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FRMS - Granular Synthesizer

FRMS - Granular Synthesizer

4-layer granular with FM

285 ratings
123 reviews
🎬 Entertainment
🎵 Music
$8.99
In-App Purchases

Details

Released
March 23, 2020
Updated
October 23, 2026

Features

Developer

Imaginando Lda
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FRMS - Granular Synthesizer screenshot #1 for iPhone
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FRMS - Granular Synthesizer screenshot #7 for iPhone
FRMS - Granular Synthesizer screenshot #8 for iPhone
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About

This app offers a powerful and flexible layering system for creating unique audio experiences. It blends multiple synthesis types, allowing users to craft everything from ambient soundscapes to glitchy textures. Import your own sounds or use the curated library for endless sonic exploration.

✓4 Synthesis Engines per voice
✓FM Modes & Operator Stacking
✓Real-Time Granulation
✓Deep Modulation & Envelope Control
✓Advanced FX & Polyphony
✓MPE Compatibility
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What users say about FRMS

Reviews of FRMS are mostly positive: the Music app is rated 4.8/5 from 285 App Store ratings. What users like most: fantastic sound design, intuitive and well-designed interface. Top complaints: CPU-intensive, can cause performance issues, bluetooth connectivity problems. Summarized from real user reviews.

Positive things

  • 🎨Fantastic sound design
  • 👍Intuitive and well-designed interface
  • 🎶Inspiring and creative sound possibilities
  • 💻Works great on iPad and desktop
  • 🔑Excellent preset packs

Negative things

  • 🔋CPU-intensive, can cause performance issues
  • 🔇Bluetooth connectivity problems
  • 💰Expensive in-app purchases
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What's New in FRMS

1.14.0

October 23, 2026

- Cropping can now be applied to samples from factory and expansion packs. - Cropping a sample no longer overwrites the original file. - Samples can be dropped onto the waveform from the iOS Files app. They're copied into Imported folder. - Randomize no longer changes a layer's Free/Key setting. - Fixed selecting a region of the waveform. - Fixed a crash when clearing a layer's sample - Fixed the AUv3 playing nothing from its host when MIDI channel 1 had been turned off in the standalone app. - Fixed parameter jittering when changed from host. - Fixed a crash when the host changed the Keyboard Scale or Keyboard Root Key parameters. - Fixed a crash when switching a layer to live input mode when hosted. - Fixed recording multiple layers at the same time. - Fixed crashes when starting or stopping a recording into a layer. - Fixed cropping a layer's sample adding silence in front of the audio. - Fixed notes staying silent in MONO or UNISON with legato on after playing in POLY. - Fixed one side of the reverb occasionally losing its tail until FRMS was reloaded. - Fixed the on-screen keyboard's zoom and scroll position resetting on every launch.

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80

Subscriptions & In-App Purchases

$8.99

Supremeja Music Preset Pack

Cinematic soundscapes for emotive scenes

User reviews

Most RecentHighest RatedLowest Rated

Amazing app

I love the app. It’s a really great concept and I’m actually in college right now learning all of these things which is why I downloaded the app because I needed to do projects in class and I did not own a MacBook. This was the best option I had in terms of doing research and figuring out what would help me the most, however there are some slight accessibility limitations. I am a blind User and really enjoy sounds it’s my passion. it’s something that I want to turn into a career when I’m out of college and this just inspires me even more it has sounds that I’ve never heard before again the accessibility limitations are there, but I have managed to navigate them somewhat. The only thing I would request is maybe some more information about the update you’re doing with the midi input/recording for audio live input it does not seem to work with what I have and it seems to crash every time I turn even just one layer on. I wonder if this is an ongoing thing I would love to be in the loop of the development of this app though it is impressive.
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AAnderson/24,000

Incredible sampler and synth combo...

This one is probably gonna be one of the most useful tools in a musicians toolbox, with mindboggling possibilities and beautifully complex sounds with an almost effortless worksurface. This developer delivers on this and all his other apps especially the synth ones like this and the drc.
EEC0Sphere

Fantastic Synth

I love this synth because it has such a unique sound, and it works really well as an AUV3, including in BAM, which you should also check out.
RRRobert Reynolds

Response from developer

Glad FRMS is delivering that unique sound for you, and great to hear it's working smoothly as an AUV3 inside BAM too. Thanks for the shoutout to BAM, and for taking the time to write this 🙏

MehrspurAufnahmen in Cubasis 3.8.3

Ich versuche mit diesem ios Synth als Audiounit Mehrspuraufnahmen zu machen, aber dies funktioniert nicht. Es werden zwei Audio Units von FRMS geladen, doch wenn ich das Programm schließe und wieder öffne, wird die weitere Spur nicht mehr mit dem FRMS geladen. Gibt es eine Klärung für das Problem - mit anderen iOS Synths klappt dies? Wakanoa
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WWakanoa

Response from developer

Vielen Dank für diese Meldung, wir schätzen die Details sehr. Es sieht so aus, als gäbe es ein Problem damit, wie FRMS den Zustand verwaltet, wenn mehrere AUv3-Instanzen in derselben Sitzung geladen sind. Wir haben das Problem erfasst, und das Team wird sich das ansehen. Könntest du uns in der Zwischenzeit mitteilen, welche DAW/Host-App du verwendest? Das würde uns helfen, das Problem schneller nachzuvollziehen.

A special synthsiser

This is a lovely, stable, powerful, flexible synthesiser.
Great design. Works well on phone and iPad.
The IAPs are very high quality and interesting.
My go-to granular. 5 stars for sure. Thanks. 👍🏼🎶
RSRiverbend Sim

Response from developer

We’re thrilled to hear that FRMS is your go-to granular! That means a lot to us. We’re also glad you’re enjoying not only FRMS but its expansion packs as well. That’s awesome 😁

See 118 more reviews

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User experience

🐞

Reported Bugs

2 issues

Crashes and audio glitches in certain DAW environments

Bug

Issues with sample playback and freezing

Bug
✨

Requested Features

4 requests

Ability to import larger sample files

Feature

More granular control over modulation parameters

Feature

Undo/redo functionality

Feature

Improved MIDI integration and learn capabilities

Feature

FAQ

What does FRMS do?

FRMS is a versatile synthesizer app that combines Granular, FM, Additive, and Subtractive synthesis in a layering system. It allows users to create a wide range of sounds, from ambient drones to glitchy textures, by combining up to four synthesis layers per voice.

What are the key features of FRMS?

Key features include four distinct synthesis engines (Granular, FM, Additive, Subtractive) with four layers per voice, FM modes and operator stacking for complex tones, real-time granulation of samples or live audio, deep modulation and envelope control per layer, advanced effects like delay and reverb, and MPE compatibility.

How much does FRMS cost?

The app is available for free, but it offers in-app purchases. This suggests that while the core functionality may be accessible, certain advanced features, presets, or additional content might require a purchase.

Who is FRMS for?

FRMS is designed for both beginners and advanced sound designers. It's ideal for musicians and producers who want to explore complex sound creation, experiment with granular and FM synthesis, and create unique audio textures for their music.

Can I import my own sounds into FRMS?

Yes, you can import your own sounds into FRMS for granulation. The app also provides a curated sample library and the ability to capture live audio, offering flexibility in how you create your sounds.