# SpectrumGen vs BounceBud Physics Based MIDI

The clearest difference is rating: BounceBud Physics Based MIDI at 5.0 against SpectrumGen's 4.4. BounceBud Physics Based MIDI also leads on update cadence (every 5 weeks vs every 14 months) and review sentiment (100% vs 74%). SpectrumGen's advantage is price ($0.99 vs $3.99). On ratings volume, ads, in-app purchases and monetization model there is nothing between them.

SpectrumGen costs $0.99 and BounceBud Physics Based MIDI $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

BounceBud Physics Based MIDI holds the better App Store score, 5.0 against 4.4. Both are backed by a comparable volume of ratings — 10 and 11 respectively. Written reviews point the same way: 74% of SpectrumGen's written reviews are positive against 100% of BounceBud Physics Based MIDI's.

SpectrumGen ships an update every 14 months, BounceBud Physics Based MIDI every 5 weeks. The most recent releases landed on September 17, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | SpectrumGen | BounceBud Physics Based MIDI |
| --- | --- | --- |
| Price | **$0.99** | $3.99 |
| Rating | [4.4 (10 ratings)](https://appshunter.io/ios/app/spectrumgen/id455656272/reviews) | **[5.0 (11 ratings)](https://appshunter.io/ios/app/bouncebud-physics-based-midi/id6464171933/reviews)** |
| Number of ratings | 10 | **11** |
| Positive reviews | 73.7% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 14 months | **Every 5 weeks** |
| Monetization | Paid | Paid |
| Size | 3 MB | 6 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Alexander Zolotov](https://appshunter.io/developer/324462547) | [Cem Olcay](https://appshunter.io/developer/523633853) |

## What reviewers say

### SpectrumGen

[App page](https://appshunter.io/ios/app/spectrumgen/id455656272)

Create unique sounds by drawing their spectral representation. This synthesizer offers real-time sound generation and export options, with customizable octaves and MIDI support for enhanced musical expression.

**Highlights:** Draw sound spectrum in real-time, Export to WAV format, Eight predefined timbres, Adjustable octaves (2-8), MIDI keyboard support, Audiobus and IAA compatible

**Features:** macOS Compatibility

**In-app purchases:** none


### BounceBud Physics Based MIDI

[App page](https://appshunter.io/ios/app/bouncebud-physics-based-midi/id6464171933)

This app generates MIDI notes through a unique physics-based system. Balls collide with customizable keyboards, triggering MIDI events. It offers extensive control over note scales, velocity, and MIDI channels for diverse musical creations.

**Highlights:** Physics-based generative MIDI sequencing, Customizable keyboards with MIDI note triggers, Adjustable ball count, speed, and size, Configurable key/scale, velocity, and octave ranges, Individual MIDI output per keyboard, MIDI input for 'shoot walls' interaction, Toggleable ball collision behavior

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is SpectrumGen free?

SpectrumGen costs $0.99, with no in-app purchases.

### Is BounceBud Physics Based MIDI free?

BounceBud Physics Based MIDI costs $3.99, with no in-app purchases.

### Which has better reviews, SpectrumGen or BounceBud Physics Based MIDI?

BounceBud Physics Based MIDI is rated higher. SpectrumGen averages 4.4 out of 5 from 10 ratings, while BounceBud Physics Based MIDI averages 5.0 from 11 ratings.

### Do SpectrumGen or BounceBud Physics Based MIDI have ads?

Neither SpectrumGen nor BounceBud Physics Based MIDI shows ads.

### Which is updated more often, SpectrumGen or BounceBud Physics Based MIDI?

SpectrumGen ships an update every 14 months, and BounceBud Physics Based MIDI every 5 weeks. Most recently, SpectrumGen was updated on September 17, 2026 and BounceBud Physics Based MIDI on September 21, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*