FCaptcha is an open-source CAPTCHA solution that uses vision AI and behavioral signals to detect bots, AI agents, and headless browsers. It offers self-hosted deployment, JavaScript and Node SDK integration, and supports invisible honeypots and proof-of-work mechanisms. Designed for developers seeking privacy-first, advanced bot protection.
Open Source CAPTCHA is a Security & compliance platforms product. It focuses on preventing automated bots and AI agents from abusing web forms using advanced CAPTCHA and behavioral analysis. It is built as an open-source project for web developers. Open Source CAPTCHA is open source under the MIT license. Open Source CAPTCHA is available on the web and API, and it can be self-hosted.
It is developed by WebDecoy, and the product first shipped in 2025. Development happens publicly on GitHub with 163 stars and 26 commits in the last 90 days. PulseGate's similarity index finds few close equivalents — Open Source CAPTCHA occupies a relatively distinct niche. Key capabilities include Vision AI detection, behavioral analysis, and bot detection. It exposes integrations via a public API.
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