Lightweight, modern open-source CAPTCHA alternative designed using SHA-256 proof-of-work and JS instrumentation
Portugal
EU
Cloudflare Turnstile AlternativesOnly apps categorised as Anti-Spam Tools
The best Anti-Spam alternative to Cloudflare Turnstile is Cap Captcha, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 10 alternatives to Cloudflare Turnstile and 14 are Anti-Spam Tools so hopefully you can find a suitable replacement. Other interesting Anti-Spam Tool alternatives to Cloudflare Turnstile are reCAPTCHA, Procaptcha, Private Captcha and ALTCHA.
Alternatives list
31 reCAPTCHA alternativesreCAPTCHA is a free service that protects your site from spam and abuse, using risk analysis techniques to tell humans and bots apart.
Prosopo Procaptcha redefines user verification with a unique approach that emphasizes privacy and security. It's a pioneering solution designed to offer an alternative to conventional CAPTCHA systems that often compromise user privacy.
Cost / License
- Freemium
- Open Source (Apache-2.0)
Application type
Platforms
- Online
- Software as a Service (SaaS)
- Wordpress
+3
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.
+1
21 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.
33 hCaptcha alternativeshCaptcha is designed to solve the most labor intensive problem in machine learning: labeling massive amounts of data in a timely, affordable, and reliable way.
mosparo is the modern solution for protecting your online forms from spam. The protection method is quite simple: mosparo blocks spam using rules matching the form’s data. The detection method is comparable to an e-mail spam filter.
+9
Friendly Captcha is a leading cybersecurity company with a clear mission: to reliably defend against modern bot attacks and spam while complying with the GDPR and other privacy regulations. As Germany's largest CAPTCHA provider, Friendly Captcha uses innovative technology to...
Cost / License
- Freemium
- Proprietary
Application type
Platforms
- Online
- Software as a Service (SaaS)
TrustCaptcha is a privacy-first, invisible CAPTCHA that protects your website from bots and spam—without disrupting your users.
Cost / License
- Freemium
- Proprietary
Application type
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
+4
Anti-Spam Features. CleanTalk protects your website from spam bots and spam in Comments, Orders, Widgets, Registrations, Bookings, And any custom web form, Contact Emails, Subscriptions, Checks the existing comments and users for spam.
+7
United States
United Kingdom
Estonia
Czechia
India
Switzerland
Germany
Turnstile was being easily bypassed by the various solvers available on GitHub. Procaptcha stopped these bots from getting through.