# shapesynth vs K7D

The clearest difference is rating: shapesynth at 4.9 against K7D's 4.6. shapesynth also leads on iOS requirement (9.0 vs 17.0). K7D's advantage is review sentiment (80% vs 65%) and ratings volume (79 vs 24). On update cadence, ads, in-app purchases and monetization model there is nothing between them.

shapesynth costs $4.99 and K7D $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

shapesynth holds the better App Store score, 4.9 against 4.6. Both are backed by a comparable volume of ratings — 24 and 79 respectively. Written reviews complicate that: 65% of shapesynth's written reviews are positive against 80% of K7D's, so the app with the better star average is not the one people write more warmly about.

shapesynth ships an update every 2 months, K7D every 3 months. The most recent releases landed on September 25, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | shapesynth | K7D |
| --- | --- | --- |
| Price | $4.99 | **$3.99** |
| Rating | **[4.9 (24 ratings)](https://appshunter.io/ios/app/shapesynth/id431097161/reviews)** | [4.6 (79 ratings)](https://appshunter.io/ios/app/k7d-tape-delay/id1460245991/reviews) |
| Number of ratings | 24 | **79** |
| Positive reviews | 65.0% of reviews | **79.5% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 3 months |
| Monetization | Paid | Paid |
| Size | 8 MB | 113 MB |
| Requires iOS | **9.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Erik Sigth](https://appshunter.io/developer/385275335) | [Imaginando Lda](https://appshunter.io/developer/895445015) |

## What reviewers say

### shapesynth

[App page](https://appshunter.io/ios/app/shapesynth/id431097161)

Create unique retro-inspired sounds by drawing oscillator waveforms. This polyphonic synthesizer offers extensive modulation options, built-in effects, and recording capabilities. Seamlessly integrate with other music apps and hardware for a versatile creative experience.

**Highlights:** Draw custom oscillator waveforms, 16-voice polyphony, Arpeggiator and stereo delay, Resonant filter, Parameter modulation via keyboard, MPE, accelerometer, Tape recorder with infinite overdubs, Inter-app audio and AUv3 support

**Features:** Vision Pro support

**In-app purchases:** none


### K7D

[App page](https://appshunter.io/ios/app/k7d-tape-delay/id1460245991)

This app offers a vintage tape delay effect with analog emulation and modern controls. It recreates classic hardware echo machines for a warm, characterful sound. Use it standalone or as an AUv3 plugin in iOS DAWs.

**Highlights:** Analog modeled dual playhead delay, Modeled microphone input with saturation, Normal and Ping Pong modes, High pass and Low pass feedback filters, Powerful LFO time modulation, BPM syncable delay time, MIDI delay time modulation

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is shapesynth free?

shapesynth costs $4.99, with no in-app purchases.

### Is K7D free?

K7D costs $3.99, with no in-app purchases.

### Which has better reviews, shapesynth or K7D?

shapesynth is rated higher. shapesynth averages 4.9 out of 5 from 24 ratings, while K7D averages 4.6 from 79 ratings.

### Do shapesynth or K7D have ads?

Neither shapesynth nor K7D shows ads.

### Which is updated more often, shapesynth or K7D?

shapesynth ships an update every 2 months, and K7D every 3 months. Most recently, shapesynth was updated on September 25, 2026 and K7D on September 22, 2026.

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