A teacher,
not a game.
JamJamz loops one section of a song from your Clone Hero library, slows it down without changing the pitch, and shows which hits landed early or late, in real milliseconds.
USB-MIDI kit · desktop Chrome or Edge · your songs stay on your computer
Every hit lands somewhere on this line.
JamJamz matches each hit from your kit to the nearest note in the chart, within 150 milliseconds. Left of center is early, right is late, and a note you never hit is marked missed. Offsets are real milliseconds, so they mean the same thing at 60% or at full speed.
- Window
- 150 ms
- window either side of each note
- Limbs
- 4 limbs
- right hand, left hand, toms, right foot
- Verdicts
- 5 verdicts
- hit, early, late, missed, extra
Build the chorus up to full speed.
Pick a section from the chart's markers, or drag across the bars you want. JamJamz loops it with a count-in, starting at 60%. After 3 clean passes in a row it adds 5%, until you are playing with the record. Start, step, target and passes are all adjustable.
What you need
- Kit
An electronic kit on USB-MIDI
The Alesis Nitro Mesh is mapped out of the box. For any other kit, learn mode asks you to hit a pad and say what it is. A short tap-along measures your setup's delay so you are judged fairly. Acoustic kits are not supported.
- Songs
Songs in the Clone Hero format
A folder with song.ini and a notes.mid, notes.chart or .sng drum chart. You do not need to run the game, and JamJamz never sells or ships songs.
- Browser
Desktop Chrome or Edge
They are the browsers that can read both your kit and your song folder. Brave works with its file system flag on. Safari, Firefox and phones cannot.
Read in place
Your songs never leave your computer. JamJamz reads them where they sit and never copies, changes or uploads them.
Pull the groove apart, then put it back.
Switch a loop to hands only or feet only. JamJamz judges just that part, so you can lock in the kick pattern on its own before playing everything at once.
See which parts are solid.
Progress is saved per song, difficulty and section: your best clean tempo, notes on time, and timing per limb.
| Section | Best clean tempo | % |
|---|---|---|
| Intro | 100 | |
| Verse 1 | 100 | |
| Chorus 1 | 90 | |
| Fill into chorus 2 | 65 | |
| Chorus 2 | 75 |
Example data for one song.
Before you ask
Is JamJamz a rhythm game?
No. JamJamz is a teacher, not a game. There are no scores, combos, star power or leaderboards. It measures how close each hit lands to the real drum part, tells you which limb is early or late, and helps you build one section up to full speed.
Do I need Clone Hero?
You need songs in the Clone Hero folder format: a song.ini file plus a notes.mid, notes.chart or .sng drum chart and the audio. You do not need to run the game. JamJamz does not include or sell songs, and it is not affiliated with Clone Hero.
Do I need an electronic drum kit?
Yes. JamJamz reads your playing from an electronic kit connected over USB-MIDI, so it can time every hit precisely. Acoustic kits are not supported. The kit makes the drum sounds; JamJamz plays only the song audio, with the drum track muted or kept in.
Pricing
Free $0 forever
Pro $9 per month or $90 per year
Draft prices, set before launch
Bring your kit.
Bring your songs.
JamJamz is in private testing. Join the waitlist for early access. We invite people in small groups, and telling us which kit you play helps us decide who goes first.