◷
Redline
Drop a song. Get timing. Check it by ear.
♫
Drop an audio file or .osz
or click to browse — mp3 · ogg · wav · m4a · osz
model
·
timing style
Auto
Rubato (live / classical)
Constant-tempo
·
redlines
precise (±9 ms)
simpler (±12 ms)
fewest (±18 ms)
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try a demo:
Interloper
VANITAS
song
Decoding audio…
the model is listening on CPU — about a minute for a full song
cancel
✓ Timed
confidence
←
◷
—
↶
↷
⬇ Export
Blank map (.osz) — audio + timing
.osu file — timing only
Copy timing points
Retime the uploaded map
A
⇥Tab
B
🔁 reviewing this spot ·
stop
▶
🔊
Metronome
click
AI overlay
▾
What the AI hears, painted onto the waveform
Beat glow
cyan light where the AI hears a beat — compare the grid against it
Downbeats
gold light on measure starts (beat 1 of each bar)
Beat ticks
a tick at the exact ms the AI hears each beat — the glow, sharpened. Compare with grid lines at the bottom edge
speed
1.0
0.75
0.5
0.25
zoom
—
0:00.000
Space
play ·
←
→
issues ·
Tab
A/B ·
Enter
apply ·
X
dismiss ·
Esc
stop review loop ·
Z
undo ·
E
export ·
A
advanced ·
M
metronome