Comparison

Midi Echo AU vs Spiral Chorus

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

Head to head
About

Midi Echo AU

This app creates repeating MIDI note effects, similar to audio echoes but for digital music signals. It allows for independent control of note-on and note-off messages, offering extensive customization for musical expression.

Highlights
  • Selectable echo types (fixed, ping pong, taper)
  • Adjustable number of echoes (0-20)
  • MIDI velocity reduction for quieter echoes
  • Define pitch interval for successive echoes
  • Tempo sync or mSec delay time
  • Set MIDI channel for echoes
  • Disable individual echoes
  • MIDI thru control
Features
Read full description

AUv3 Midi Fx - Midi Echo online manual here: http:/amssoftware.org/manual/MidiEchoManual.pdf Note : AUv3 midi apps need a compatible host (AUM,Audiobus 3, Cubasis, BM3 etc). So what is a midi echo? It is similar to the audio echo effect where copies of the original audio are repeated at regular time intervals but with some form of change (e.g. quieter). But unlike audio, midi is digital in nature (low resolution 8 bit mostly) and focused around the midi note on & off message used to control synths etc. This app acts on midi note-on independently from the note-off but when the note – off appears it echoes the release of the note-on in the same way the note-on was echoed (pitch interval etc) even if the UI controls have changed. UI Controls exist to allow you to: * Select the type of echo (fixed, ping pong, taper) * Vary the number of echoes (from 0 to 20) * Make echoes quieter by reducing the midi velocity * Define the pitch interval (semitone) of all successive echoes * Select the delay time between echoes either tempo sync or in mSec * Define the delay type (fixed, tempo, random 50, random 20) * Set the midi channel of echoes (1-16) so that other synths can select the echo only * Disable individual echoes - to allow you to play chords with a small or 0 delay * Set Midi thru to keep/remove the original note messages * Panic button to quickly turn off all notes * Setup control automation as all controls are AU Parameters

About

Spiral Chorus

This music effect plugin offers an analog-modeled LCR chorus with touch-friendly controls and immersive 3D visuals. It seamlessly integrates into DAWs for iOS, adding depth and texture to various music productions.

Highlights
  • Analog Modeled LCR Chorus
  • Touch-Friendly Controls
  • Immersive 3D Visuals
  • Versatile Music Application
  • Optimized for iOS
  • Seamless DAW Integration
Features
Read full description

FX Forms #001 - Spiral Chorus from Wild Surmise Music, number one in the series of AUv3 FX plugins. Key Features: - Analog Modeled LCR Chorus: Delve into the rich, warm textures of an analog-modeled LCR (Left-Center-Right) chorus effect, bringing a new dimension to your tracks. - Touch-Friendly Controls: With an interface tailored for iOS, Spiral Chorus offers intuitive, touch-friendly controls. Effortlessly sculpt your sound with responsive sliders and xy pads, ensuring a seamless workflow. - Immersive 3D Visuals: Enhance your audio manipulation experience with captivating 3D visuals in the background. - Versatile Application: Whether you're working on dreamy soundscapes, dynamic beats, or cutting-edge experimental sounds, Spiral Chorus adds a layer of depth and texture to your music. - Optimized for iOS: Crafted specifically for the iOS environment, Spiral Chorus ensures a stable, high-performance experience on your favorite devices. 3D Visuals leverage SceneKit and Metal Shaders providing good visual performance on iOS devices. - Seamless Integration: Use Spiral Chorus seamlessly within your favorite DAW as an AUv3 plugin, fitting perfectly into your existing workflow.

Screenshots

Midi Echo AU1 screens
Spiral Chorus1 screens

Verdict

The call

The clearest difference is price: Spiral Chorus at Free against Midi Echo AU's $1.99. Spiral Chorus also leads on rating (5.0 vs 3.5) and review sentiment (89% vs 50%). Midi Echo AU's advantage is in-app purchases (none vs 3) and update cadence (every 6 weeks vs every 15 months). On ratings volume, ads 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

Spiral Chorus is free to download; Midi Echo AU costs $1.99 up front. Spiral Chorus sells 3 one-off in-app purchases. Midi Echo AU asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Spiral Chorus holds the better App Store score, 5.0 against 3.5. Both are backed by a comparable volume of ratings — 8 and 15 respectively. Written reviews point the same way: 50% of Midi Echo AU's written reviews are positive against 89% of Spiral Chorus's.

UpkeepUpdate frequency

Midi Echo AU ships an update every 6 weeks, Spiral Chorus every 15 months. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.

Scorecard7 real differences · 3 level
Midi Echo AU versus Spiral Chorus: the parameters behind the verdict, then further details
ParameterMidi Echo AUSpiral Chorus
Price$1.99Free — better
Rating3.5 (8 ratings)5.0 (15 ratings) — better
Positive reviews50.0% of reviews88.9% of reviews — better
Number of ratings815 — better
Update frequencyEvery 6 weeks — betterEvery 15 months
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaidFree — better
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS11.0 — better16.0
Further details — not scored
Size13 MB12 MB
Age rating4+4+
Developeranthony saundersTom Power

Customer experience

Midi Echo AU

All ratings8 ratings
Positive62.5%
Neutral0.0%
Negative37.5%
Written reviews6 reviews
Positive50.0%
Neutral16.7%
Negative33.3%

Spiral Chorus

All ratings15 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews9 reviews
Positive88.9%
Neutral11.1%
Negative0.0%

In-app purchases

None

Midi Echo AU

No in-app purchases

3 purchases

Spiral Chorus

One-time3
  • Small Tip$1.99
  • Medium Tip$4.99
  • Large Tip$9.99

Questions

Is Midi Echo AU free?
Midi Echo AU costs $1.99, with no in-app purchases.
Is Spiral Chorus free?
Spiral Chorus is free to download, with in-app purchases available.
Which has better reviews, Midi Echo AU or Spiral Chorus?
Spiral Chorus is rated higher. Midi Echo AU averages 3.5 out of 5 from 8 ratings, while Spiral Chorus averages 5.0 from 15 ratings.
Do Midi Echo AU or Spiral Chorus have ads?
Neither Midi Echo AU nor Spiral Chorus shows ads.
Which is updated more often, Midi Echo AU or Spiral Chorus?
Midi Echo AU ships an update every 6 weeks, and Spiral Chorus every 15 months. Most recently, Midi Echo AU was updated on November 2, 2026 and Spiral Chorus on November 3, 2026.

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