Comparison

SpectrumGen vs BounceBud Physics Based MIDI

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

Head to head
About

SpectrumGen

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
Read full description

SpectrumGen is a spectral synthesizer with a minimalistic pixel interface. It's a bit like the PixelWave, but now you can draw the spectrum of sound! Key features: • it is possible to draw the spectrum and play it at the same time; • export to WAV; • eight predefined timbres; • changeable number of octaves (from 2 to 8); • MIDI keyboard support; • Audiobus and IAA support. Dark colors - low frequencies (bass). Bright colors - high frequencies.

About

BounceBud Physics Based MIDI

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
Read full description

BounceBud is a physics based, generative MIDI sequncer. Each side of the app has a customizable keyboard that send a MIDI note when a ball collide with its key. You can specify the ball count, speed and size on the main screen with the knob controls.  In the settings menu, you can set the key/scale, velocity range, octave. range and MIDI channel settings of the keyboards. You can also specify the notes individually per keyboard. All keyboards share the same key/scale that could also be changed with BrainBud. Each keyboard has its own MIDI output, so you can play different audio apps with BounceBud at once. Or you can disable the keyboard sides you don't want to use. With a MIDI input (from a MIDI keyboard or a MIDI sequencer app) you can 'shoot walls' from the keyboards. Balls can interact with the walls and it introduce more randomness to your generative sequence. You can control each keyboard by assigning them different MIDI input channels in the settings menu. You can also toggle the ball collision behavior in the settings menu. Whether balls can collide with each other or not, it creates different, interesting sequences every time. The size variety and ball variety can be change in the ball settings section in the settings menu. It adds randomisation to the size and speed values. You can change the ball color theme in the settings menu as well! BounceBud is a MIDI app and it does not produce any sound on its own. You need to route BounceBud's MIDI outs to your audio app's MIDI input. The AUv3 plugin app needs and AUv3 host app such as AUM, Loopy Pro, Logic Pro, Cubasis, Nanostudio, apeMatrix etc.

Screenshots

SpectrumGen1 screens
BounceBud Physics Based MIDI4 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard4 real differences · 6 level
SpectrumGen versus BounceBud Physics Based MIDI: the parameters behind the verdict, then further details
ParameterSpectrumGenBounceBud Physics Based MIDI
Price$0.99 — better$3.99
Rating4.4 (10 ratings)5.0 (11 ratings) — better
Positive reviews73.7% of reviews100.0% of reviews — better
Number of ratings1011 — better
Update frequencyEvery 14 monthsEvery 5 weeks — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS12.0 — better13.0
Further details — not scored
Size3 MB6 MB
Age rating4+4+
DeveloperAlexander ZolotovCem Olcay

Customer experience

SpectrumGen

All ratings10 ratings
Positive80.0%
Neutral20.0%
Negative0.0%
Written reviews19 reviews
Positive73.7%
Neutral21.1%
Negative5.3%

BounceBud Physics Based MIDI

All ratings11 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews10 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

SpectrumGen

No in-app purchases

None

BounceBud Physics Based MIDI

No in-app purchases

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.

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