# Motion Synth vs Viking Synth

The clearest difference is price: Motion Synth at Free against Viking Synth's $3.99. Motion Synth also leads on iOS requirement (9.0 vs 12.0). Viking Synth's advantage is rating (4.7 vs 3.5). On review sentiment, ratings volume, update cadence and ads there is nothing between them.

Motion Synth is free to download; Viking Synth costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Viking Synth holds the better App Store score, 4.7 against 3.5. Both are backed by a comparable volume of ratings — 40 and 42 respectively. Written reviews complicate that: 73% of Motion Synth's written reviews are positive against 69% of Viking Synth's, so the app with the better star average is not the one people write more warmly about.

Both ship on a similar rhythm, roughly every 4 months. The most recent releases landed on June 11, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | Motion Synth | Viking Synth |
| --- | --- | --- |
| Price | **Free** | $3.99 |
| Rating | [3.5 (40 ratings)](https://appshunter.io/ios/app/motion-synth/id945266624/reviews) | **[4.7 (42 ratings)](https://appshunter.io/ios/app/viking-synth/id1085274012/reviews)** |
| Number of ratings | 40 | **42** |
| Positive reviews | **73.3% of reviews** | 69.4% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | Every 4 months |
| Monetization | **Free** | Paid |
| Size | 48 MB | 11 MB |
| Requires iOS | **9.0** | 12.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [AUUG](https://appshunter.io/developer/945266623) | [Blamsoft, Inc.](https://appshunter.io/developer/1051938244) |

## What reviewers say

### Motion Synth

[App page](https://appshunter.io/ios/app/motion-synth/id945266624)

This app turns your iPhone or iPod touch into a musical instrument. Play notes with touch and control sound with motion. It can be used standalone, with other iOS music apps, or even external hardware and laptop software.

**Highlights:** Play notes via touch, Shape sound through motion, Control in-app sounds, Control other iOS music apps, Control external hardware synths, Control laptop audio/visual software

**Features:** macOS Compatibility

**In-app purchases:** none


### Viking Synth

[App page](https://appshunter.io/ios/app/viking-synth/id1085274012)

This app emulates a classic monophonic analog synthesizer with advanced DSP technology. It features three variable wave oscillators, dual ladder filters, an LFO, and two modulation busses for versatile sound design.  An intuitive interface and extensive preset library make it ideal for creating thick bass and rich lead sounds.

**Highlights:** Three continuously variable wave oscillators, Dual ladder filters (Lowpass/Highpass), Multi-wave LFO, Two modulation busses, Intuitive user interface with expandable controls, 228 presets including Bass, Lead, and Synthwave, State-of-the-art DSP for authentic sound

**In-app purchases:** none

**What reviewers like**

- 🎶 Great sound quality
- 💡 Versatile sound options
- 💰 Excellent value (free)
- 💻 Lightweight and efficient
- 🎹 Good for learning synthesis

**What reviewers complain about**

- ❓ Preset issues
- 🔌 Not a standalone app
- 🐛 Occasional crashes
- 💾 Settings not saving
- 🤷‍♂️ Difficult to find/use

**Reported bugs**

- Presets not showing up
- Presets disappear
- App not showing in AUv3 menu
- Settings not saving after iOS 14 update
- Crashes when opening presets browser

**Requested features**

- More subtle drive mode
- Categorized preset browser
- Polyphony option
- Dark mode
- More apps from developer


## Frequently asked questions

### Is Motion Synth free?

Motion Synth is free to download, with no in-app purchases.

### Is Viking Synth free?

Viking Synth costs $3.99, with no in-app purchases.

### Which has better reviews, Motion Synth or Viking Synth?

Viking Synth is rated higher. Motion Synth averages 3.5 out of 5 from 40 ratings, while Viking Synth averages 4.7 from 42 ratings.

### Do Motion Synth or Viking Synth have ads?

Neither Motion Synth nor Viking Synth shows ads.

### Which is updated more often, Motion Synth or Viking Synth?

Motion Synth ships an update every 4 months, and Viking Synth every 4 months. Most recently, Motion Synth was updated on June 11, 2026 and Viking Synth on September 23, 2026.

---

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