Lightweight, modern open-source CAPTCHA alternative designed using SHA-256 proof-of-work.
Portugal
EU
Anubis weighs the soul of your connection using a sha256 proof-of-work challenge in order to protect upstream resources from AI scraper bots.
Cost / License
- Free Personal
- Open Source (MIT)
Application type
Platforms
- Self-Hosted
- Go (Programming Language)
- Docker
Best alternatives are49 alternatives
Cloudflareand
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
Best alternatives are31 alternatives
5.0Excellent6 reviews
Cost / License
- Free
- Open Source (AGPL-3.0)
Application type
Platforms
- Online
- Self-Hosted
- Software as a Service (SaaS)
Best alternatives are32 alternatives
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
+2
Best alternatives are16 alternatives
Primecoin is an innovative cryptocurrency, a form of digital currency secured by cryptography and issued through a decentralized mining market. Derived from Satoshi Nakamoto’s Bitcoin, Primecoin introduces an unique form of proof-of-work based on prime numbers.
Canada
United Kingdom
India
Germany
