# Arc & Decay vs Rithmatic

The clearest difference is in-app purchases: Arc & Decay at none against Rithmatic's 4. Arc & Decay also leads on update cadence (daily vs every 2 days). Rithmatic's advantage is device support (4 vs 2) and iOS requirement (15.0 vs 17.6). On price and ads there is nothing between them.

Both are free to download. Rithmatic sells 4 one-off in-app purchases. Arc & Decay asks for nothing beyond the download.

Arc & Decay ships an update daily, Rithmatic every 2 days. The most recent releases landed on October 25, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | Arc & Decay | Rithmatic |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.6 (9 ratings)](https://appshunter.io/ios/app/rithmatic-fm-synth/id6794107110/reviews)** |
| Number of ratings | — | **9** |
| Positive reviews | — | 66.7% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Daily** | Every 2 days |
| Monetization | — | Free |
| Size | 11 MB | 61 MB |
| Requires iOS | 17.6 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Tash Baycroft](https://appshunter.io/developer/6779379023) | [MADE WITH BEST PRACTICE LLC](https://appshunter.io/developer/6779338119) |

## What reviewers say

### Arc & Decay

[App page](https://appshunter.io/ios/app/arc-and-decay/id6779379021)

**Features:** macOS Compatibility

**In-app purchases:** none


### Rithmatic

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

This app is an FM synthesizer with a vast library of classic voices. It allows users to explore, learn, build, and blend sounds, and can be used as a standalone instrument or an AUv3 plugin within DAWs. It offers a visual representation of sound and a patch builder for understanding FM synthesis.

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

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Small Tip | $4.99 | one-time |
| Medium Tip | $9.99 | one-time |
| Large Tip | $19.99 | one-time |
| Extra Large Tip | $49.99 | one-time |


## Frequently asked questions

### Is Arc & Decay free?

Arc & Decay is free to download, with no in-app purchases.

### Is Rithmatic free?

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

### Do Arc & Decay or Rithmatic have ads?

Neither Arc & Decay nor Rithmatic shows ads.

### Which is updated more often, Arc & Decay or Rithmatic?

Arc & Decay ships an update daily, and Rithmatic every 2 days. Most recently, Arc & Decay was updated on October 25, 2026 and Rithmatic on November 6, 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.*