Metronomes
don't do
breakdowns.
Learn heavy riffs the way they're played: locked to a band. Plug in, mute your part, take the riff, and a timing coach tells you exactly how tight you are, note by note.
Practice with a band,
not a click.
Every part, played
Drums, synth walls, a 7-string guitar and a 5-string bass, all written from the same tab you're reading.
Mute your part
Hear the riff first, then switch it off and play it yourself. The band keeps going. Turn off the drums, synths or bass the same way.
Three real tempos
70, 85 and 100%, each one re-rendered at that tempo. No warbly time-stretch: the same tone and tuning at every speed.
Plug straight in
A built-in amp with four voices, from tight djent to doom, and a bass amp. Or play through your own rig and the app just listens.
A path,
not a pile.
50 riffs in six stages, from chug control to blast-beat tremolo. Each riff has three steps, and the timing coach signs each one off.
Chug control
Tight palm mutes that land exactly with the kick drum.
8 riffs · 3-3-2 chugs, zero-fret syncopation, two-step, 3/4 doomPicking hand
Gallops, down-picking and 16th-note endurance without tensing up.
8 riffs · gallops, 12/8 triplets, thrash at 180 and 200 BPMGroove & syncopation
Off-beat chugs and rests that feel heavy, not late.
9 riffs · off-beat kicks, breakdowns, slam, sludge, stonerOdd time & polyrhythm
Counting 5, 7, 9 and 15 without losing the downbeat.
9 riffs · 5/4, 7/8, 9/8, 15/16, polymeter, mathcoreSpeed & extremes
Tremolo picking over blast beats, clean at full tempo.
9 riffs · blasts, black metal, tech death, deathcoreTexture & dynamics
Ringing chords, octaves, leads and building a wall of sound.
7 riffs · post-hardcore, melodic metalcore, post-metalRushing?
Dragging?
Plug into your interface and the coach listens to every pick. Each note on the tab turns green, yellow or red, and you see your average offset in milliseconds. "Pretty tight" becomes a number you can beat.
Bassists
too.
Flip to bass and everything follows: 5-string tab in GCGCF, a bass tuner, the coach and your own progress through the path. Mute the bass, lock in with the kick, hold down the low end.
50 riffs. Every corner of heavy.
Odd time in 5/4, 7/8, 9/8 and 15/16. Gallops, two-steps, slams, tremolo chords and breakdowns with rests you have to count. Every riff tells you what it trains and the one thing to watch.
Turn it up.
Start free.
Go Pro when it clicks.
Free
- 4 riffs at every speed, including Lowlight
- Built-in amp, mixer and timing coach
- Guitar and bass
Pro yearly
- All 50 riffs, every speed, full band
- The whole six-stage path
- Every new riff as it ships
- About $5.75 a month
Pro monthly
- Everything in Pro
- Cancel any time from Billing
The rig, outside
the browser.
The amp, to download
The four built-in voices and the bass amp as an app for Mac and Windows, and as a VST3®, AU and CLAP plugin for your DAW.
VST is a registered trademark of Steinberg Media Technologies GmbH.Pedals
A boost, a doubler, a room, a tempo-synced stutter and the Angle Grinder, each as its own app and plugin. Sold one at a time, or the boost, doubler and room as a bundle.
Angle Grinder
A Swedish chainsaw-style drive with Grind, Low and High all on 10 by default, for the full buzzsaw. Its gate follows your picking hand, so stop-start riffs stop dead. Put it in front of a clean amp.
Expansion packs
New styles and tunings: 6- and 8-string versions, drop tunings, more odd-time and more bass-led riffs.
Control it from your AI
Connect Claude, ChatGPT or another AI assistant to your amp and pedals. Ask for a tighter low end or a cleaner chorus part and hear it change while you play.
Straight answers.
What do I need?
A guitar or bass in the tuning below, an audio interface, and Chrome on a Mac or PC. The built-in amp gives you a heavy tone with nothing else installed, or you can play through your own amp or amp sim.
What tuning is it in?
Every riff is written for a 7-string in GCGCFAD and a 5-string bass in GCGCF. Other tunings and string counts are planned as expansion packs.
Will I hear a delay?
The amp itself adds about a quarter of a millisecond. What you hear depends on your interface's buffer size and your computer. On a Mac with a small buffer it feels immediate; on Windows, browsers add more, so playing through your own rig with direct monitoring is the tightest option.
Can I cancel?
Yes, any time, from Billing in the app. You keep Pro until the end of the period you paid for. Cancel during the 7-day trial and you're never charged.