Esmuc V1 vs FM 304
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Esmuc V1
This application provides access to a sample set of the Grenzing organ from the Catalonia College of Music. It allows users to play the instrument using MIDI keyboards and pedals connected to their iOS or macOS devices, with all necessary sound and image files included.
- Grenzing organ sample set
- MIDI keyboard and pedal support
- iOS and macOS compatibility
- Integrated sound and image files
- Large download size (1.3 GB)
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This app makes the sample set of the Grenzing organ of the Escola Superior de Música de Catalunya (Catalonia College of Music) available for playing with MIDI keyboards and a MIDI pedal connected to your iOS or macOS device. To learn about the instrument, please visit http://samplesets.esmuc.info/ . Sound and image files are incorporated into the app with the kind permission of the sample set creator, Pere Casulleras, so you don't need to download and install any additional data. For more information about the app and the underlying Napo framework, please visit the support page http://polaron.de/Esmuc/ , the Napo documentation at http://polaron.de/Napo and in particular the user manual at http://polaron.de/Napo/manual . *** For your attention *** This app is a huge download of about 1.3 GB. Make sure there is enough free SSD space on your device.
FM 304
Create music with three powerful FM synthesizers, each featuring integrated sequencers and onboard effects. This app offers intuitive real-time control over all synth parameters for quick sound design and tune creation.
- Three 4-operator FM synths
- Integrated sequencers
- Onboard delay, reverb, and chorus effects
- One knob per function control
- 100 save slots
- 8 algorithms
- Note frequency quantize
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FM 304 — 3x FM Synth Groovebox FM 304 is a powerful trio of 4-operator FM synthesizers, each with its own sequencer and effects. Built for fast, hands-on sound design, every parameter is available with a one-knob-per-function layout — no menus, no digging. Create evolving patterns, punchy sequences, and complex FM textures in seconds. Everything is on screen, ready to tweak, making it easy to move from idea to finished loop without breaking flow. Features • 3 independent 4-operator FM synthesizers • Immediate one-knob-per-function control • 3x 16-step sequencers (one per synth) • Built-in effects: delay, reverb, chorus • 3x LFOs for modulation • 8 FM algorithms • Note frequency quantisation • 100 save slots Designed for speed No menu diving. No setup. Just pure FM synthesis with everything visible and playable.
Screenshots
Verdict
The clearest difference is price: FM 304 at $3.99 against Esmuc V1's $9.00. Esmuc V1's advantage is update cadence (every 10 months vs every 43 months) and rating (5.0 vs 4.8). On review sentiment, ratings volume, in-app purchases and monetization model there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Esmuc V1 costs $9.00 and FM 304 $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Esmuc V1 holds the better App Store score, 5.0 against 4.8. Both are backed by a comparable volume of ratings — 2 and 5 respectively. Written reviews split almost evenly too, at 100% and 100% positive.
Esmuc V1 ships an update every 10 months, FM 304 every 43 months. Both last shipped on November 2, 2026.
| Parameter | Esmuc V1 | FM 304 |
|---|---|---|
| Price | $9.00 | $3.99 — better |
| Rating | 5.0 (2 ratings) — better | 4.8 (5 ratings) |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| Number of ratings | 2 | 5 — better |
| Update frequency | Every 10 months — better | Every 43 months |
| Ads | No | — |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod, Mac — better | iPad |
| Requires iOS | 12.5.6 | 12.0 — better |
| Further details — not scored | ||
| Size | 1.1 GB | 17 MB |
| Age rating | 4+ | 4+ |
| Developer | Markus Sigg | Paul Betowski |
Customer experience
Esmuc V1
FM 304
In-app purchases
Esmuc V1
No in-app purchases
FM 304
No in-app purchases
