Crystal Synth XT vs Cube Synth
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Crystal Synth XT
Create lush, evolving soundscapes with a powerful semi-modular synthesizer for mobile devices. Explore subtractive and FM synthesis, extensive modulation, and built-in effects. Share sounds with the desktop version and connect MIDI keyboards for a full hardware synth experience.
- Semi-modular synthesis engine
- Subtractive and FM synthesis
- Extensive modulation control (>90 parameters)
- Multi-stage envelopes with graphical editors
- Tempo-synced envelopes, LFOs, and delays
- Built-in effects (chorus, flanger, echo)
- MIDI keyboard input and virtual MIDI support
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Crystal Synth XT is a full featured semi-modular synthesizer, ideally suited to creating lush evolving soundscapes. Crystal VST has long been a popular synthesizer on the desktop. Crystal Synth XT brings that same powerful synthesis engine to the iPad and iPhone. Crystal Synth XT features MIDI keyboard input via Apple's camera adapter and sharing of sounds with the desktop version of Crystal. == Features == Browse through the included sounds and use the 2 octave keypad or keyboard to trigger notes to produce evolving, rhythmic, or melodic sounds. Create your own sounds with a single button press using the breed feature. When using an iPad, you can delve into a tweaker's dream by using the extensive editing features to sculpt sounds to your heart's content (editing features are only available when used on an iPad). Crystal features both subtractive synthesis and frequency modulation (FM) synthesis. It offers abundant modulation control with over 90 parameters which may be modulated, multi-stage envelopes with graphical editors, extensive tempo sync of envelopes/lfo rates/delay times, built-in effects for chorus/flanging/comb filtering/echoes, and a band splitter for effects processing by frequency band. Not only that, Crystal has wave sequencing and granular synthesis. The musical applications for Crystal are literally boundless. == MIDI == With MIDI keyboard input, you can connect a MIDI keyboard to your iPad or iPhone and play Crystal Synth XT like a hardware synth. == Virtual MIDI == Use virtual midi to play Crystal Synth XT from a midi controller app. Use the Settings app to turn on the Background Audio mode to enable Crystal to play audio when in the background. You can then play Crystal from a midi controller app which supports virtual midi. == Sharing == With patch sharing you can create sounds on your iPad or iPhone while away from the studio, then transfer them to the desktop Crystal when you get back to the studio to use in recording projects. Or, create banks of sounds on the desktop Crystal, then transfer them to the iPad/iPhone Crystal to use in a live performance for a truly portable rig. Use Audio copy/paste to record your performance on Crystal and transfer that performance to another app. Or copy your recorded performance to your computer. == Inter App Audio and Audiobus == To use IAA or Audiobus to record into other apps, turn on Background Audio for Crystal Synth XT in the Settings app. See demonstration videos on the greenoak.com website. == Different Versions == If you don't need all the features of Crystal Synth XT, try the basic version of Crystal, also available in the app store from Green Oak Software. With the basic version you can browse sounds, play notes, and create new sounds, taking advantage of its powerful semimodular synthesis engine. The XT version adds features like MIDI keyboard input via the iPad's camera adapter, IAA/Audiobus, and patch sharing with the desktop version. Choose the app that is best for you! == Notes == Important note for iPhone users: Crystal Synth XT runs on both the iPad and the iPhone. Because of the limited screen space on the iPhone however, the editing pages, which contain the edit controls, are not available when running on that device. However, on the iPhone you can still browse sounds, play notes from the keypad, create new sounds with the Breed feature, modify patches with the Design feature, and share sounds with desktop Crystal VST. For videos and information about Crystal Synth XT, visit: http://www.greenoak.com
Cube Synth
Explore additive synthesis with intuitive sound morphing and deep parameter control. Create complex soundscapes, vocal phrases, or rhythms with ease. Offers a unique randomizer for instant patch generation.
- Additive synthesis engine
- Intelligent sound morphing
- Over 400 sound presets
- Programmable arpeggiator
- Multiple built-in effects
- Audiobus and Inter-app audio support
- Random sound patch generator
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Cube Synth is a groundbreaking new software instrument giving you the power and flexibility of additive synthesis together with easy editing and morphing capabilities. Macro parameters allow you to control this beast with unequalled ease. Intelligent sound morphing capabilities enables you to easily create complex evolving sound scapes, vocal phrases or stunning rhythms simply by choosing up to four sound sources from a predefined set. Then add one of the predefined envelopes and a unique, complex sound preset containing thousands of parameters is created! If you want to dive deeper into the inner secrets of this synthesis monster you can manipulate each parameter individually to get precise control over the sound. A number of high level parameters such as Brightness and Harmonic spread control hundreds of synthesis parameters in a way modeled after the inner workings of natural instruments. Cube Synth gives you also a new method of getting randomly generated sound patches in a way you never experienced before: roll the dice! Every single try gives you a new unique sound patch, really every try, promised… Synthesis • over 400 sound presets • four morphable sound sources • up to 512 partials per voice • harmonic/inharmonic spectra • arbitrary noise spectra • morphable filter banks • 3 Envelopes with tempo sync • 64 time/level segments per envelope Arpeggiator • Uses programmable sequences with up to 32 steps. • Can trigger single notes and chords. • Unique randomizer generates Arpeggios with 100% usability. • 32 Arpeggios included, unlimited useer arpeggios possible. • For each step you can program tie, accent, transposition and note order Effects • Chorus • Phaser • Overdrive • Ensemble • Echo/Delay • Reverb Global • Audiobus 2 compatible (Input slot) with state saving • Support for Ableton Link. • Inter-app audio compatible (Instrument/Generator) • CoreMIDI / Virtual MIDI • Audio recorder with Metronome. • Upload to SoundCloud and File Export. • Audio pasteboard.
Screenshots
Verdict
The clearest difference is rating: Crystal Synth XT at 4.9 against Cube Synth's 4.7. Crystal Synth XT also leads on device support (3 vs 1). Cube Synth's advantage is price ($1.99 vs $4.99) and review sentiment (89% vs 78%). On ratings volume, update cadence, ads and in-app purchases there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Crystal Synth XT costs $4.99 and Cube Synth $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Crystal Synth XT holds the better App Store score, 4.9 against 4.7. Both are backed by a comparable volume of ratings — 20 and 16 respectively. Written reviews complicate that: 78% of Crystal Synth XT's written reviews are positive against 89% of Cube 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 September 21, 2026 and August 9, 2026 respectively.
| Parameter | Crystal Synth XT | Cube Synth |
|---|---|---|
| Price | $4.99 | $1.99 — better |
| Rating | 4.9 (20 ratings) — better | 4.7 (16 ratings) |
| Positive reviews | 78.4% of reviews | 89.5% of reviews — better |
| Number of ratings | 20 — better | 16 |
| Update frequency | Every 4 months | Every 4 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod — better | iPad |
| Requires iOS | 11.0 — better | 12.0 |
| Further details — not scored | ||
| Size | 36 MB | 19 MB |
| Age rating | 4+ | 4+ |
| Developer | Green Oak Software | Harry Gohs |
Customer experience
Crystal Synth XT
Cube Synth
Bugs and requests
Crystal Synth XT
Reported bugs
15 issues- App not working, splash screen disappears
- Screen in background
- Envelope points not moving
- Breed fan not working properly
- Crashing on launch
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- Clicks and crashes when adjusting parameters
- Sounds distorted and buggy
- Won't play any sounds
- Crashes when hitting record
- Play surface stopped responding
- Crash when trying record function
- Crackles and pops in sound engine
- Audiobus fails, breaks up when switching apps
- Preset name editing gone after iOS 7 update
- Splash screen appears for a second, then disappears
Requested features
22 requests- AUv3 support
- Update to an AU3 standard
- Newer interface
- Fix breed fan access to all presets
- Fix preset system variations between devices
Show 17 moreShow fewer
- AUv3 implementation
- Update the envelope points
- AUv3 standard transformation
- Multiple instances in DAWs
- Dark mode option
- Advanced analytics dashboard
- Fix preset name editing
- In-app purchase for a second instance
- Load/Save banks
- Metronome or timer capability
- Newer app icon
- Redesign for Retina Display
- Polyphony on iOS version
- Recording facility
- Keyboard option
- Virtual MIDI support
- Advanced patch editing on iPod version
Cube Synth
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Crystal Synth XT
No in-app purchases
Cube Synth
No in-app purchases








