It’s not an emulation or simulation of the TB-303 synth. It is an homage to TB-303, and other hardware synths. It’s a complete different beast, but it has the same functionality. It growls and barks with fierce resonance. SquareAcid is a singular squeal, squelch, and bleep machine.

It comes as a stand alone app with Audiobus and Ableton Link. It also comes with an AUv3 audio unit plug-in.



Ableton Link



What’s New

Version 1.2.11

- [Fixed] Update Audiobus for iOS 14.

Ratings and Reviews

4.6 out of 5
5 Ratings

5 Ratings

Guycoolio ,

Rubbery Like A TB-303

I am going out on a limb and say that SquareAcid responds the most accurately like hardware to knob changes than any other TB-303 or SH-101 emulator on IOS. Honestly, simple knob adjustments actually create new polyrhythms within the beat similar to real hardware units. Adjust the accents, filter envelope, or cutoff, and you can hear the entire character of a repetitive sequence change. Run it through a delay like Yukawa and you are off to some serious hypnotic acid adventures without having to alter the notes of the sequence itself. This is special because usually a repeating sequence becomes boring very quickly even with automation.

Sonically, it competes well against Troublemaker, 2XB303, Pure Acid, etc. SquareAcid is not as feature rich as Pure Acid (another monster). No automatic generator of sequences as of this writing. Only a distortion effect (which is excellent) is currently available. But SquareAcid captures the vibe of hardware knob tweaking in a way that is exceedingly gratifying. Definitely well done. Kudos to the developer!

anickt ,


It’s got a different sound. Grungy! Like it!

App Privacy

The developer, James Navarro, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer's privacy policy.

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More


James Navarro
5.8 MB

Requires iOS 13.0 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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