Note Pro! vs In Theory
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Note Pro!
Learn to play musical notes for your instrument with interactive exercises. Master sight-reading, chords, and rhythm through a game-like interface designed for effective brain integration. Practice anytime, anywhere.
- Instrument-specific exercises
- Authentic instrument sounds
- Interactive note presentation and repetition
- Game-like learning interface
- Intuitive operation
- Supports piano, violin, saxophone, flute, guitar
Read full descriptionHide full description
The notes are the ABC's of music. With Note Pro you will learn how to play the notes specifically for your instrument. Practicing can be tedious. Take your favorite piece and play it easily by sight. With Note Pro you with learn the foundations that will enable you to do this. In spite of the playful visual appearance there underlies a system. The system has been successfully applied and is based on the main principle that an optimum is acquired through interconnection through the brain. Due to the sober interface the cross linking in our brain is optimised. In addition to the notes you should be able to handle ton and the specific accidentals, the cords and rhythm and how to grasp a ton on an instrument. For the piano our Pianopro is the perfect tool to learn the necessary basics. What can the Note Pro do? * Choose your instrument! The Note Pro offers exercises specifically tailored to you. * So far, piano, violin, saxophone, flute, and guitar/electric guitar are available on Note Pro * Each instrument has an authentic sound * The new notes will first be presented and then repeated in a training session * The appearance of the stave and the colorful notes make learning effective and fun * Note Pro has the look and feel of a game. New notes are learnt along the way, one at a time. * The Note Pro can be operated intuitively. Explanations are not necessary * At the airport, on the train or at the beach. Upload Note Pro on your iPhone and become a Note Pro.
In Theory
This app provides a unique interval-based MIDI keyboard with over 110 scales. It allows for flexible chord creation by toggling additional intervals and notes from different octaves. It integrates with external MIDI keyboards and sequencers for advanced music production.
- Interval-based MIDI keyboard
- Over 110 built-in scales
- Customizable chord voicing
- MIDI keyboard input support
- MIDI CC message control
- AUv3 plugin compatibility
- Visual scale and note display
Read full descriptionHide full description
In Theory is an interval based MIDI keyboard app with more than 110 scales. It has a keypad at the bottom with the interval buttons like +2, +1, 0, -1, -2 which would change the current note. Zero means the current note, +1 means the note after the current note, +2 means two notes after the current note, -2 means two notes before the current note in the scale and so on. Above the keypad, you can toggle additional intervals in the scale for creating chord voices. You can also select the notes from an octave above and an octave below for creating rich, extended chords. You can use your MIDI keyboard to play In Theory as well. The middle C4 key on your MIDI keyboard triggers the 0 (zero) button on the app's keypad. The white notes after the C4 note would trigger the positive buttons, the white notes before the C4 note would trigger the negative notes on the keypad. You can also toggle the chord intervals with MIDI CC messages. You can set a MIDI CC number and a MIDI Channel for toggling the chord intervals from the settings menu. If you send a MIDI CC value between 0-62, you can toggle the chord intervals respectively. With the MIDI capabilities, you can also sequence the app with a MIDI sequencer app like PolyBud, ShiftBud, MelodyBud etc. In Theory has more than 110 scales built-in. You can also use the custom scales you made in ScaleBud 2 app as well. The key and scale could be changed externally from a MIDI controller in AUv3 plugin with the AU parameters. The circular display on the UI will show you where you are in the scale. Also, when you play a note, you will see the every playing note on the screen with the root note and the chord intervals. Please note that In Theory is a MIDI app and does not produce any kind of sound on its own. You need to connect the MIDI output of the app to an audio app's MIDI input. For the AUv3 plugin you'll need an AUv3 host app such as AUM, Cubase, Nanostudio, apeMatrix etc.
Screenshots
Verdict
The clearest difference is rating: In Theory at 5.0 against Note Pro!'s 4.5. In Theory also leads on in-app purchases (none vs 10) and review sentiment (100% vs 66%). Note Pro!'s advantage is price ($0.99 vs $4.99) and iOS requirement (8.0 vs 13.0). On ratings volume, ads, monetization model 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
Note Pro! costs $0.99 and In Theory $4.99 up front. Note Pro! sells 10 one-off in-app purchases. In Theory asks for nothing beyond the download.
In Theory holds the better App Store score, 5.0 against 4.5. Both are backed by a comparable volume of ratings — 2 and 4 respectively. Written reviews point the same way: 66% of Note Pro!'s written reviews are positive against 100% of In Theory's.
Note Pro! ships an update every 2 months, In Theory weekly. The most recent releases landed on October 23, 2026 and October 15, 2026 respectively.
| Parameter | Note Pro! | In Theory |
|---|---|---|
| Price | $0.99 — better | $4.99 |
| Rating | 4.5 (2 ratings) | 5.0 (4 ratings) — better |
| Positive reviews | 66.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 2 | 4 — better |
| Update frequency | Every 2 months | Weekly — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 8.0 — better | 13.0 |
| Further details — not scored | ||
| Size | 9 MB | 7 MB |
| Age rating | 4+ | 4+ |
| Developer | barnsystem GmbH | Cem Olcay |
Customer experience
Note Pro!
In Theory
In-app purchases
Note Pro!
- Piano for childs$0.99
- Flute$0.99
- Electric guitar$1.99
Show 7 moreShow fewer
- Recorder$1.99
- Saxophone$1.99
- Violin$2.99
- clefs$2.99
- Piano for adults$2.99
- Allrounder$2.99
- Allrounder violin$3.99
In Theory
No in-app purchases









