DeltaBeat

A rhythm-timing trainer. Instead of playing songs, it generates a steady stream of notes from a BPM and beat division so you can drill your timing and see exactly where you drift.

• Millisecond judgment Configurable judgment tiers (PERFECT / GREAT / GOOD / MISS by default) with the exact ±ms offset shown for every note.
• Live stats Rolling average, standard deviation, best hit, and current & max combo, alongside all-time totals.
• Heatmap & weakness analysis A per-lane heatmap plus weakness analysis that flags your weakest lane and early/late bias — from pure statistics, no AI.
• Tune the drill BPM scaling, 1–8 keys, random & super-random, stream notes, approach time, metronome and hit sounds. English, Korean, Japanese, Chinese.