Altered# vs Unexpected Music
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Altered#
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If you are a serious musician, you are supposed to answer "What is the 7b of D?" It's C, of course. But, were you fast enough? you know, if playing in a gig you are required to think fast... Try Altered#
Unexpected Music
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Understand the fundaments of music, develop your musical ear, intuitively play and create melodies wherever you are, improve your singing or playing, tread new musical paths, invent and create... Unexpected Music is an extremely useful collection of tools for just about anyone interested in making music, from the complete beginner all the way to the seasoned musician. It includes: • An advanced, no-nonsense, and fully customisable ear and musical trainer, which doubles as a random music generator [pro]. • A live-audio analysis tool, which allows you to "see" the notes being played around you – it's like instantly having perfect pitch! Great to train your voice or to play a song by ear [pro]. • A complete scale explorer with countless categories. • A vast collection of chord progressions and a special interface to play them. • A musical sketchbook, to quickly record and develop musical ideas on-the-go. • A unique graphical display of the scales according to their similarities [pro]. • An advanced multi-instrument tuner, which can itself be tuned. • An intuitive transposition function, based on Shepard tones. • Superbly-sounding instruments. • Support for MIDI input and output [pro]. • And, last but not least, the good ‘ol faithful but unforgiving metronome. These tools are all held together by Unexpected Music's heart – the wheel. This innovative and always accessible user interface: • Is an expressive instrument which can be played very easily. • Can be freely rotated – so you can intuitively play a melody regardless of the key and then transpose it effortlessly. • Lets you select or exclude notes with a swipe and thus quickly explore and discover scales. • Allows you to see and thus readily understand the relationships between chords. • And so much more... Let Unexpected Music inspire you to create the unexpected! Please note that some functions are included only with the pro version of Unexpected Music, which can be tested for free for seven days and with no obligation whatsoever.
Screenshots
Verdict
The clearest difference is in-app purchases: Altered# at none against Unexpected Music's 2. On price, update cadence, 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
Both are free to download. Unexpected Music sells 2 one-off in-app purchases. Altered# asks for nothing beyond the download.
Both ship on a similar rhythm, roughly every 5 days. The most recent releases landed on May 16, 2026 and September 14, 2026 respectively.
| Parameter | Altered# | Unexpected Music |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 5 days | Every 5 days |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.4 | 15.0 — better |
| Further details — not scored | ||
| Size | 10 MB | 139 MB |
| Age rating | 4+ | 4+ |
| Developer | Luca Rocchi | Atilio Menendez |
In-app purchases
Altered#
No in-app purchases
Unexpected Music
- 7-Day trial of the pro versionFree
- Upgrade to the pro version$4.99





