# Mersenne vs Tera Pro

The clearest difference is in-app purchases: Mersenne at none against Tera Pro's 6. Mersenne also leads on review sentiment (88% vs 69%). Tera Pro's advantage is update cadence (every 5 days vs monthly) and ratings volume (154 vs 28). On rating, ads, device support and iOS requirement there is nothing between them.

Mersenne costs $8.00 and Tera Pro $6.99 up front. Tera Pro sells 6 one-off in-app purchases. Mersenne asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.7 for Mersenne against 4.6 for Tera Pro. That said, the two scores are not equally well evidenced: Tera Pro has 154 ratings behind it against 28, so its average is the more settled of the two. Written reviews are what separate them: 88% of Mersenne's written reviews are positive against 69% of Tera Pro's.

Mersenne ships an update monthly, Tera Pro every 5 days. The most recent releases landed on October 24, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Mersenne | Tera Pro |
| --- | --- | --- |
| Price | $8.00 | **$6.99** |
| Rating | **[4.7 (28 ratings)](https://appshunter.io/ios/app/mersenne-auv3-plug-in-synth/id1084197093/reviews)** | [4.6 (154 ratings)](https://appshunter.io/ios/app/tera-pro/id1578464219/reviews) |
| Number of ratings | 28 | **154** |
| Positive reviews | **87.5% of reviews** | 69.4% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 5 days** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 11 MB | 306 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [iceWorks, Inc.](https://appshunter.io/developer/347507439) | [Harry Gohs](https://appshunter.io/developer/382428644) |

## What reviewers say

### Mersenne

[App page](https://appshunter.io/ios/app/mersenne-auv3-plug-in-synth/id1084197093)

This app is an AUv3-compatible synthesizer designed to create bell-like metallic sounds. It combines FM synthesis, a noise generator, and a resonator for crafting clear tones and complex metallic textures.

**Highlights:** AUv3-compatible synthesizer, Dual FM synthesis modules, Noise generator, Resonator, Metallic sound design, Bell-like tones

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

**In-app purchases:** none


### Tera Pro

[App page](https://appshunter.io/ios/app/tera-pro/id1578464219)

Explore a vast array of sound synthesis methods, from analog emulations to modern digital techniques. Combine modules for unique sonic textures, enhanced by an intelligent interface and realtime visual feedback. Expand your sound palette with additional modules available through in-app purchases.

**Highlights:** Multiple synthesis methods (analog, FM, spectral, additive), Physical modeling and wave shaping, Intelligent user interface with realtime scopes, Flexible module routing, 128-voice polyphony with vintage voice modeling, Seamless sound switching, Extensive preset library

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

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Library WaveShaper | $0.99 | one-time |
| Module Waves | $5.99 | one-time |
| FM 7 module | $5.99 | one-time |
| Module RingZ | $5.99 | one-time |
| Module BrainZ | $6.99 | one-time |
| Module CloudZ | $9.99 | one-time |

**What reviewers like**

- 🎵 Exceptional sound quality and versatile synthesis capabilities
- 💡 Innovative modular workflow with flexible architecture
- 🎛️ Extensive preset library (1000+ presets)
- 🔧 Powerful sound design tools with multiple synthesis types
- 📱 Available on both iOS and macOS (M1)

**What reviewers complain about**

- 🎮 Steep learning curve and complex UI
- ⌨️ Unconventional on-screen keyboard design
- 🐛 Frequent crashes and stability issues
- 🔊 Dangerously loud output without limiter
- ⚙️ UI elements sometimes unresponsive or laggy

**Reported bugs**

- App crashes on macOS and iOS
- Piano keyboard not appearing
- Wavetable module IAP producing no sound
- In-app purchases disappearing or not activating
- Presets causing white noise or feedback blasts

**Requested features**

- Undo/Redo functionality
- MIDI Panic button (prominent placement)
- Output limiter for safety
- Standard black and white keyboard option
- Favorites/bookmarking system for presets


## Frequently asked questions

### Is Mersenne free?

Mersenne costs $8.00, with no in-app purchases.

### Is Tera Pro free?

Tera Pro costs $6.99, and also offers in-app purchases.

### Which has better reviews, Mersenne or Tera Pro?

Mersenne is rated higher. Mersenne averages 4.7 out of 5 from 28 ratings, while Tera Pro averages 4.6 from 154 ratings.

### Do Mersenne or Tera Pro have ads?

Neither Mersenne nor Tera Pro shows ads.

### Which is updated more often, Mersenne or Tera Pro?

Mersenne ships an update monthly, and Tera Pro every 5 days. Most recently, Mersenne was updated on October 24, 2026 and Tera Pro on October 30, 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.*