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mosparo is the modern spam protection system for forms. mosparo will catch the spam messages before they get sent to the inbox. Start using mosparo today.
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mosparo is a modern spam protection system designed to safeguard online forms from spam bots without the frustrations of traditional CAPTCHAs. It works by analyzing the content of form submissions using customizable rules—such as suspicious words, domains, IP addresses, or user agents—to block spam before it reaches your inbox. Unlike CAPTCHAs, which often exclude users with disabilities, mosparo is fully accessible, privacy-focused, and self-hosted.
This project solves the problem of spam overwhelming contact forms, newsletters, and other web inputs while avoiding the accessibility barriers and privacy invasions of puzzle-based or tracking-heavy alternatives. It's built for website owners, developers, and anyone managing online forms who prioritizes user experience, data protection, and ease of integration.
mosparo was created in May 2021 to address the lack of a truly accessible and private spam filter. Developed as open-source software by a dedicated team, it's maintained in spare time with a focus on simplicity and effectiveness.
This project is useful for:
Last updated: 2026-03-24
Yes — Open Source and free to use for everyone. (Install on any regular web hosting; no costs involved.)
Yes — https://github.com/mosparo/mosparo (MIT License)
Yes — Open issues on GitHub, submit PRs, translate via Weblate, or provide feedback on the contribution page: https://mosparo.io/contribution/.
Built with ❤️ and kept warm on WarmIndex.
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