Private Captcha offers a user-friendly CAPTCHA solution that protects forms and APIs while maintaining high privacy standards without requiring extra integration efforts. Instead of asking users to solve complex puzzles or track their behavior, Private Captcha solves an invisible cryptographic task in the background. The system automatically adjusts the task difficulty, ensuring smooth access for real users while making it too costly for bots to attempt. Cryptographic task provides equal security regardless of bot's intelligence level, making it effective even as AI technology improves.

TryDiff is a free online text and file comparison tool built for speed and simplicity. Paste or upload two files to instantly see differences side-by-side, with added, removed, and modified lines highlighted. No signup required — just open the site and start comparing.

Built for developers, writers, students, and analysts who need a fast, clean alternative to Diffchecker, Beyond Compare, and Meld. Works entirely in-browser, supports text and common file formats, and lets you download diff results.

Live at trydiff.com. Part of AIthinker LLC's lineup of no-signup developer utilities.