Lightweight, modern open-source CAPTCHA alternative designed using SHA-256 proof-of-work and JS instrumentation
Platforms
- Self-Hosted
- Docker
Portugal
EU
reCAPTCHA AlternativesOnly apps from the EU
The best alternative to reCAPTCHA is Cap Captcha, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 25 alternatives to reCAPTCHA and ten of them are so hopefully you can find a suitable replacement. Other interesting alternatives to reCAPTCHA are ALTCHA, Friendly Captcha, Private Captcha and TrustCaptcha.
Alternatives list
26 ALTCHA alternativesALTCHA is a privacy-first solution built to help developers and website owners stop bots, spam, and automated abuse — without making things harder for real users. It replaces traditional CAPTCHA systems with a smarter, quieter approach to verification and threat detection.
Czechia- EU
Friendly Captcha is an invisible CAPTCHA and bot protection solution that helps block bots and spam with privacy-first proof-of-work-without image or audio puzzles, cookies, or user tracking. GDPR- and CCPA-compliant and TÜV-certified as conformant with WCAG 2.
Germany- EU
Private Captcha is an independent, privacy-first, self-hostable Proof-of-Work CAPTCHA service made in EU. Instead of asking users to solve complex puzzles or track their behavior, Private Captcha solves an invisible cryptographic task in the background.
Platforms
- Online
- Self-Hosted
- Docker
Estonia- EU
+1
TrustCaptcha is a privacy-first, invisible CAPTCHA that protects your website from bots and spam—without disrupting your users.
Platforms
- Online
- Spring
- Kotlin
- Rust
- Ruby
- Python
- .NET Framework
- Craft CMS
- React
- Groovy
- JavaScript
- Angular
- Software as a Service (SaaS)
- Scala
- PHP
- Go (Programming Language)
- Typescript
- Java
- Wordpress
- Node.JS
- Vue.js
- Germany
- EU
+4
Mollom is a freemium web service to get rid of spam, unwanted content and fake users on your Drupal, Wordpress and Joomla site or blog.
Cost / License
- Freemium
- Proprietary
Since
- Since 2011
Alerts
- Discontinued
Platforms
- Online
Stop bots and fraudsters with invisible protection. Barrier-free bot protection without CAPTCHAs, GDPR-compliant and made in Germany.
Platforms
- Software as a Service (SaaS)
- Online
- Germany
- EU
Protect your business from bots and spam while ensuring 100% data privacy compliance. No puzzles, no tracking – just invisible security that works.
Cost / License
- Paid
- Proprietary
Since
- Since 2025
Platforms
- Software as a Service (SaaS)
- Online
TrustSig replaces traditional CAPTCHAs with deep device fingerprinting. Puzzles and checkboxes frustrate human visitors and damage conversion rates. We built a platform that extracts hardware telemetry to block bot traffic out-of-band.
Cost / License
- Freemium
- Proprietary
Since
- Since 2026
Platforms
- Online
- Software as a Service (SaaS)
- Wordpress
- Estonia
- EU
Poland
Belgium
Austria
