
- Audio challenges and accessibility alternatives are not documented.
- The Free plan is capped at 5,000 challenges per month.
captchaapi.eu fact sheet, pricing and score →
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