Comparison

Quantum Sequencer vs ab Phaser X

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • 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 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

About

ab Phaser X

This music app offers a versatile phase modulator with 2 to 12 stages. Customize sweeps with controls for rate, depth, frequency, and feedback. Adjust loudness and blend for your final sound.

Highlights
  • 2 to 12 stage phase modulation
  • Rate control (DAW sync or 0.001Hz-10Hz)
  • Depth, Frequency, and Feedback controls
  • Gain and Mix controls for loudness and blend
Features
Read full description

'ab Phaser X' is a phase modulator featuring from 2 to 12 stages. With 'ab Phaser X' you can control the rate of your phase, whether it's synced to your DAW's BPM or freely from 0,001Hz all the way to 10Hz. Depth, Frequency and Feedback controls help you customise your phase sweeps further and finally, a Gain and Mix control will allow you to control the loudness and the blend of the final Phaser.

Screenshots

Quantum Sequencer4 screens
ab Phaser X1 screens

Verdict

The call

The clearest difference is rating: ab Phaser X at 5.0 against Quantum Sequencer's 4.6. ab Phaser X also leads on price ($5.99 vs $7.99). Quantum Sequencer's advantage is update cadence (every 6 weeks vs every 11 months) and ratings volume (35 vs 5). 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

CostPrice · In-app purchases · Ads · Monetization

Quantum Sequencer costs $7.99 and ab Phaser X $5.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

ab Phaser X 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 5, so its average is the more settled of the two.

UpkeepUpdate frequency

Quantum Sequencer ships an update every 6 weeks, ab Phaser X every 11 months. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.

Scorecard4 real differences · 6 level
Quantum Sequencer versus ab Phaser X: the parameters behind the verdict, then further details
ParameterQuantum Sequencerab Phaser X
Price$7.99$5.99 — better
Rating4.6 (35 ratings)5.0 (5 ratings) — better
Positive reviews68.8% of reviews—
Number of ratings35 — better5
Update frequencyEvery 6 weeks — betterEvery 11 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS12.012.0
Further details — not scored
Size191 MB8 MB
Age rating4+4+
Developeranthony saundersAlejandro Cabrera Zuniga

Customer experience

Quantum Sequencer

All ratings35 ratings
Positive88.6%
Neutral2.9%
Negative8.6%
Written reviews32 reviews
Positive68.8%
Neutral9.4%
Negative21.9%

ab Phaser X

All ratings5 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Quantum Sequencer

No in-app purchases

None

ab Phaser X

No in-app purchases

Questions

Is Quantum Sequencer free?
Quantum Sequencer costs $7.99, with no in-app purchases.
Is ab Phaser X free?
ab Phaser X costs $5.99, with no in-app purchases.
Which has better reviews, Quantum Sequencer or ab Phaser X?
ab Phaser X is rated higher. Quantum Sequencer averages 4.6 out of 5 from 35 ratings, while ab Phaser X averages 5.0 from 5 ratings.
Do Quantum Sequencer or ab Phaser X have ads?
Neither Quantum Sequencer nor ab Phaser X shows ads.
Which is updated more often, Quantum Sequencer or ab Phaser X?
Quantum Sequencer ships an update every 6 weeks, and ab Phaser X every 11 months. Most recently, Quantum Sequencer was updated on November 2, 2026 and ab Phaser X on November 3, 2026.

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