Comparison

Isotope MIDI Keyboard vs MeloDraw

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

Head to head
About

Isotope MIDI Keyboard

This app offers an intuitive and accessible way to play music and learn music theory. Its unique isomorphic grid layout simplifies chord playing and understanding note relationships, making it ideal for both beginners and experienced musicians.

Highlights
  • Isomorphic grid layout for intuitive playing
  • Built-in Element sound engine
  • Audio Unit v3 plugin support
  • MIDI and MIDI over Bluetooth connectivity
  • Velocity-based touch and accelerometer input
  • Customizable themes and layouts
Features
Read full description

Isotope is an isomorphic MIDI keyboard app for iOS. Isotope makes playing music fun and intuitive, while also making music theory more accessible. Unlike traditional keyboard, Isotope's isomorphic grid layout is based on mathematical and geometrical properties of sound itself. When you play it, it's much more intuitive. When you want to learn about music, it shows how notes relate to one another. # Isomorphic Keyboard - If the interval stays the same, the form of your hand stays the same. For instance, when you put your first finger on the C, third finger on the E and the second finger on the G, it's the C major chord. Now that your fingers are in a triangle, if you just go up by one row, now it becomes the F major chord. - Square-based isomorphic keyboards like Isotope resembles stringed instruments tuned in perfect 4th apart from one string to the next. Therefore, if you have an experience in playing stringed instruments like the guitar, the bass, the violin, or the cello, you will get learn to play Isotope quickly. # Element - Built-in Sound Engine for Isotope - Available as an Audio Unit v3 plugin - Element has a versatile sound characteristics resembles double bass and bass guitars in the lower range, electric piano in the mid range and woodwind in the higher frequency range. # Connectivity - Supports MIDI (Garageband, Drambo, FL Studio Mobile etcs.) - MIDI over Bluetooth (For connecting Isotope to your computers / or any other devices that support MIDI over Bluetooth) # Usability - Multi-window and Slide Over support on iPadOS - Velocity based on touch area and accelerometer - 3rd party Audio Unit instrument plugins # Customizability - Row Interval adjustment - Fully customizable themes - Resizable buttons / app windows

About

MeloDraw

Features
Read full description

Draw a melody or a beat and hear something genuinely new every time - not a pre-made pack, a fresh procedural generation each draw. Shape what you draw: adjust tempo and pitch afterward, extend a piece you like, keep every past draw in your history and swipe back through it. Layer a melody with a beat into a Combo, then arrange several drawn pieces into a full song. REAL INSTRUMENTS, ANY SOUND - All 128 General MIDI instruments, played with real sampled sound. - Build your own custom sound three ways: a slider editor, humming into the mic, or a photo's colours. RECORD YOUR OWN VOICE - Play a saved song while recording vocals over it - MeloDraw mixes them together automatically. - Multiple people's takes can sit on the same song, each tagged with who sang it. YOUR MUSIC, ON YOUR DEVICE - No account, no server, no internet connection at all - MeloDraw has no networking code. - Back up your whole library to a file and restore it on a new device whenever you like. - Turn on App Lock to keep your saved music behind Face ID or Touch ID. Free to use, with no in-app purchases.

Screenshots

Isotope MIDI Keyboard4 screens
MeloDraw4 screens

Verdict

The call

The clearest difference is price: MeloDraw at Free against Isotope MIDI Keyboard's $6.99. MeloDraw also leads on update cadence (daily vs every 2 days). On ads, in-app purchases, 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

CostPrice · In-app purchases · Ads · Monetization

MeloDraw is free to download; Isotope MIDI Keyboard costs $6.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Isotope MIDI Keyboard ships an update every 2 days, MeloDraw daily. The most recent releases landed on November 3, 2026 and October 31, 2026 respectively.

Scorecard2 real differences · 8 level
Isotope MIDI Keyboard versus MeloDraw: the parameters behind the verdict, then further details
ParameterIsotope MIDI KeyboardMeloDraw
Price$6.99Free — better
Rating4.9 (10 ratings) — better—
Positive reviews80.0% of reviews—
Number of ratings10 — better—
Update frequencyEvery 2 daysDaily — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaid—
DevicesiPhone, iPadiPhone, iPad
Requires iOS16.0 — better17.0
Further details — not scored
Size3 MB33 MB
Age rating4+4+
DeveloperJaewon ChoiKangsoo Lee

In-app purchases

None

Isotope MIDI Keyboard

No in-app purchases

None

MeloDraw

No in-app purchases

Questions

Is Isotope MIDI Keyboard free?
Isotope MIDI Keyboard costs $6.99, with no in-app purchases.
Is MeloDraw free?
MeloDraw is free to download, with no in-app purchases.
Do Isotope MIDI Keyboard or MeloDraw have ads?
Neither Isotope MIDI Keyboard nor MeloDraw shows ads.
Which is updated more often, Isotope MIDI Keyboard or MeloDraw?
Isotope MIDI Keyboard ships an update every 2 days, and MeloDraw daily. Most recently, Isotope MIDI Keyboard was updated on November 3, 2026 and MeloDraw on October 31, 2026.

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