# Rithmatic vs Contour

The clearest difference is review sentiment: Rithmatic at 67% against Contour's 0%. Rithmatic also leads on rating (4.6 vs 4.0) and monetization model (free vs freemium). On price, ads, in-app purchases and iOS requirement there is nothing between them.

Both are free to download. Rithmatic sells 4 one-off in-app purchases and Contour sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Rithmatic holds the better App Store score, 4.6 against 4.0. Both are backed by a comparable volume of ratings — 9 and 2 respectively. Written reviews point the same way: 67% of Rithmatic's written reviews are positive against 0% of Contour's.

Rithmatic ships an update every 2 days, Contour weekly. The most recent releases landed on October 29, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Rithmatic | Contour |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (9 ratings)](https://appshunter.io/ios/app/rithmatic-fm-synth/id6794107110/reviews)** | [4.0 (2 ratings)](https://appshunter.io/ios/app/contour-ambient-morph-synth/id6798038727/reviews) |
| Number of ratings | **9** | 2 |
| Positive reviews | **66.7% of reviews** | 0.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 2 days** | Weekly |
| Monetization | **Free** | Freemium |
| Size | 61 MB | 108 MB |
| Requires iOS | **15.0** | 16.0 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [MADE WITH BEST PRACTICE LLC](https://appshunter.io/developer/6779338119) | [Chih Han Lin](https://appshunter.io/developer/1800248325) |

## What reviewers say

### Rithmatic

[App page](https://appshunter.io/ios/app/rithmatic-fm-synth/id6794107110)

This app is an FM synthesizer featuring a vast library of classic voices. It allows users to explore, learn, build, and blend sounds using an intuitive interface and an AUv3 plugin for DAWs. It offers a comprehensive synthesis engine and various playback options.

**Highlights:** 36,118 classic DX7 voices included, AUv3 plugin for DAWs, Patch Builder to learn FM synthesis, Sound blending feature, On-screen and MIDI keyboard support, Arpeggiator and latch function, WAV export

**Features:** Vision Pro support, iPhone Duo support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Comrade! | $4.99 | one-time |
| Major Supporter | $9.99 | one-time |
| Supporting Member | $19.99 | one-time |
| Underwriter | $49.99 | one-time |


### Contour

[App page](https://appshunter.io/ios/app/contour-ambient-morph-synth/id6798038727)

This app is a unique musical instrument played by touch. It uses a visual interface where your finger's position determines the sound, offering a novel way to create drones, textures, and pads. It also functions as an AUv3 plugin for use in other music production apps.

**Highlights:** Touch-based sound generation, Perceptual distance mapping, Eleven distinct sound sheets, MIDI input and ribbon controller, AUv3 plugin support, Recording functionality (Pro), Customizable sound sheets (Pro)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Contour Pro | $3.99 | one-time |


## Frequently asked questions

### Is Rithmatic free?

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

### Is Contour free?

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

### Which has better reviews, Rithmatic or Contour?

Rithmatic is rated higher. Rithmatic averages 4.6 out of 5 from 9 ratings, while Contour averages 4.0 from 2 ratings.

### Do Rithmatic or Contour have ads?

Neither Rithmatic nor Contour shows ads.

### Which is updated more often, Rithmatic or Contour?

Rithmatic ships an update every 2 days, and Contour weekly. Most recently, Rithmatic was updated on October 29, 2026 and Contour on October 25, 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.*