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.

Cotime is a free browser party game platform. No download, no account. Someone shares a link and everyone joins.

A few of the games

• The Descent. Push-your-luck. You're all on the same ship descending into the dark. Keep going and the reward grows. Push too far and the hull cracks for everyone.
• Drawma. One person draws, everyone else guesses. Bad drawing skills are more entertaining than good ones.
• Constellation. Word association. One player picks stars to match a word, everyone else tries to find the same ones.
• Critters. Draft insects, build a grid, score points. Every critter plays differently, and some steal from their neighbours.

Voice chat is built in. No separate call needed.

Slack bot included. Type /play in any channel to start a session. Teams can keep a persistent lobby linked to their workspace.

Free. Community-funded. No paywall.