Comparison

76477 Complex Sound Synth vs Seyfert

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

Seyfert

This music effect plugin creates unique echoes that orbit and revolve around the listener. It offers advanced control over pitch, depth, and tone for each echo, with a built-in reverb and EQ for a rich soundscape. It functions as a standalone app or an Audio Unit for music production software.

Highlights
  • Orbital echo generation
  • Spin and Doppler pitch-bend effects
  • 3D binaural imaging
  • Octave shimmer and transpose
  • Per-echo tone and drive
  • Echo-focused reverb and EQ
  • Standalone and AUv3 support
Features
Read full description

Seyfert is a delay unlike your others: every echo spawns at its own place in an orbit around you, and the whole constellation slowly revolves. Turn up Feedback and you don't just add repeats, you spawn more echoes into the orbit, from a single tight slap to a dense, spiralling cloud. Spin revolves the whole field around you. Doppler bends the echoes in pitch as they whirl toward and away. 3D wraps them around your head on headphones. Lift the repeats an octave into crystalline shimmer, drop them a sub-octave for weight, or detune them into a chorus. A lush reverb blooms around the echoes, never the dry signal, so your source stays clear while the repeats dissolve into space. Features: - Orbital echoes, where Feedback sets how many circle you - Spin, from a gentle drift to a full whirl - Doppler pitch-bend as the orbit turns - 3D binaural imaging for headphones - Shimmer and transpose, up or down one octave (octaves, fifths, sub-octaves) - Per-echo Trail tone, tape Wobble, and Drive - Lush reverb applied to the echoes - Full 5-band EQ on the wet signal - Orbit and Ping-Pong patterns, tempo sync - 18 factory presets, plus save your own - Standalone app and Audio Unit (AUv3) for GarageBand, AUM, Logic, and more No accounts, no tracking, no data collected. Everything stays on your device.

Screenshots

76477 Complex Sound Synth4 screens
Seyfert3 screens

Verdict

The call

The clearest difference is review sentiment: Seyfert at 100% against 76477 Complex Sound Synth's 50%. Seyfert also leads on rating (5.0 vs 4.0) and update cadence (every 2 days vs every 3 months). 76477 Complex Sound Synth's advantage is ratings volume (10 vs 2) and iOS requirement (12.0 vs 15.0). On ads, in-app purchases, monetization model 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

76477 Complex Sound Synth costs $2.99 and Seyfert $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Seyfert holds the better App Store score, 5.0 against 4.0. That said, the two scores are not equally well evidenced: 76477 Complex Sound Synth has 10 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 50% of 76477 Complex Sound Synth's written reviews are positive against 100% of Seyfert's.

UpkeepUpdate frequency

76477 Complex Sound Synth ships an update every 3 months, Seyfert every 2 days. The most recent releases landed on October 4, 2026 and October 17, 2026 respectively.

Scorecard6 real differences · 4 level
76477 Complex Sound Synth versus Seyfert: the parameters behind the verdict, then further details
Parameter76477 Complex Sound SynthSeyfert
Price$2.99$1.99 — better
Rating4.0 (10 ratings)5.0 (2 ratings) — better
Positive reviews50.0% of reviews100.0% of reviews — better
Number of ratings10 — better2
Update frequencyEvery 3 monthsEvery 2 days — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS12.0 — better15.0
Further details — not scored
Size4 MB3 MB
Age rating4+4+
DeveloperBlack Cat SystemsKonstantin Torsten Schutz

Customer experience

76477 Complex Sound Synth

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

Seyfert

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

76477 Complex Sound Synth

No in-app purchases

None

Seyfert

No in-app purchases

Questions

Is 76477 Complex Sound Synth free?
76477 Complex Sound Synth costs $2.99, with no in-app purchases.
Is Seyfert free?
Seyfert costs $1.99, with no in-app purchases.
Which has better reviews, 76477 Complex Sound Synth or Seyfert?
Seyfert is rated higher. 76477 Complex Sound Synth averages 4.0 out of 5 from 10 ratings, while Seyfert averages 5.0 from 2 ratings.
Do 76477 Complex Sound Synth or Seyfert have ads?
Neither 76477 Complex Sound Synth nor Seyfert shows ads.
Which is updated more often, 76477 Complex Sound Synth or Seyfert?
76477 Complex Sound Synth ships an update every 3 months, and Seyfert every 2 days. Most recently, 76477 Complex Sound Synth was updated on October 4, 2026 and Seyfert on October 17, 2026.

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