# ButterSynth vs Tera Pro

The clearest difference is price: Tera Pro at $6.99 against ButterSynth's $19.99. Tera Pro also leads on rating (4.6 vs 4.0) and update cadence (every 5 days vs every 2 months). ButterSynth's advantage is in-app purchases (none vs 6) and chart position (#190 vs unranked). On ratings volume, ads and device support there is nothing between them.

ButterSynth costs $19.99 and Tera Pro $6.99 up front. Tera Pro sells 6 one-off in-app purchases. ButterSynth asks for nothing beyond the download.

Tera Pro holds the better App Store score, 4.6 against 4.0. Both are backed by a comparable volume of ratings — 62 and 155 respectively. Written reviews point the same way: 60% of ButterSynth's written reviews are positive against 69% of Tera Pro's.

ButterSynth ships an update every 2 months, Tera Pro every 5 days. The most recent releases landed on September 16, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | ButterSynth | Tera Pro |
| --- | --- | --- |
| Price | $19.99 | **$6.99** |
| Rating | [4.0 (62 ratings)](https://appshunter.io/ios/app/buttersynth/id1497419006/reviews) | **[4.6 (155 ratings)](https://appshunter.io/ios/app/tera-pro/id1578464219/reviews)** |
| Number of ratings | 62 | **155** |
| Positive reviews | 59.6% of reviews | **69.4% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 5 days** |
| Monetization | Paid | **Free with in-app purchases** |
| Best chart rank | **#190** | — |
| Size | 468 MB | 306 MB |
| Requires iOS | 14.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Arto Vaarala](https://appshunter.io/developer/890886114) | [Harry Gohs](https://appshunter.io/developer/382428644) |

## What reviewers say

### ButterSynth

[App page](https://appshunter.io/ios/app/buttersynth/id1497419006)

**Currently charting:** #190 Top Paid · Music (US App Store)

This powerful synthesizer app offers a hybrid approach, combining wavetable, FM, and sample-based synthesis. Create unique sounds with a vast sonic range, advanced modulation, and a built-in effects rack. It caters to both experienced sound designers and beginners with extensive presets.

**Highlights:** Hybrid 6-oscillator synthesis (wavetable, FM, sample), Built-in wavetable editor, FM engine with 4 operators, Sample and Granulator engines, 32-slot modulation matrix, Internal FX rack with 16 modules, Extensive preset library

**Features:** Vision Pro support

**In-app purchases:** none

**What reviewers like**

- ✨ Deep sound design capabilities
- 🎛️ Versatile modulation matrix
- 🔊 Great sound quality
- 💡 Innovative wavetable generator
- 🌟 Serum-like experience

**What reviewers complain about**

- 📱 Fiddly on small screens
- 🐛 Crashes frequently
- 🐛 Disappears in Cubasis
- 🐛 Spikes CPU usage
- 🐛 Crashes on patch change

**Reported bugs**

- App crashing with AUM
- Disappears in Cubasis randomly
- Crashes all the time inside Logic
- Changing a patch spikes CPU to 99%
- Crashes on every patch change

**Requested features**

- MPE popup possible on top of the auv3
- Button to hide built-in keyboard
- Buffer size option
- Additional MIDI mappings (e.g., arpeggiator toggle)
- Sustain pedal support


### 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 ButterSynth free?

ButterSynth costs $19.99, with no in-app purchases.

### Is Tera Pro free?

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

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

Tera Pro is rated higher. ButterSynth averages 4.0 out of 5 from 62 ratings, while Tera Pro averages 4.6 from 155 ratings.

### Do ButterSynth or Tera Pro have ads?

Neither ButterSynth nor Tera Pro shows ads.

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

ButterSynth ships an update every 2 months, and Tera Pro every 5 days. Most recently, ButterSynth was updated on September 16, 2026 and Tera Pro on September 20, 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.*