Pure Acid is a top quality bassline synthesizer and drum machine in one app! Inspired by classic hardware bassline synthesizers and rhythm machines, which changed musical world back in 80's, like the legendary TB-303 synthesizer, TR-808 / 707 / 909 rhythm boxes and their numerous replicas, Pure Acid is designed to bring back the feeling of retro analog gear in every detail in terms of sound, as well as to provide new functions previously unavailable in the original devices to make your music creation workflow fast and fun! A large number of factory preset patterns will immerse you into an exciting world of Acid House, Techno, Hardcore and Big Beat music genres, which will inspire you to create your own basslines and rhythms for your compositions!

You can use Pure Acid app as a ready-to-go realtime musical instrument (groove box) in your jam sessions together with Ableton Link to synchronize it with the rest of your music gear. Its bassline editing system and randomization options will be handy to create unique groovy basslines easily. Realtime master effects with XY-pad controls can add expression to your live performance. You can also use Pure Acid with AudioBus, AUM or other IAA-supporting apps to create complex and interesting sound setups.


• supports Ableton Link, AudioBus, Inter-App Audio, Core Midi, Virtual Midi In, Bluetooth Midi In
• AudioBus state saving support
• 64-bit sound engine
• Midi Learn
Note: AUv3 support is not implemented yet, but it is planned in the future updates.

Bassline Section:

• 2 classic bassline waveforms: Saw and Pulse
• classic knobs: Tune, Cutoff, Resonance, Env Mod, Decay and Accent
• Distortion effect with amount, HPF and Boost knobs
• filter LFO with rate and depth knobs

Sequencer Section:

• up to 12 bassline patterns can be stored in one preset
• up to 32 steps per each bassline pattern
• patterns can be chained together to create more complex patterns
• pattern Tempo and Swing parameters
• Gate parameter, which allows you to adjust bass note lengths
• Pattern Editor allows you to copy, transpose patterns, shift notes left/right, insert or delete a note, variate (randomize all note properties expect pitch), shuffle (randomize notes order only), reverse and compose patterns using Bassline Composer function
• onscreen keyboard allows you to enter bassline notes in a comfortable way. You can also record basslines in realtime.

Drums Section:

• 16 independent drum parts
• 35 different classic drum sounds with ability to tune your own drum kit
• each drum part sound has its own parameters: Tune, Decay, Attack/Snap/Color, FX A send, FX B send, Boost, Pan, Level
• up to 12 drum patterns and 4 drum fill patterns per preset
• 16 steps per each drum pattern, with ability to add 16 "backbeat" steps between main steps
• patterns can be chained together to create more complex patterns
• Swing and Flam features
• Total Accent part with adjustable total accent value can give you ability to "highlight" specific steps in your drum pattern

Mixer Section:

• 2 mixer channels: Bassline and Drums
• Drive effect for each channel
• 2 send effect pedals: FX A and FX B
• 14 send effect types
• send effect can be routed to either master output, MFX or another send effect (FX A -> FX B), which allows to chain several effects one after another
• MFX pedal with 22 effect types to choose from
• FX A and FX B send amount knobs for each mixer channel
• XY-pad on each effect pedal to control their parameters
• Master Limiter effect to prevent sound clipping

and more:

• Unlimited number of user presets
• 65 factory presets
• Audio export to wav file (16, 24 or 32 bit)
• Preset / Bank Share function
• Selectable UI color schemes with ability to adjust colors manually
• Designed for both iPad and iPhone

What’s New

Version 1.0.5

- fixed crash when using very low notes in the bassline;
- pitch range of recorded/stored bassline notes is limited to -2..+2 octaves to prevent crashing;
- added: now you can switch bassline and drum patterns via Midi In using Midi Program Change events;
- minor fixes and stability improvements.

Ratings and Reviews

5.0 out of 5
40 Ratings

40 Ratings

Guycoolio ,

Fantastic TB-303 Suite

I remember back in 1996 (or 1997?) being blown away by a new program called Rebirth 338 by Propellerhead. I could not believe how a piece of software could capture so well the vibe of real analog gear. Well Pure Acid just gave me that same feeling! Kudos to the developer!!

Pure Acid is the best TB-303 emulator on IOS! It comes with classic drum sounds, killer effects, authentic sound and 303 sequencer mayhem! It is simply the complete package to cover almost all your Acid base-line needs. Pure Acid is also so much easier to program and allows for the easy generation of new riffs. Works with Ableton sync and IAA. Works on IPad and IPhone. AU3 is the only other wish list item that is needed. Just download it already.

JohnFBP ,

Nu favourite app

Been waiting for a technobox2/rebirth replacement forever. THIS IS IT. This app shines in song mode. Get a few patterns looping then record a live take with the MFX and drum mutes. Very similar to recording live takes with actual hardware...maybe because all the controls are on the page idk. This is an instant buy.

Note to dev: 1. Thank you! 2. Anyway there could be a way to separate the bass and drum channels in AUM? Either way, thanks for the great work.

TheRealDutchee ,

Absolutely fantastic!

Super happy with this app. Making grooves with this app is a breeze and incredible fun. I got a lot of different grooveboxes and drummachines, but none of them are as much fun as this app. Grab this little gem and you will not regret it, that is a promise 😎👍 Already amazing as it is now, but looking forward where the developer is going to take this with future updates. Super duper!!! 🤩🤗 ⭐️⭐️⭐️⭐️⭐️


Dmitrij Pavlov
23.9 MB

Requires iOS 10.0 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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