In Theory vs ddtctmcc
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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
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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.
ddtctmcc
This app translates touch gestures into MIDI Control Change messages. It offers two recording modes, scene management for storing settings, and extended timing controls for loops. It can run standalone or as an AUv3 plugin.
- 2D touch area for MIDI values
- Loop and Once gesture recording
- Scene support with transition times
- Extended timing and host tempo sync
- Multiple output settings per instance
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ddtctmcc "2D Touch Control To MIDI Control Change" This is a touch control app that is designed to work with touch gestures and output MIDI Control Change messages. This app is available as standalone version that can run in background and as an AUv3. It features basic features: - 2D Touch Area where you can set 3 MIDI values (X, Y and Touch On / Off) that will be sent as MIDI CC messages - Two gesture recording modes: "Loop" and "Once": -- In "Loop" mode the gesture is immediately repeated infinitely. You can restart it and change the direction of gesture loop -- In "Once" mode the gesture is recorded silently and only played back later when "trigger" or "+pause" buttons are pressed. ... and some important extras: - Scene support. You can store all settings in a "scene" and switch between them. There is an option to set a transition time between scenes to morph loops. - Extended timing support. Start/stop and speed of the loop can also be recorded and played back. The recorded gesture loop can follow the host tempo when running in plugin mode. - Layers. Each instance of the app supports multiple output settings; scene switch is synchronised across all layers.
Screenshots
Verdict
The clearest difference is update cadence: ddtctmcc at daily against In Theory's weekly. ddtctmcc also leads on iOS requirement (9.0 vs 13.0). In Theory's advantage is price ($4.99 vs $5.99). On rating, ratings volume, 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
In Theory costs $4.99 and ddtctmcc $5.99 up front. Neither carries in-app purchases, so what you see is what you pay.
On the App Store both sit at effectively the same score — 5.0 for In Theory against 5.0 for ddtctmcc. Both are backed by a comparable volume of ratings — 4 and 3 respectively.
In Theory ships an update weekly, ddtctmcc daily. Both last shipped on November 3, 2026.
| Parameter | In Theory | ddtctmcc |
|---|---|---|
| Price | $4.99 — better | $5.99 |
| Rating | 5.0 (4 ratings) | 5.0 (3 ratings) |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 4 — better | 3 |
| Update frequency | Weekly | Daily — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 13.0 | 9.0 — better |
| Further details — not scored | ||
| Size | 7 MB | 7 MB |
| Age rating | 4+ | 4+ |
| Developer | Cem Olcay | Alexey Nadzharov |
Customer experience
In Theory
ddtctmcc
In-app purchases
In Theory
No in-app purchases
ddtctmcc
No in-app purchases









