Amazing Slow Downer vs Harmony Cloud Pro
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Amazing Slow Downer
This app allows musicians to adjust the playback speed of music without altering its pitch. It supports looping sections, changing tuning and key, and even speeding up audio. Ideal for learning songs, techniques, or improving transcription skills.
- Adjust playback speed (25%-200%)
- Maintain pitch while changing speed
- Seamless looping
- Change tuning and musical key
- Supports Apple Music streaming
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If you're a musician who likes to learn new songs and techniques by listening to the same piece of music over and over but wish that the music could be played a little slower, then you'll enjoy Amazing Slow Downer. You can repeat any section of the music at full speed, slow it down or even speed it up by changing the speed between 25% (1/4 of original speed) and 200% (double speed) without changing the pitch! Change the tuning or musical key? No problem, Amazing Slow Downer handles that as well. Setup seamless loops by touching the "Set" buttons during playback. Amazing Slow Downer is the ideal tool for any musician, transcriber or dancer wanting to improve their skills. New - Support for streaming "Apple Music" audio! Note: Some functions such as "Pitch change" and "Equalizer" are not available when playing "Apple Music" songs. Please note: According to Spotify, third party apps will not any longer have access to streaming Spotify content in a way that works for slowing down / pitch change audio starting September 1, 2022. This will affect Amazing Slow Downer. This means that you should NOT buy Amazing Slow Downer if playing Spotify content is your only use of the app. This change does NOT affect any other type of audio content that Amazing Slow Downer can play back.
Harmony Cloud Pro
This app helps musicians of all levels develop their ear for harmony and improvisation. It generates endless, unpredictable chord progressions based on user-selected chords, allowing for personalized learning and exploration of musical concepts.
- Ear training for musicians
- Improvisation exploration
- Generates unpredictable chord progressions
- Customizable tempo, volume, and key
- Tailorable to all skill levels
- Patented harmonic algorithm
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Understanding harmony is an essential skill for any musician. Harmony is the springboard that elevates melodies to their full emotional potential. Harmony Cloud™ is a revolutionary step forward in the world of ear training created by world renowned jazz vibraphonist and music educator Stefon Harris, and software engineer and jazz trombonist Kate Jiang. It is designed to help all musicians, from beginner to professional, expand their ears, deepen their understanding of harmony, and fearlessly explore the world of improvisation. Its underlying patented harmonic algorithm stitches together chords you select into an unending source of unpredictable, yet musical, chord progressions. Harmony Cloud can be tailored to any musician's or teacher’s needs. Chord progressions can range from very simple I, IV, V to progressions that include hundreds of chords. This makes it easy to learn and grow at your own pace. You have control of all aspects of the music including tempo, volume, sounds, key signature, and much more. Privacy Policy: https://harmonycloudmusic.com/privacy Terms & Conditions: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is price: Harmony Cloud Pro at Free against Amazing Slow Downer's $14.99. Harmony Cloud Pro also leads on rating (5.0 vs 3.9) and update cadence (weekly vs every 2 months). Amazing Slow Downer's advantage is in-app purchases (none vs 2) and chart position (#19 vs unranked). On ads, device support and iOS requirement 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
Harmony Cloud Pro is free to download; Amazing Slow Downer costs $14.99 up front. Harmony Cloud Pro sells 2 in-app purchases, starting at $5.99 per month. Amazing Slow Downer asks for nothing beyond the download.
Harmony Cloud Pro holds the better App Store score, 5.0 against 3.9. That said, the two scores are not equally well evidenced: Amazing Slow Downer has 459 ratings behind it against 65, so its average is the more settled of the two. Written reviews point the same way: 69% of Amazing Slow Downer's written reviews are positive against 87% of Harmony Cloud Pro's.
Amazing Slow Downer ships an update every 2 months, Harmony Cloud Pro weekly. The most recent releases landed on October 20, 2026 and October 15, 2026 respectively.
| Parameter | Amazing Slow Downer | Harmony Cloud Pro |
|---|---|---|
| Price | $14.99 | Free — better |
| Rating | 3.9 (459 ratings) | 5.0 (65 ratings) — better |
| Positive reviews | 68.8% of reviews | 86.7% of reviews — better |
| Number of ratings | 459 — better | 65 |
| Update frequency | Every 2 months | Weekly — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | Free with in-app purchases — better |
| Best chart rank | #19 — better | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 — better | 15.1 |
| Further details — not scored | ||
| Size | 6 MB | 194 MB |
| Age rating | 4+ | 4+ |
| Developer | Roni Music | The Melodic Progression Institute LLC |
Customer experience
Amazing Slow Downer
Harmony Cloud Pro
Bugs and requests
Amazing Slow Downer
Reported bugs
3 issues- Playback freezing or not working as expected
- Inability to access purchased songs from iTunes library
- Connectivity issues when trying to use with Spotify
Requested features
5 requests- Add ability to record and import voice memos
- Improve library management and organization
- Implement Audiobus support for looping in other apps
- Add more precise speed and pitch adjustment controls
- Provide option to display waveform for better visualization
Harmony Cloud Pro
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Amazing Slow Downer
No in-app purchases
Harmony Cloud Pro
- Monthly7 Days trial$5.991 Month
- Annual7 Days trial$59.991 Year
Questions
Is Amazing Slow Downer free?
Is Harmony Cloud Pro free?
Which has better reviews, Amazing Slow Downer or Harmony Cloud Pro?
Do Amazing Slow Downer or Harmony Cloud Pro have ads?
Which is updated more often, Amazing Slow Downer or Harmony Cloud Pro?
Other comparisons
