Quantum Sequencer vs GRDelay
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Quantum Sequencer
This app offers an interactive approach to music composition, focusing on detailed steps that can be arranged into looping sequences. It provides extensive control over note parameters and allows for real-time manipulation and experimentation.
- Interactive step-focused composition
- Detailed step notation (probability, ornamentation)
- Configurable sequence lengths and sub-sequences
- 16 general faders for parameter editing
- MIDI learnable faders
- Programmable loop actions
- Per-sequence MIDI FX, devices, and controllers
Read full descriptionHide full description
Quantum is a performance midi sequencer which approaches music composition with an interactive creation processes - sometimes referred to as 'noodling'. Where pattern or piano-role sequencers are good for music forms (intro/verse/chorus etc) or grid entry, Quantum's approach is built around the idea of a step being the focus - think of the step as a single note or chord written on a music sheet then add a lot of extra notation (like probability of playing or ornamentation say). These highly detailed steps are then aligned into sequences (think melodies) that loop. You can have any length up to 64, but these can be further split into 4 sub-sequences that have their own set of sequencer parameters (like tempo, play direction, transpose etc). To enter step parameters such as note pitch, velocity, gated length etc, 16 general faders are available which allow you to draw, drag, select copy/paste, inc/dec & link together to edit values. These are also midi learnable (midi cc or nrpn) to allow you to use control surfaces or midi controllers. To aid you with faster control Quantum has loop actions which you can program in to carry out tasks when a sequence loops - e.g. transpose, randomise, start or load another sequence etc. With up to 24 sequences playing Quantum introduces a mixer page allowing you to blend midi velocities. Built on the MidiSequencer engine, midi FX, devices & Controllers are now possible per sequence. So why would Quantum be good for your setup? There are many midi enabled IOS & hardware synths that produce exotic timbres if you send them fast & varied midi controls that you just would not hear with keyboard playing or slow tempo tunes. Also, Quantum, embraces experimentation in melody creation and by copy/pasting allowing quick setup of arpeggios & counterpoint tunes that you can create & manipulate on the fly! note : This app sends midi information - you need to use it in conjunction with any midi enabled iOS synth app (e.g. Sunrizer) to hear sounds
GRDelay
This audio effect plugin creates unique sound textures by generating up to 16 stereo 'grains' from delayed input audio. It offers randomization of grain shape, delay time, and pitch-shifting for experimental sound design.
- Granular synthesis-based delay
- Up to 16 stereo grains
- Randomized grain shape and delay time
- Pitch-shifting and cascading grains
- Standalone and AUv3 compatible
Read full descriptionHide full description
GRDelay - Granular Random Delay Plugin (AUv3) GRDelay is an audio effect plugin that can run standalone, or in any AU compatible host application such as Logic Pro or GarageBand. Overview - What's a Granular Random Delay? GRDelay is a randomised delay effect that uses a similar approach to granular synthesis to generate sound. In GRDelay, up to 16 "grains" of stereo sound are created in realtime from delayed copies of the input audio, with control over the grain shape and delay time. There are also options to pitch-shift grains up an octave, and cascade the output from one grain into another. Shape, delay time and pitch-shifting can all be randomised to create some really unusual effects and textures. While GRDelay can produce sounds similar to existing pitch-shifted delays and even shimmer effects, the design is totally original, and to the best of my knowledge, quite sonically unique. I think GRDelay is really one of those effects you need to hear to believe, so please do check out the reviews and demos online. Please note, because there's a "whole lot of random going on" in GRDelay, it's not a good choice if you want a delay that can do tempo / clock-sync'd rhythmic delays. Perhaps take a look at PolyDelay which offers tempo sync to host and musical note length delay times. For more info and support please visit: www.waverley-instruments.com/robjackson
Screenshots
Verdict
The clearest difference is review sentiment: GRDelay at 100% against Quantum Sequencer's 69%. GRDelay also leads on rating (5.0 vs 4.6) and price ($1.99 vs $7.99). Quantum Sequencer's advantage is ratings volume (35 vs 3). On ads, in-app purchases, monetization model and device support 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
Quantum Sequencer costs $7.99 and GRDelay $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.
GRDelay holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: Quantum Sequencer has 35 ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 69% of Quantum Sequencer's written reviews are positive against 100% of GRDelay's.
| Parameter | Quantum Sequencer | GRDelay |
|---|---|---|
| Price | $7.99 | $1.99 — better |
| Rating | 4.6 (35 ratings) | 5.0 (3 ratings) — better |
| Positive reviews | 68.8% of reviews | 100.0% of reviews — better |
| Number of ratings | 35 — better | 3 |
| Update frequency | Every 6 weeks | — |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod, Mac — better |
| Requires iOS | 12.0 | 12.0 |
| Further details — not scored | ||
| Size | 191 MB | 12 MB |
| Age rating | 4+ | 4+ |
| Developer | anthony saunders | Rob Jackson |
Customer experience
Quantum Sequencer
GRDelay
In-app purchases
Quantum Sequencer
No in-app purchases
GRDelay
No in-app purchases









