Caustic 4+

Rejean Poirier

Designed for iPad

    • £8.99



Caustic 3 is a music creation tool inspired by rack-mount synthesizer/sampler rigs.
Everything is real-time and optimized for mobile devices.

Create your rack by adding up to 14 machines from a choice of:

* Subsynth - Virtual analog subtractive synthesizer
* PCMSynth - Multi-sample wave synthesizer
* BassLine - 303-like monosynth
* BeatBox - 8-channel sampling drum machine
* PadSynth - Harmonic table pad synthesizer
* 8BitSynth - 8bit equation solver synthesizer
* Modular - Fully configurable and routable synthesizer
* Organ - Tonewheel organ with rotary speaker
* Vocoder - 8-band harmonic vocoder
* FMSynth - DX-style 3-operator fm synthesizer
* KSSynth - Karplus-Strong string modeling synthesizer
* SawSynth - Supersaw-type synthesizer

The app also includes:

* Effects rack supporting 2 effects per machine (20 effect types).
* Mixer desk with EQ, panning and global Delay/Reverb effects.
* Master section with effect slots, parametric EQ and limiter.
* Song sequencer

AudioBus support for Input and Output slots.
AudioCopy Paste + AudioShare support for import and export.

Supports automation recording on most controls and includes powerful editors for modifying automation curves.

Users can record their own WAV files for use in the PCMSynth, BeatBox, and Vocoder or import files through iTunes file sharing, ACP, AudioShare, or the built-in FTP server.
Supports all uncompressed WAV files (8-16-24-32bit, any sampling rate).
The PCMSynth can also load SoundFont files (.sf2), SFZ and FL/Xewton instruments (.instr, .ZIP)

"Open In.." import support for all preset types, .WAV, .SF2 and .MID.
(MIDI (.mid) files can be imported as raw sequencer note data.)

Supports CoreMIDI and virtual MIDI for note, velocity and CC data. (be sure to set "Enable background audio" in advanced options to use virtual MIDI)

See the in-app help section for dozens of informative tutorial videos and full online manual.

There is also a FREE (full version) PC/Mac version available for download on the product website.

Come visit to download more presets, request features, share your tracks and hear what others are creating with Caustic 3.

Works on iPhone/iPod but iPad is recommended.

What’s New

Version 3.2.0

This app has been updated by Apple to display the Apple Watch app icon.

New machine: SawSynth (Polyphonic supersaw-type synth)

New "melody helper" to lock keyboards to scales
Support for more time signatures (3/4, 4/4, 5/4, 6/4, 7/4) from the song page and in pattern editors
Tool to create new PCMSynth instruments by merging your rack.
Keyable BPM

New effects:
- Octaver
- Vibrato
- Tremolo
- AutoPan

Machine improvements:
PCMSynth: Stereo sample support
Modular: Added stereo out to machine input component
Bassline: Custom waveform support
8BitSynth: Random equation generator

Patterns show preview of notes
Quick jump table replaces machine list
Create machine by double tapping empty slot
Automation editor workflow visual crosshairs

Wave editor enhancements:
- Stereo support
- Effect support
- Timestretch/pitchshift
- BPM detection
- Insert silence
- Time ruler w/snap

Added mixer + transport MIDI mappings
Added support for using MIDI notes as CC triggers

Effect bypass is now keyable

Improved typing keyboard with uppercase/lowercase support

New loop and stem export options

More keyboard key width options for large screens

Ratings and Reviews

4.5 out of 5
23 Ratings

23 Ratings

ketwig ,

Mr Rhythm

Excellent app for creating music. Holds it’s own against any DAW I’ve seen imo. The only issue I have is the fact you can’t use this app with Bluetooth earphones or speakers which is a little annoying as Bluetooth earphones and speakers dominate the market right now. Maybe an update is due to make the app compatible with Bluetooth devices? Other than that this is a quality app and I would recommend to anyone looking to make tracks on the fly.

MisterMiserable ,


I’ve used virtually all the iOS DAWS available and must honestly say that both in terms of workflow and indeed, ease of use, nothing beats Caustic.
The automation is an absolute joy in it’s direct simplicity as is the superb sequencer which employs a method of input that is truly second to none.
Simply put, Caustic is an amazing achievement from an independent company that quite easily stands up against (and in so many ways actually surpasses!) the likes of the ‘Big Guns’ of Korg Gadget and Apples’ GarageBand.
I’d absolutely love to see some more updates (it’s been sadly, such a long while) such as new synths added and an increase in the polyphony (say 16 or 32) but even as it is now - Caustic is quite simply a superb piece of programming and if you’re at all interested in making music on iOS then you absolutely owe it to yourself to give it a go.

Sillysocks79 ,

iPhone creative outlet

I’ve had Caustic for a while now - due to a busy daily routine it’s actually become my primary music creation tool. I grew up on Cubase (20+ years!), so to be able to do so much on my phone still astounds me.
I love the depth you can get in to with the drum machine - it’s so easy to load in external samples to play with, too.
I’ve yet to delve in to the vocoder, but a friend of mine seems to be using it like an audio track.

This is truly an excellent app, and such incredible value - Thank you Caustic!

App Privacy

The developer, Rejean Poirier, has not provided details about its privacy practices and handling of data to Apple.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


  • Family Sharing

    Up to six family members can use this app with Family Sharing enabled.

More By This Developer

You Might Also Like