DelayScaper vs RollTab
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
DelayScaper
This audio effects plugin offers dual dynamic stereo delays that respond to input intensity and note spacing. It allows for experimental sound design, atmospheric textures, and even looping, with bonus effects like octave pitch-shifting and random reversing.
- Dual stereo delay modules
- Dynamic parameter response to audio input
- Host tempo syncable delay times
- Max 8-second delay time
- Octave Grains effect
- Random Reverse effect
- Envelope followers for modulation
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DelayScaper is an AUv3 effects plugin that can run standalone, or in any AUv3 compatible host such as Logic Pro, GarageBand or AUM. DelayScaper currently runs on iOS (iPad & iPhone) and macOS (Intel & Silicon) and is available as a Universal Purchase from the Apple App Store. Overview DelayScaper is a dual dynamic delay effect designed to produce inspiring, and sometimes very unpredictable results that literally responds dynamically to audio input. Playing an instrument through DelayScaper can be especially rewarding when you adjust your playing to what you’re hearing, because DelayScaper can be configured to constantly modify its parameters according to the intensity and spacing of your notes. It’s like having five extra pairs of hands twiddling knobs for you! At its core, DelayScaper comprises two identical stereo delay modules that can run in series or parallel. While it can cover “normal” delay duties, including host tempo syncable delay times, DelayScaper is really for those who like to experiment with sound, especially in the atmospheric and ambient realm. With a maximum delay time of 8 seconds, you can even use DelayScaper as an old-school “free looper” for “Frippertronics” type evolving soundscapes. DelayScaper also features two bonus “one knob FX” effects that are both original designs that complement the core delay processing: “Octave Grains” is a randomised and delayed pitch-shifting algorithm that sits somewhere between a pitch-shifted delay and granular shimmer effect. “Random Reverse” does what you might expect it to do, but often in an unexpected way! Both algorithms will grab random sections of the incoming audio, process it, then feed those into the main delay processing. The dynamics section is where DelayScaper comes to life, and includes dedicated envelope followers for both delays, which can then be used as a modulation source for up to 5 delay parameters for each delay. For example, you can modulate the mix level to create a “ducking delay”, or modulate tone so the delay repeats get brighter or darker depending on how hard or softly you play. A “cascade” feature sends the output of the first delay into the second, allowing you to fine-tune the balance between parallel and series mode.
RollTab
This app transforms your device into an AI-powered piano partner. It listens to your musical phrases and generates real-time continuations using an advanced on-device AI model. You can control various aspects of the AI's output and export your creations as MIDI files.
- AI piano accompaniment
- Real-time music generation
- MIDI keyboard integration
- Adjustable AI parameters
- Live piano-roll view
- MIDI file export
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RollTab turns your iPhone or iPad into an AI piano partner. Connect a USB or Bluetooth MIDI keyboard, play a phrase, and pause. RollTab continues your performance in real time with a 125M-parameter music model running entirely on your device. • Automatic mode answers after you pause • Explicit mode lets you decide when to generate • Live piano-roll view separates your notes from the AI’s continuation • Adjust temperature, continuation length, timing, and pitch range • Pause, continue, start a new session, and export the result as a MIDI file • No account, cloud processing, or internet connection required A MIDI keyboard is required for live input. You can also generate from silence in Explicit mode. Created by Simon Edwardsson — simedw.com
Screenshots
Verdict
The clearest difference is review sentiment: DelayScaper at 100% against RollTab's 0%. DelayScaper also leads on update cadence (daily vs every 4 days) and device support (4 vs 2). RollTab's advantage is price (Free vs $4.99). On ads and in-app purchases 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
RollTab is free to download; DelayScaper costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.
DelayScaper ships an update daily, RollTab every 4 days. The most recent releases landed on October 12, 2026 and October 7, 2026 respectively.
| Parameter | DelayScaper | RollTab |
|---|---|---|
| Price | $4.99 | Free — better |
| Rating | 5.0 (2 ratings) — better | — |
| Positive reviews | 100.0% of reviews — better | 0.0% of reviews |
| Number of ratings | 2 — better | — |
| Update frequency | Daily — better | Every 4 days |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPad, iPod, Mac — better | iPhone, iPad |
| Requires iOS | 12.0 — better | 18.0 |
| Further details — not scored | ||
| Size | 18 MB | 185 MB |
| Age rating | 4+ | 4+ |
| Developer | Rob Jackson | Simon Edwardsson |
Customer experience
DelayScaper
RollTab
In-app purchases
DelayScaper
No in-app purchases
RollTab
No in-app purchases









