Dahlia Delay vs IMPSY
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Dahlia Delay
This audio effect app provides a tape-style echo with adjustable feedback and warble. It's designed to be lightweight and integrate with other music production apps via Inter-App Audio and Audiobus.
- Tape style delay effect
- Filtered feedback control
- Warble amount control
- Lightweight audio processing
- Inter-App Audio support
- Audiobus support
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Dahlia Delay is a tape style delay effect with filtered feedback and warble amount controls. Built upon the tenet of simplicity, the flora project presents great sounding, lightweight audio effects using Inter-App Audio and Audiobus technologies to allow you to get the sound you want, without sacrificing processing power. More information about the flora project can be found at http://timothy-j.com/flora NB: Dahlia Delay requires either Audiobus or Inter-App Audio capable applications in order to operate. See http://audiob.us for more information.
IMPSY
This app acts as an AI MIDI partner, improvising musical responses to your playing. It can be used as an AUv3 plugin in DAWs or standalone, offering customizable AI models and MIDI mapping.
- AI-powered musical improvisation
- AUv3 MIDI Processor for DAWs
- Standalone Core MIDI virtual ports
- Customizable AI model loading
- Extensive MIDI mapping options
- VoiceOver and Dynamic Type support
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Jam with an AI MIDI partner on iPad and iPhone. IMPSY listens to what you play and improvises musical responses. Load it as an AUv3 MIDI Processor in AUM, AudioBus, Cubasis or Logic Pro for iPad, play it from a USB or Bluetooth controller (or the on-screen faders), and route its output to any instrument app. IMPSY also runs on its own: it appears as Core MIDI virtual ports (IMPSY In / IMPSY Out) and connects directly to a plugged-in controller, so you can play it without a DAW. How it works IMPSY runs a Mixture Density Recurrent Neural Network (MDRNN) on-device. Every note, control change or pitch-bend you send becomes input to the model, which predicts what comes next, including the timing of the response. Shape the conversation with: • Threshold: how long IMPSY waits between your input and its reply • Sigma Temperature: randomness of pitch and control values • Pi Temperature: randomness of which musical "idea" the model picks • Timescale: speeds up or slows down the response • MIDI Thru: passes your own playing through to the output alongside IMPSY's Connect anything • Map each model dimension to any MIDI message (notes, CCs or pitch-bend) on any channel, independently for input and output • Connect a controller directly, or use the always-on IMPSY In / IMPSY Out virtual ports • Import and export your mappings as TOML, compatible with the IMPSY Python toolkit Custom models IMPSY ships with a default 9-dimensional model trained for general musical interaction, but you can load any .tflite model trained with the open-source IMPSY research toolkit: synths, drum machines, lighting rigs, or anything that speaks MIDI. Accessibility IMPSY is built to work with VoiceOver and Dynamic Type. Every control is labelled, the sliders are adjustable by VoiceOver, and status shows as text, not colour alone. Full statement: charlesmartin.au/impsy-auv3/accessibility.html Compatibility • AUv3 MIDI Processor, no audio I/O • Hosts in AUM, AudioBus, Cubasis and Logic Pro for iPad, or any other AUv3 host that supports midi processors. • Also runs standalone with Core MIDI virtual ports and direct device connection • Requires iOS 17 • MIDI stays on-device. No network, no telemetry
Screenshots
Verdict
The clearest difference is price: IMPSY at Free against Dahlia Delay's $1.99. Dahlia Delay's advantage is ratings volume (6 vs 2) and iOS requirement (10.0 vs 17.0). On rating, update cadence, 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
IMPSY is free to download; Dahlia Delay costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.
IMPSY holds the better App Store score, 4.5 against 4.3. Both are backed by a comparable volume of ratings — 6 and 2 respectively.
Dahlia Delay ships an update every 5 months, IMPSY every 4 months. The most recent releases landed on October 24, 2026 and October 17, 2026 respectively.
| Parameter | Dahlia Delay | IMPSY |
|---|---|---|
| Price | $1.99 | Free — better |
| Rating | 4.3 (6 ratings) | 4.5 (2 ratings) — better |
| Positive reviews | 87.5% of reviews | — |
| Number of ratings | 6 — better | 2 |
| Update frequency | Every 5 months | Every 4 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Requires iOS | 10.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 13 MB | 18 MB |
| Age rating | 4+ | 4+ |
| Developer | Flora Creative Ltd. | Charles Martin |
Customer experience
Dahlia Delay
IMPSY
In-app purchases
Dahlia Delay
No in-app purchases
IMPSY
No in-app purchases
Questions
Is Dahlia Delay free?
Is IMPSY free?
Which has better reviews, Dahlia Delay or IMPSY?
Do Dahlia Delay or IMPSY have ads?
Which is updated more often, Dahlia Delay or IMPSY?
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