mosparo

Mosparo protects online forms by analyzing submitted data against user‑defined rules, similar to an email spam filter. Instead of presenting puzzles or images, it scans each field, the visitor’s IP address and user‑agent, and blocks entries that match prohibited patterns. The system is built for self‑hosting on typical web servers, requires PHP 8.1+ and a MySQL, PostgreSQL or SQLite database, and occupies less than 100 MB of disk space.

The tool is intended for site owners and developers who need a privacy‑focused, accessible alternative to traditional CAPTCHAs. Because it does not rely on visual challenges, it works with screen readers and other assistive technologies, making it usable by people with disabilities. All collected form data are encrypted by default and automatically deleted after 14 days, and the software is released under the MIT license as free, open‑source code.

Key aspects include a customizable protection box that can be styled to match any site, optional caching back‑ends such as Redis or Memcached, and a rule engine that can be tailored to catch a wide range of spam patterns. The project is stable, self‑hostable, and does not require a subscription or external service.