Comparison

76477 Complex Sound Synth vs Musical Kittens

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

Head to head
About

76477 Complex Sound Synth

Create complex sound effects and music with a powerful synthesizer inspired by vintage hardware. Offers extensive modulation, noise generation, and customizable envelopes. Easily share your creations and control it with MIDI devices.

Highlights
  • Three oscillators with multiple wave types
  • Modulation capabilities for oscillators
  • Adjustable noise generator with filter
  • Configurable ADSR envelope
  • Unlimited sound effect generator boards
  • MIDI input support
  • Export/import sound effect boards
Features
Read full description

Synth 76477 is a powerful sound effects generator and synthesizer app, inspired by the famous SN76477 integrated circuit from the 1970s, but containing many enhancements. Features: • Three oscillators, each of which can produce a sine, triangle, sawtooth, or square wave • The outputs of two of the oscillators can be used to modulate the main oscillator • Frequency modulation can be linear or octave based • The duty cycle of the main oscillator can be adjusted in square wave mode • Noise generator, either analog or digital, with an adjustable low pass filter • Oscillator outputs can be mixed to the audio output • Fully configurable ADSR (Attack / Decay / Sustain / Release) envelope, linear or exponential • One shot mode available • Unlimited number of sound effect generator boards • User configurable array of sound effect generator buttons on each board, up to 50 on the iPhone and 150 on the iPad • Boards as well as individual generators can be exported and imported, and transferred to and from your computer via iTunes file sharing, making it easy to share with others Synth 76477 comes with a full set of sample sound generators, making it easy to understand how to use and configure them, and tap the full power of the app. Synth 76477 works with MIDI input devices (keyboards and controllers) in several interesting ways: If you plug a MIDI device into an iPad (via the USB Camera Connection Kit), Synth 76477 will automatically use it. You can plug several MIDI controllers in via a powered HUB, and Synth 76477 will use all of them. You can also use MIDI controllers over WiFi. Midi controllers can be used to trigger chip playback, or set the VCO frequency and volume. They can also be used in the chip editor to adjust the various settings. The app also supports Bluetooth audio devices. Visit the support page for step by step instructions on how to use the app: http://www.blackcatsystems.com/ipad/complex_sound_synthesizer_FAQ.html Buy your copy right now, and start generating your own sound effects in minutes.

About

Musical Kittens

Create unique musical compositions using adorable cat meows as sound effects. This application allows you to craft memorable cat music, save your creations, and share them with friends to impress them with your musical talent.

Highlights
  • Cat meow sound effects
  • Musical composition
  • Save songs
  • Share creations
  • Unique sound library
Features
Read full description

Musical Kittens is an amazing musical composer application where all of the sound effects are generated with adorable cat meows! This app will change your life forever. Meow your way to fame and glory by making memorable cat music. Save your songs and share them with friends! Everybody will think you are so cool!

Screenshots

76477 Complex Sound Synth4 screens
Musical Kittens4 screens

Verdict

The call

The clearest difference is review sentiment: Musical Kittens at 100% against 76477 Complex Sound Synth's 50%. Musical Kittens also leads on price (Free vs $2.99) and rating (4.3 vs 3.9). 76477 Complex Sound Synth's advantage is in-app purchases (none vs 1) and ads (none vs shown). On ratings volume and device support 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

Musical Kittens is free to download; 76477 Complex Sound Synth costs $2.99 up front. Musical Kittens sells 1 one-off in-app purchase. 76477 Complex Sound Synth asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Musical Kittens holds the better App Store score, 4.3 against 3.9. Both are backed by a comparable volume of ratings — 9 and 6 respectively. Written reviews point the same way: 50% of 76477 Complex Sound Synth's written reviews are positive against 100% of Musical Kittens's.

UpkeepUpdate frequency

76477 Complex Sound Synth ships an update every 3 months, Musical Kittens every 15 months. The most recent releases landed on November 1, 2026 and November 2, 2026 respectively.

Scorecard8 real differences · 2 level
76477 Complex Sound Synth versus Musical Kittens: the parameters behind the verdict, then further details
Parameter76477 Complex Sound SynthMusical Kittens
Price$2.99Free — better
Rating3.9 (9 ratings)4.3 (6 ratings) — better
Positive reviews50.0% of reviews100.0% of reviews — better
Number of ratings9 — better6
Update frequencyEvery 3 months — betterEvery 15 months
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationPaidFree with in-app purchases — better
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS12.0 — better17.6
Further details — not scored
Size4 MB14 MB
Age rating4+4+
DeveloperBlack Cat SystemsBrandon Stecklein

Customer experience

76477 Complex Sound Synth

All ratings10 ratings
Positive80.0%
Neutral0.0%
Negative20.0%
Written reviews10 reviews
Positive50.0%
Neutral30.0%
Negative20.0%

Musical Kittens

All ratings5 ratings
Positive80.0%
Neutral0.0%
Negative20.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

76477 Complex Sound Synth

No in-app purchases

1 purchases

Musical Kittens

One-time1
  • Advertising Removal$1.99

Questions

Is 76477 Complex Sound Synth free?
76477 Complex Sound Synth costs $2.99, with no in-app purchases.
Is Musical Kittens free?
Musical Kittens is free to download, with in-app purchases available.
Which has better reviews, 76477 Complex Sound Synth or Musical Kittens?
Musical Kittens is rated higher. 76477 Complex Sound Synth averages 3.9 out of 5 from 9 ratings, while Musical Kittens averages 4.3 from 6 ratings.
Do 76477 Complex Sound Synth or Musical Kittens have ads?
Musical Kittens shows ads; 76477 Complex Sound Synth does not.
Which is updated more often, 76477 Complex Sound Synth or Musical Kittens?
76477 Complex Sound Synth ships an update every 3 months, and Musical Kittens every 15 months. Most recently, 76477 Complex Sound Synth was updated on November 1, 2026 and Musical Kittens on November 2, 2026.

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