Apps with 'Captcha' feature

Lightweight, modern open-source CAPTCHA alternative designed using SHA-256 proof-of-work.

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.

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.

hCaptcha is designed to solve the most labor intensive problem in machine learning: labeling massive amounts of data in a timely, affordable, and reliable way.

ALTCHA 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.

A no-nonsense CAPTCHA system with seamless UX | Backend component.

Online form builder with cloud storage database.

Friendly Captcha is a tool for preventing spam on your website.

SafeLine is a docker-based, easy to use, self-hosted free web application firewall (WAF) that protects web apps by filtering and monitoring HTTP traffic between a web application and the Internet.

Automatically solve hCaptcha using AI. Locally, with Chrome extension.

It's a free-to-use automated CAPTCHA solver, compatible with multiple CAPTCHA types, and powered by advanced deep learning models.

This extension provides unlinkable cryptographic tokens for websites that support the Privacy Pass protocol. For example, these tokens can be used on Cloudflare-protected websites to redeem a token instead of solving a CAPTCHA.

TrustCaptcha is a privacy-first, invisible CAPTCHA that protects your website from bots and spam—without disrupting your users.

CapMonster Cloud is an automated CAPTCHA-solving service that bypasses CAPTCHA challenges during web scraping, data extraction, and various automated online tasks. CapMonster Cloud can automatically solve reCAPTCHA, hCaptcha, Cloudflare captcha, Tencent and other types of captchas.

User Meta gives you full power of a advanced role based user management and form building experience. There are email notification, shortcode, widget and template tag function to ease your community building using only drag and drop and no coding.

IronWall is a Proof-of-Work (PoW) rate-limiting protocol designed to protect high-value API endpoints (AI generation, Auth, SMS triggers) from automated abuse.

MTCaptcha is a smart captcha service that prioritizes privacy and accessibility. It offers an adaptive invisible noCaptcha that is easy for humans but hard for bots, making verification frictionless. MTCaptcha is GDPR and WCAG compliant, ensuring that your data is never sold or...

InputGuard is the privacy friendly alternative to reCAPTCHA or other captcha tools.

Captoshi is a Web3 startup redefining online earning through interactive math challenges.

This browser extension supports recognition of the most popular CAPTCHAs, including reCAPTCHA v2, v3, reCAPTCHA v2 invisible, enterprise, hCaptcha, FunCaptcha, AWS Waf Captcha and regular picture captcha with numbers and letters(ImageToText).

The Arkose Labs platform undermines the economic drivers behind fraud until perpetrators are compelled to abandon attacks. Real-time risk classification of traffic with interactive enforcement challenges, the solution defeats automated attacks...

AuthKong is a smart captcha service designed to protect websites from spam and abuse while ensuring real users can pass through effortlessly. It offers a more user-friendly and effective alternative to traditional captcha systems like reCAPTCHA, featuring easy-to-use slider and...

A zero database architecture, powered by a proprietary hybrid in-memory indexing engine algorithm, that enables CAPTCHA authentication to be performed using minimal data bits against server memory.

Protect your business from bots and spam while ensuring 100% data privacy compliance. No puzzles, no tracking – just invisible security that works.

conCaptcha is a self-hosted captcha which is faster, more user-friendly and more customizable than other captchas - available for PHP and ASP.NET websites. Users no longer have to read any annoying text images, solve difficult math equations or play any puzzle games.