Cruz GR vs The Keystone
Price, ratings, monetisation and update history for both apps, side by side β with what reviewers say about each.
Cruz GR
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Cruz GR turns your iPhone and iPad into a powerful MIDI controller. Create custom pad layouts in seconds. Build rich chords in any key and adapt every grid to your workflow. Three modes: Notes: Play melodies, basslines, leads, and trigger samples. Chords: Generate musical voicings from simple triads to rich 11ths, voiced Compact, Open or Wide, across any scale and key. Control: Map pads to MIDI CC. Pair instantly with Cruz GR Connect, the Mac companion app. Stable, persistent connectivity over Wi-Fi or USB with support for multiple devices. Cruz GR Connect is included with your purchase and available on the Mac App Store. Designed for music production on Mac. Works with Logic Pro, Ableton Live, FL Studio, and other major DAWs on Mac. Cruz GR is a MIDI controller and does not generate sound on its own. For live performance and studio recording, a USB connection is recommended.
The Keystone
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The Keystone dials in the sound and spirit of the early-β70s Bay Area club scene to your iPhone and iPad. More than half a century later, that music is still being playedβand guitarists are still chasing those tones. Connect to your audio interface, direct to your studio, powered speakers or headphone, or send to an amp and play live. Musician and developer Mike Lawson spent years performing and recording with Merl Saunders and recording/playing with musicians from that scene. The Keystone grew out of those experiences and decades of chasing the sound as a working guitarist. He created this rig from his own live and studio settings, pedals, from authentic schematics and calibrations to his own live rig. The Keystone puts a little of that magic within reach, without the vintage-gear hunt. At the center is Quackmaster III: a touch-sensitive envelope filter with the deep, vocal quack that makes this style of guitar playing so much fun. Around it are bell-like cleans, warm amplifier breakup, singing sustain, spring reverb, phase, octave and delay, even per-accurate amps with their mods. Choose from 65 factory presets or turn the knobs and find your own sound. The effects and settings, attention to details and a few Easter eggs, this is a fun to use as it is to play through. The Keystone includes both the standalone app and an AUv3 plug-in for GarageBand, Logic Pro for iPad and other compatible iOS hosts. Plug into a compatible audio interface to play through the app, or use the plug-in in your recording sessions. One purchase includes the complete rig and AUv3 plug-in for iOS. No subscriptions, no ads, no account required. Just all good things in all good time. Support: support@artistpro.com
Screenshots
Verdict
The clearest difference is price: Cruz GR at $8.90 against The Keystone's $19.99. The Keystone's advantage is iOS requirement (15.0 vs 26.4). On ads, in-app purchases and device support there is nothing between them.
Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS
Cruz GR costs $8.90 and The Keystone $19.99 up front. Neither carries in-app purchases, so what you see is what you pay.
| Parameter | Cruz GR | The Keystone |
|---|---|---|
| Price | $8.90 β better | $19.99 |
| Update frequency | Every 2 weeks | β |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPad, Mac | iPhone, iPad, iPod |
| Requires iOS | 26.4 | 15.0 β better |
| Further details β not scored | ||
| Size | 7 MB | 42 MB |
| Age rating | 4+ | 4+ |
| Developer | CRUZ Conseil | artistpro, LLC |
In-app purchases
Cruz GR
No in-app purchases
The Keystone
No in-app purchases









