Crystal Synth 4+

Green Oak Software

Designed for iPad

    • 5.0 • 1 Rating
    • $0.99



Crystal is a full featured semi-modular synthesizer, ideally suited to creating lush evolving soundscapes. Long a popular synthesizer on the desktop, it is now available for the iPad and iPhone.

For videos and information about Crystal, visit:

== Features ==
Browse through the included sounds and use the 2 octave keypad 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 tweakers 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/lforates/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.

== Different Versions ==
There are two different versions of Crystal to choose from, Crystal and Crystal XT, so you can select the one that is best for you. Crystal is the basic version. With this version you can browse sounds, play notes, and create new sounds, taking advantage of its powerful semimodular synthesis engine.

Crystal XT (also available in the app store from Green Oak Software) adds MIDI keyboard input, sharing of sounds with the desktop version and other audio apps, and background audio so you can play Crystal from midi controller apps.

== Notes ==
Important note for iPhone users: Crystal 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. But on the iPhone you can still browse sounds, play notes from the keypad, and create new sounds with the Breed and Design features.

What’s New

Version 2.1.8

This app has been updated by Apple to display the Apple Watch app icon.

Fix for locked screen orientation bug.

Ratings and Reviews

5.0 out of 5
1 Rating

1 Rating

SF musician ,

Mature synth, lots of features; three voices; works great!

Musicians take note: Crystal has been a mainstay of the VST synth world for several years, and it has been regularly updated as time goes by. On the iPad it is a stand-alone synth (not a plugin) has a broad range of features: modulation matrix, six LFOs, three voices (each with its own filter and amplitude envelope). This iPad version makes good use of finger gestures, for example, on the envelope drawing pictures. It comes pre-loaded with quite a few patches. A fun feature is the "Breed" button which generates a random patch.

trouble with tribbles ,

Great sounding synth!

I've been a regular user of the desktop/plugin synth "Crystal" for many years. It's great to finally have it on the iPad for mobile play and tweaking. This is a worthy v1.0, and I'm sure Green Oak will be improving on it over time, as they always have.

The keypad is a cool way to trigger notes, although a tad limiting. This version of the synth is monophonic (unlike the desktop version), so no chording, but the sounds are so fat one hardly notices. Still, I'm looking forward to the XT version, since being able to play Crystal Synth using an outboard keyboard controller is an awesome prospect! I also have tons of patches to pull in from the desktop version...

This version has the complete range of parameters for sound design, and I'll be happily tweaking (the "Breed" function is very cool!) until the XT version arrives. In any case, it's an amazing value for 99 cents!

Lawrence Mitchell ,


This has the same great sounds as the Desktop plug in and the Ipad app. I love using it and making up great sound textures. Great for song intros and bridges and endings. Mood setting sounds! Great
I'm very happy that Crystal is now on a mobile platform.

App Privacy

The developer, Green Oak Software, has not provided details about its privacy practices and handling of data to Apple.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


  • Family Sharing

    Up to six family members can use this app with Family Sharing enabled.

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