Comparison

FM Playground vs Prospero Audio

Price, ratings, monetisation and update history for both apps, side by side โ€” with what reviewers say about each.

Head to head
About

FM Playground

Features
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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.

About

Prospero Audio

Features
Read full description

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

FM Playground4 screens
Prospero Audio4 screens

Verdict

The call

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

CostPrice ยท In-app purchases ยท Ads ยท Monetization

Both are free to download. Prospero Audio sells 1 one-off in-app purchase. FM Playground asks for nothing beyond the download.

Scorecard1 real difference ยท 5 level
FM Playground versus Prospero Audio: the parameters behind the verdict, then further details
ParameterFM PlaygroundProspero Audio
PriceFreeFree
Update frequencyEvery 3 daysโ€”
AdsNoNo
In-app purchasesNo โ€” betterYes
DevicesiPhone, iPadiPhone, iPad
Requires iOS26.026.0
Further details โ€” not scored
Size19 MB2 MB
Age rating4+4+
DeveloperGwangyu LeeBrenton Mumford

In-app purchases

None

FM Playground

No in-app purchases

1 purchases

Prospero Audio

One-time1
  • Go Pro!$6.99

Questions

Is FM Playground free?
FM Playground is free to download, with no in-app purchases.
Is Prospero Audio free?
Prospero Audio is free to download, with in-app purchases available.
Do FM Playground or Prospero Audio have ads?
Neither FM Playground nor Prospero Audio shows ads.

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