# CZ App for iPad vs ButterSynth

The clearest difference is review sentiment: ButterSynth at 59% against CZ App for iPad's 35%. ButterSynth also leads on rating (4.0 vs 3.8) and ratings volume (63 vs 8). CZ App for iPad's advantage is price ($14.99 vs $19.99) and iOS requirement (8.0 vs 14.0). On update cadence, ads, in-app purchases and monetization model there is nothing between them.

CZ App for iPad costs $14.99 and ButterSynth $19.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ButterSynth holds the better App Store score, 4.0 against 3.8. That said, the two scores are not equally well evidenced: ButterSynth has 63 ratings behind it against 8, so its average is the more settled of the two. Written reviews point the same way: 35% of CZ App for iPad's written reviews are positive against 59% of ButterSynth's.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on November 5, 2026 and November 11, 2026 respectively.

## The numbers

| Metric | CZ App for iPad | ButterSynth |
| --- | --- | --- |
| Price | **$14.99** | $19.99 |
| Rating | [3.8 (8 ratings)](https://appshunter.io/ios/app/cz-app-for-ipad/id954171519/reviews) | **[4.0 (63 ratings)](https://appshunter.io/ios/app/buttersynth/id1497419006/reviews)** |
| Number of ratings | 8 | **63** |
| Positive reviews | 34.8% of reviews | **59.2% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | Paid | Paid |
| Size | 33 MB | 468 MB |
| Requires iOS | **8.0** | 14.0 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [CASIO COMPUTER CO., LTD.](https://appshunter.io/developer/456569836) | [Arto Vaarala](https://appshunter.io/developer/890886114) |

## What reviewers say

### CZ App for iPad

[App page](https://appshunter.io/ios/app/cz-app-for-ipad/id954171519)

This music app recreates the functionality of classic Casio CZ-series synthesizers, offering a 4-part PD sound source with 36 waveforms for diverse sound creation. It allows users to play along with audio files, utilize multi-play modes for collaborative performance, and connect with external MIDI instruments.

**Highlights:** Phase Distortion (PD) sound source, 36 waveforms for diverse sounds, Play along to audio files, Multi-play mode for collaborative performance, External MIDI instrument support, Inter-App Audio and Audiobus compatibility

**In-app purchases:** none


### ButterSynth

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

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


## Frequently asked questions

### Is CZ App for iPad free?

CZ App for iPad costs $14.99, with no in-app purchases.

### Is ButterSynth free?

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

### Which has better reviews, CZ App for iPad or ButterSynth?

ButterSynth is rated higher. CZ App for iPad averages 3.8 out of 5 from 8 ratings, while ButterSynth averages 4.0 from 63 ratings.

### Do CZ App for iPad or ButterSynth have ads?

Neither CZ App for iPad nor ButterSynth shows ads.

### Which is updated more often, CZ App for iPad or ButterSynth?

CZ App for iPad ships an update every 2 months, and ButterSynth every 2 months. Most recently, CZ App for iPad was updated on November 5, 2026 and ButterSynth on November 11, 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.*