MUUR vs The Keystone
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
MUUR
This audio effect plugin shapes impact, weight, and character for music production. It offers advanced controls for transients, density, and spatial effects, with multiple processing modes and extensive preset management. Audio processing is handled locally within your compatible DAW or AUv3 host.
- Shape transients and density
- Add color with HEAT and CRUSH
- Three-band shaping with dynamic processing
- Low-frequency character control
- Pitch, frequency shifting, and ring modulation
- Six spatial engines
- 50 factory presets and 50 user slots
Read full descriptionHide full description
MUUR is an AUv3 audio effect for shaping impact, weight and character. Load it on an audio track inside a compatible DAW or AUv3 host. The containing app provides access to instructions, support, privacy information and licenses; audio processing takes place inside your host. Shape transients and density with PRESSURE, add colour with HEAT and CRUSH, and control BODY, PUNCH, WEIGHT, TONE, CLIP and MIX. • FIELD: three-band shaping with dynamic processing and individual mute/solo controls. • RUMBLE: four low-frequency characters. • MOD: pitch, frequency shifting and ring modulation. • SPACE: six spatial engines. • ADAPT: local analysis of incoming audio to help shape the effect. • FX ONLY: use the effect layers independently of the main processing section. • 50 factory presets and 50 user slots, with preset import and export. • ECO, NORMAL and HIGH quality modes. Audio processing and ADAPT analysis take place on your device. MUUR does not upload your audio, require an account or include advertising. A compatible AUv3 host is required for audio processing. Available controls and editor size depend on the host window.
The Keystone
Read full descriptionHide full description
The Keystone dials in the sound and spirit of the early-’70s Bay Area club scene to your iPhone and iPad. More than half a century later, that music is still being played—and 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: MUUR at $7.99 against The Keystone's $19.99. On ads, in-app purchases, device support and iOS requirement 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
MUUR costs $7.99 and The Keystone $19.99 up front. Neither carries in-app purchases, so what you see is what you pay.
| Parameter | MUUR | The Keystone |
|---|---|---|
| Price | $7.99 — better | $19.99 |
| Rating | 3.0 (2 ratings) — better | — |
| Number of ratings | 2 — better | — |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | — |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 16.0 | 15.0 — better |
| Further details — not scored | ||
| Size | 18 MB | 42 MB |
| Age rating | 4+ | 4+ |
| Developer | Christian Alvarez | artistpro, LLC |
In-app purchases
MUUR
No in-app purchases
The Keystone
No in-app purchases





