# Poseidon Synth vs KeepTrack

The clearest difference is price: KeepTrack at Free against Poseidon Synth's $7.99. Poseidon Synth's advantage is in-app purchases (none vs 3) and iOS requirement (12.0 vs 26.0). On update cadence, ads and device support there is nothing between them.

KeepTrack is free to download; Poseidon Synth costs $7.99 up front. KeepTrack sells 3 in-app purchases, starting at $0.99 per month. Poseidon Synth asks for nothing beyond the download.

Poseidon Synth ships an update every 4 months, KeepTrack every 2 months. Both last shipped on October 24, 2026.

## The numbers

| Metric | Poseidon Synth | KeepTrack |
| --- | --- | --- |
| Price | $7.99 | **Free** |
| Rating | **[4.0 (33 ratings)](https://appshunter.io/ios/app/poseidon-synth/id1045058006/reviews)** | — |
| Number of ratings | **33** | — |
| Positive reviews | 58.8% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 2 months** |
| Monetization | Paid | — |
| Size | 328 MB | 16 MB |
| Requires iOS | **12.0** | 26.0 |
| Devices | iPad | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Harry Gohs](https://appshunter.io/developer/382428644) | [Jonas Karl Zimmermann](https://appshunter.io/developer/1890587051) |

## What reviewers say

### Poseidon Synth

[App page](https://appshunter.io/ios/app/poseidon-synth/id1045058006)

Explore vast sonic landscapes with this advanced synthesizer. It combines analog synthesis with spectral modeling for unique sound design, offering powerful filters, spatialization, and a vast library of presets and sound models.

**Highlights:** Spectral model oscillator, F-Domain Filter with variable slope, Spatializer for stereo movement, Extensive sound browser, Arpeggiator with programmable sequences, Built-in effects suite

**In-app purchases:** none


### KeepTrack

[App page](https://appshunter.io/ios/app/keeptrack-musical-journey/id6769327729)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Premium | $0.99 | per month |
| Yearly Premium | $8.99 | per year |
| Lifetime Premium | $17.99 | one-time |


## Frequently asked questions

### Is Poseidon Synth free?

Poseidon Synth costs $7.99, with no in-app purchases.

### Is KeepTrack free?

KeepTrack is free to download, with in-app purchases available.

### Do Poseidon Synth or KeepTrack have ads?

Neither Poseidon Synth nor KeepTrack shows ads.

### Which is updated more often, Poseidon Synth or KeepTrack?

Poseidon Synth ships an update every 4 months, and KeepTrack every 2 months. Most recently, Poseidon Synth was updated on October 24, 2026 and KeepTrack on October 24, 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.*