Rithmatic: FM Synth

Rithmatic: FM Synth

AUv3 plugin, 36,000 patches

4 ratings
2 reviews
Free

Details

  • Released
  • Updated
  • August 7, 2026
  • October 9, 2026

Features

Rithmatic: FM Synth screenshot #1 for iPhone
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Rithmatic: FM Synth screenshot #7 for iPhone
Rithmatic: FM Synth screenshot #8 for iPhone
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About

This app is an FM synthesizer featuring a vast library of classic voices. It allows users to explore, learn, build, and blend sounds using an intuitive interface and an AUv3 plugin for DAWs. It offers a comprehensive synthesis engine and various playback options.

✓36,118 classic DX7 voices included
✓AUv3 plugin for DAWs
✓Patch Builder to learn FM synthesis
✓Sound blending feature
✓On-screen and MIDI keyboard support
✓Arpeggiator and latch function
✓WAV export
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What's New in Rithmatic

1.2.0

October 9, 2026

Rithmatic 1.2 brings dark mode, five tunings, keys you can resize, and help that's easy to find. And if you missed 1.1: Rithmatic plays inside your DAW as an AUv3 instrument. NEW IN 1.2 - Dark mode: Rithmatic follows your device's appearance, or choose Light or Dark in Settings > Look. The black screen at the top stays the same in both - Tuning, in Settings > Sound: equal temperament, just intonation, or Wendy Carlos's Alpha, Beta and Gamma scales, which never return to the octave. With thanks to her in About - Drag the handle on top of the on-screen keys to make them taller or shorter; double-tap it to reset - The bar above the pads slides back the moment you scroll up, from anywhere in the grid - Settings > Help & support has Keys and shortcuts (play from a hardware keyboard: A to K for the white keys, W E T Y U for the black, by position, so German and French keyboards play the same notes) and Synth terms, every plain-words explanation in one place - Blend results play on the built-in synth, no hardware needed - The Patch Builder keeps your edits when you switch tabs and come back - Recordings catch pad and catalog auditions, and leave 1 dB of headroom for a DAW or an editor - Patch info from a pad shows its tags, similar sounds, Blend and Share - Volume and the patch sets you switch off are remembered - Banks you export or send to a synth keep the names you give patches - Side panels fill the screen edge to edge on iPhone and share one header; they open below the header, so Record and Stop stay in reach - Easier to read and use: stronger contrast in dark mode, clearer icons, switches beside their labels on iPhone, and VoiceOver names every control - Record, mapped to a MIDI controller, now starts and stops recording STILL NEW FROM 1.1 - AUv3 instrument: put Rithmatic on a track in GarageBand on iPad, or in an Audio Unit host on the Mac. Its window is the app's own Patches screen and Patch Builder, with your library; your bank is its presets, and Brightness, Attack, Decay, Release and Feedback can be automated - Essentials: the DX7 sounds you know from records, each with why it is famous and the songs to hear it in - Patch Builder: each operator's envelope and tuning, the LFO and the pitch envelope, and FEEL for thickness, touch and brightness in plain words - Blend: pick two patches and get eight new ones, each with its own play button - Arpeggiator: up, down, up and down, random or as played, over one to three octaves, with Latch - Every MIDI keyboard plays: pitch bend, mod wheel, breath, sustain and aftertouch - Mono, legato, glide and glissando, and a truer DX7 sound: exact timing, feedback in every algorithm, the hardware's detune - The waveform follows what you play, with a Scope look; Patch of the day, in the app and as a widget - Open .syx banks from Files, Mail or AirDrop, export your bank as .syx, and Share Sound as a short clip

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User reviews

Wish it was an auv3

It’s great but not a plugin.😔

Response from developer

Great point! On it, thanks so much for your feedback :)

Exceptional sounds

Impressive synthesizer,unique and deep!

Response from developer

Thanks so much for the kind words! Glad you're finding value in there :)

Developer apps

FAQ

What is Rithmatic: FM Synth?

Rithmatic: FM Synth is a powerful FM synthesizer that comes with over 36,000 classic DX7 voices. It functions as an AUv3 plugin for use in DAWs like GarageBand on iPad and Ableton Live on Mac, allowing for extensive sound design and manipulation.

Does Rithmatic: FM Synth have ads?

No, Rithmatic: FM Synth is ad-free. The description explicitly states 'No account, no ads, nothing locked,' ensuring an uninterrupted user experience.

What devices does Rithmatic: FM Synth support?

Rithmatic: FM Synth is available on Mac, iPhone, and iPad. It also supports iPods, making it accessible across a range of Apple devices.

How many patches are included with Rithmatic: FM Synth?

The app includes a massive library of 36,118 unique DX7 voices right out of the box. These patches are readily available without any additional downloads or network connections.

Can I learn FM synthesis with Rithmatic: FM Synth?

Yes, Rithmatic: FM Synth features a Patch Builder designed to help users understand FM synthesis. It visually represents operators and algorithms, explaining jargon in plain terms.

What is the price of Rithmatic: FM Synth?

Rithmatic: FM Synth is available for free. There are no costs associated with downloading or using the core features of the synthesizer.

How often is Rithmatic: FM Synth updated?

The latest version of Rithmatic: FM Synth is 1.2.0, which was released on October 9, 2026. This indicates a recent update, suggesting ongoing development and support.

Can I record and export my creations from Rithmatic: FM Synth?

Yes, Rithmatic: FM Synth allows you to record your performances and export them as WAV files. This feature enables you to easily share or integrate your synthesized audio into other projects.