FM Playground vs Prospero Audio
Price, ratings, monetisation and update history for both apps, side by side โ with what reviewers say about each.
FM Playground
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FM Playground is an educational app designed for learning and experimenting with FM synthesis (Frequency Modulation Synthesis). Developed as part of the "2025 Swift Sound - Creative Coding for Computer Musicians" project at MARTE Lab, Department of Multimedia, Dongguk University, by Yeonho Kim, Taejun Kim, Seoyul Son, and Sookyung Yoon, with guidance from Gwangyu Lee. The app features multiple interactive views where users can manipulate sound in real time using touch gestures and iPhone sensors (gyroscope, compass, etc.). Key Features: - What is FM Synthesis?: Learn the fundamentals of FM synthesis with an interactive view. Adjust sliders to hear real-time modulation effects and explore complex timbres. - Gesture-based control of timbre, frequency, and volume across various interactive views. - Open-source code available for study, experimentation, and expansion.
Prospero Audio
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Three gestures. Infinite music. Prospero (thanks to Apple's Vision framework) tracks your hand position and maps it based on your selections. Three simple gestures give you complete expressive control. Use the built-in synth in Audio mode, or switch to MIDI mode and connect to GarageBand, AUM, Loopy Pro, or any CoreMIDI-compatible app or hardware synth. The only limitation is your creativity. Free features include: - Connect to any CoreMIDI app or external device - MIDI & Audio mode with built-in synth - Per-pitch aftertouch - VEL & MOD real-time controls - Reverb and echo Pro adds: - Up to 4 hands tracked simultaneously - Choose any scale and key - Built-in 4-waveform polyphonic synth - All chromatic, modal & pentatonic scales - Per-hand MIDI channel routing - Synth glide/portamento & attack/release envelope - More built-in audio effects like fuzz, tone, and more
Screenshots
Verdict
The clearest difference is in-app purchases: FM Playground at none against Prospero Audio's 1. On price, ads, device support and iOS requirement there is nothing between them.
Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS
Both are free to download. Prospero Audio sells 1 one-off in-app purchase. FM Playground asks for nothing beyond the download.
| Parameter | FM Playground | Prospero Audio |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 3 days | โ |
| Ads | No | No |
| In-app purchases | No โ better | Yes |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 26.0 | 26.0 |
| Further details โ not scored | ||
| Size | 19 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | Gwangyu Lee | Brenton Mumford |
In-app purchases
FM Playground
No in-app purchases
Prospero Audio
- Go Pro!$6.99
Questions
Is FM Playground free?
Is Prospero Audio free?
Do FM Playground or Prospero Audio have ads?
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