KIKI Beatmap Viewer is a free web app for osu! players, modders and mappers. You can:

Search osu! maps with detailed filters, or open your own .osz file.

Watch any map with its skin, storyboard and hitsounds.

Edit it in an editor laid out like osu!’s, with the same hotkeys.

Use Hitsound Studio to see and stamp every hitsound by sound or as piano keys, with range loops and a jog pad.

Check the map against the Ranking Criteria.

Write mod notes with timestamps that are ready to post.

Compare two versions to see what changed.

Open replays and watch them with a live Top 50.

Log in with osu! to save online and map live with friends.

It runs in your browser on Windows, Mac and phone