Logo OCTACHRON iOS MIDI Drum Sequencer (AUv3) Logo OCTACHRON iOS MIDI Drum Sequencer (AUv3)

Very flexible up to 16 Track iOS MIDI Drum Sequencer
With Smart Randomizer + Trigger and CC Mutation
★★★★★ Five star rating on the App Store
Works standalone or as AUv3 MIDI plugin
iOS 12 upwards
Optimized for iPad and iPhone
Also runs on M Macs and Apple Vision Pro




“OCTACHRON is almost perfect now” - haQ attaQ

More Voices

“An exciting MIDI sequencer with advanced features”
- Synth Anatomy
“Particularly the probability parameters are a lot of fun”
- Amazona
“OCTACHRON controls just everything with iPad”
- Gearnews

“Favorite MIDI Sequencer - User's Choice Award 2022”
- iOS AUv3 Facebook Group


Please notice: OCTACHRON is a MIDI sequencer and does not create any sounds of its own.


  • Standalone or AUv3 MIDI plugin
  • Works inside AUM, Cubasis, Logic Pro, Beatmaker, ApeMatrix, Nanostudio and other hosts compatible with MIDI AudioUnit (Not GarageBand)
  • Optimized for drums but also fun for basic melody lines
  • OCTACHRON is specialized in in depth MIDI sequencing and does not create any sounds of its own.
  • 1-32 steps with flexible clock divider and custom time signatures
  • Up to 16 mutable tracks with flexible length
  • Up to 8 chainable patterns (song mode)
  • Swing with flexible swing grid
  • Save and restore your presets
  • Parameter lock for velocity, trigger probability, trigger condition, ratcheting and MIDI CC Modulation
  • Scales generator
  • MIDI control pattern selection and mute
  • Customizable mapping and mapping presets
  • Works iOS 12 upwards
  • Also runs on M Macs and Apple Vision Pro

mapping presets for drum apps and hardware

  • AR-909, Axxon 2 & Blip Box
  • Dadamachines Automat, Digistix & DM1/DM2/Drumlab
  • DrumComputer by Sugar Bytes
  • EGDR 606, 808 & 909
  • FAC Drumkit & Hammerhead
  • Koala Sampler & Korg Gadgets
  • MV08 & NS2 Slate
  • Pure Acid Drums
  • Ruismaker & Ruismaker FM
  • SDS-X, Sitala & Splat-To-Clat
  • VA DrumSM, VA Drum2 808 & 909
  • Vatanator
  • Korg Electribe EMX & ER-1
  • Korg Volca Beats
  • MFB 522
  • Roland MC-101
  • Roland TR-08 & TR-8S
  • Roland TR-707 & 727
  • Roland TR-808
  • Roland TR-909
  • Also save, load and share your own MIDI mappings ...

Smart Randomizer

  • Smart pattern randomizer
  • Randomizer configuration per track
  • Trigger mutation per track
  • Mutation of internal and CC modulation parameters

Track Settings

  • Assign MIDI notes to each track or use mapping presets
  • Individual track length to create polyrhythms
  • Mute tracks to easily create build ups in live situations


  • OCTACHRON lets you sequence other standalone apps, AUv3 AudioUnits or external hardware via MIDI
  • OCTACHRON derives its timing from its host application, its internal clock or via AbletonLink

And more ...

  • OCTACHRON works offline
  • No push notifications
  • No ads or in-app purchases
  • No third-party behavioural tracking tools
  • Active in the mobile music community
  • Ongoing development and support and many new features on the list



  • 1-32 steps
  • 1-16 tracks
  • 8 patterns
  • Smart Randomizer
  • Mutation
  • Pattern chaining
  • Swing
  • Flexible swing grids


  • Song mode
  • Pattern chaining
  • Pattern repeat
  • Copy / Paste

Parameter Lock

  • Velocity
  • Ratcheting
  • Trigger probability
  • Trigger condition
  • 8 CCs per Track
  • Mutation of Internal and CC Modulation


  • Individual length
  • Mute


  • Edit MIDI note per track
  • Edit CC addresses
  • Presets for popular drum apps and hardware


  • Standalone
  • Audio Unit v3 Extension
  • Ableton LINK
  • MIDI out


Download OCTACHRON on the App Store:



Do you have questions or feedback on OCTACHRON?

Best thing is to tag us in a comment under a post from us, so that others benefit from it as well.
Also follow us there for nice jams and latest updates ...

Or check out this wonderful thread in the Audiobus Forum:

Or if both does not work out well for you, write us an email:
mail at octachron.de


Markus Teufel
Schulstr. 4
80634 Munich

mail at octachron.de


If you like to review OCTACHRON, please download our press kit.