Comparison

Midiflow Keyboard (Audiobus) vs simple loop machine

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

Head to head
About

Midiflow Keyboard (Audiobus)

This music app provides a versatile keyboard interface for controlling multiple synth applications simultaneously. It offers various layouts, including piano, scales, and chords, with customizable controls for pitch, modulation, and note velocity. Designed to integrate seamlessly with Audiobus 3, it enhances mobile music production.

Highlights
  • Piano, scale, and chord layouts
  • Multiple independent keyboard strips
  • Adjustable key range and octaves
  • Pitch-bend and modulation wheels
  • Hold mode with unisono option
  • Velocity control via touch or accelerometer
  • Split View/Slide Over support
Features
Read full description

This keyboard for Audiobus 3 allows you to perform music with multiple synth apps at the same time. Use the piano or scale layout to play single notes, and select the chord keyboard for accompaniments. With Audiobus 3, it's super simple to connect the keyboard to your synth apps. + Piano layout + Scale layouts (Min/Maj Blue, Ionian, Dorian, ...) + Chord layout + 2 independent keyboard strips on the iPad, 3 on the iPad Pro + Quickly switch sounds + Adjust visible key range and + Jump to other octaves using up/down buttons + Transpose output in half-tone steps + Modulation wheel + Pitch-Bend wheel + "Hold" mode with unisono option + Note velocity can be controlled via position or acceleration of the touch, or set to a fixed value + Use Split View/Slide Over to display the keyboard next to other apps NOTE: This app requires Audiobus 3. Insert it into one or more MIDI sender ports to control the synth apps in the MIDI output ports of the respective pipelines. DETAILS Midiflow Keyboard is probably the most essential MIDI companion app for Audiobus. It allows you to trigger your synth apps with sophisticated layouts for single notes or chords. With its two keyboards, you can even perform with multiple sounds simultaneously. HANDY CONTROLS The streamlined user interface shows the most important controls on the main screen. Quickly change the visible key range in octave steps – you can even keep holding down keys while doing so. Switch on "hold" and keys will stay pressed until you hit them again. Or activate "unisono" and only one note will sound. And, of course, there are pitch-bend and modulation wheels for effects. PLAY WITH SENSITIVITY It's not only about which notes you play, but how you play them. By default, you play louder notes by hitting them further down the length of the key. You can also make the app interpret the actual velocity of your taps by using the accelerometer. However, if all you want is a fixed velocity on each tap, that is possible, too. OPTIMIZE YOUR LAYOUT Choose from a list of different keyboard styles that match your playing style best. The regular piano layout is just the beginning. You can select from a list of scale layouts to explore their different sounds and play solos without ever hitting a wrong note. Screen space is valuable – hide the pitch-bend and/or modulation wheel if you don't need them, making more space for keys. PLAY CHORDS LIKE A PIANIST Since it can be quite tricky to play chords on a touch screen, this app comes with a unique chord keyboard. The lower row triggers root notes, while the upper rows trigger chords. This layout makes it very easy to play chord accompaniments with index and middle finger that would require two full hands on a real piano. SWITCH SOUNDS QUICKLY The port selector in the upper right corner allows you to specify, for each keyboard, which sound to trigger. You can even select multiple destinations to layer the sounds. In order to reflect the active sound, the color scheme of the keyboard will adjust to match the app's icon. SPLIT VIEW AND SLIDE OVER Midiflow Keyboard works great in Split View and Slide Over, the two multitasking modes in iOS. Just swipe from the right screen side and launch the keyboard. That way, you can trigger nodes while making adjustments in an effect app or Audiobus itself. In order to take full advantage of the screen space, the keyboard is rotated 90 degrees. You can either use the right hand to play it while using the left hand in the main app, or simply rotate the device to use both hands for the keys.

About

simple loop machine

Features
Read full description

simple loop machine is a straightforward loop-style music app: record up to eight samples from the microphone, assign them to pads, then play, loop, reverse, trim, and scratch. No DAW-style complexity—great for ideas, practice, and live sketches. Features • 8-pad recording - Free mode: hold an empty pad to record; release to stop - Fixed mode: set BPM and bars, tap an empty pad to record a fixed length • Play/stop, loop, reverse playback • Waveform view with trim handles • Zoom (full waveform / selection range) • Volume and pitch per pad • Scratch strip (drag left and right) • Mix recording: capture pad playback into one mix; play, export, or delete • Settings: default record mode, default BPM/bars for fixed mode, delete all pads • In-app languages: Japanese, English, Simplified Chinese, Traditional Chinese, Korean Privacy & data • Samples and mixes are stored only on your device • No account required • Microphone is used only for recording to pads • Export uses the system share sheet (Files, AirDrop, etc.) Notes • Use caution with headphones or speakers—levels can be loud • Microphone permission is required on first launch • A real device is recommended for recording (simulator has no mic) Support: contact us via the Support URL on the store listing.

Screenshots

Midiflow Keyboard (Audiobus)4 screens
simple loop machine4 screens

Verdict

The call

The clearest difference is price: simple loop machine at Free against Midiflow Keyboard (Audiobus)'s $2.99. simple loop machine also leads on update cadence (every 4 days vs every 9 months). Midiflow Keyboard (Audiobus)'s advantage is ads (none vs shown) and iOS requirement (10.2 vs 17.0). On in-app purchases 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

CostPrice · In-app purchases · Ads · Monetization

simple loop machine is free to download; Midiflow Keyboard (Audiobus) costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Midiflow Keyboard (Audiobus) ships an update every 9 months, simple loop machine every 4 days. The most recent releases landed on November 2, 2026 and November 5, 2026 respectively.

Scorecard4 real differences · 6 level
Midiflow Keyboard (Audiobus) versus simple loop machine: the parameters behind the verdict, then further details
ParameterMidiflow Keyboard (Audiobus)simple loop machine
Price$2.99Free — better
Rating5.0 (6 ratings) — better—
Positive reviews50.0% of reviews—
Number of ratings6 — better—
Update frequencyEvery 9 monthsEvery 4 days — better
AdsNo — betterYes
In-app purchasesNoNo
MonetizationPaid—
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS10.2 — better17.0
Further details — not scored
Size5 MB5 MB
Age rating4+4+
DeveloperJohannes DoerrGoateeAllstars

In-app purchases

None

Midiflow Keyboard (Audiobus)

No in-app purchases

None

simple loop machine

No in-app purchases

Questions

Is Midiflow Keyboard (Audiobus) free?
Midiflow Keyboard (Audiobus) costs $2.99, with no in-app purchases.
Is simple loop machine free?
simple loop machine is free to download, with no in-app purchases.
Do Midiflow Keyboard (Audiobus) or simple loop machine have ads?
simple loop machine shows ads; Midiflow Keyboard (Audiobus) does not.
Which is updated more often, Midiflow Keyboard (Audiobus) or simple loop machine?
Midiflow Keyboard (Audiobus) ships an update every 9 months, and simple loop machine every 4 days. Most recently, Midiflow Keyboard (Audiobus) was updated on November 2, 2026 and simple loop machine on November 5, 2026.

Other comparisons