SampleTank CS vs Midiflow Keyboard (Audiobus)
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
SampleTank CS
This professional mobile sound and groove workstation brings desktop-level virtual instrument power to your iPhone and iPad. It offers a vast array of world-class instruments and patterns for live performance and composition, with expandable sound libraries available for purchase.
- 23 free instruments in 16 categories
- 8-part multitimbral sound module
- Expandable sound library with 2300+ instruments
- Over 1,200 melodic and rhythmic patterns
- 8-track MIDI recorder with audio export
- Intuitive interface and new sound engine
- Song and Live environments
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SampleTank 2 for iOS is a professional, fully featured mobile sound and groove workstation that brings the sound, power and features of desktop virtual instruments to your iPad and iPhone — without compromise. It is designed for professional live performance, song composition and puts a comprehensive array of world-class instruments, sounds and patterns right at your fingertips. SampleTank CS provides all the functionality of the full app, with 23 instruments in 16 categories, so you can try out this powerful workstation for free. Additional sounds are available a la cart via in-app purchase. SampleTank gives you 8 multitimbral instrument slots that you can easily layer or split. Choose from a comprehensive, expandable sound collection that covers virtually every acoustic and electronic sound imaginable. Plus, each instrument category includes instrument riffs and grooves so you can start composing and playing in no time. The included instruments and the new sound engine are derived from the desktop version of SampleTank, IK's flagship workstation, offering you unmatched realism, variety of sound and audio performance. For the first time on iOS, thousands of professional sample-based sounds and patterns can be easily accessed, layered and used for playing live or in the studio. What’s more, SampleTank offers an ever-growing library of sounds and are available via in-app purchase: • Elektronika - a series of electronica and EDM-oriented groove libraries and sound collections that make it easy to create hits in today’s most popular styles • Miroslav Philharmonik — the legendary orchestral libraries, now available on your mobile device! Stunningly realistic and expressive samples of a wide range of orchestra and percussion instruments. • SampleTank PRO - the latest and most high-end sounds and grooves available, letting you create professional-grade compositions on your mobile device • Plus additional libraries covering cinematic sounds, the finest pianos, drum libraries from iconic drummers and much more! SampleTank for iOS offers over 2,300 instruments and over 1,200 MIDI patterns — the largest collection of sounds available for any virtual instrument for iOS. Features: • 23 sounds in 16 categories included free • 8-part multitimbral professional quality sound and groove module • Expandable sound library with 2300+ instrument • Over 1,200 melodic and rhythmic patterns • 8-track MIDI recorder with audio export • Totally redesigned intuitive interface • New sound engine derived from SampleTank 3 for Mac/PC • Zones feature lets you easily create splits & layers on your controller • Song and Live environments for composing and playing • Built-in insert effects and master reverb • MIDI learn feature makes programming external controllers easy • Plug-and-play compatibility with iRig interfaces and controllers • Polyphony: up to 64 voices on new Apple devices
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.
- 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
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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.
Screenshots
Verdict
The clearest difference is price: SampleTank CS at Free against Midiflow Keyboard (Audiobus)'s $2.99. SampleTank CS also leads on update cadence (every 2 months vs every 9 months) and ratings volume (143 vs 6). Midiflow Keyboard (Audiobus)'s advantage is rating (5.0 vs 3.1) and in-app purchases (none vs 10). On 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
SampleTank CS is free to download; Midiflow Keyboard (Audiobus) costs $2.99 up front. SampleTank CS sells 10 one-off in-app purchases. Midiflow Keyboard (Audiobus) asks for nothing beyond the download.
Midiflow Keyboard (Audiobus) holds the better App Store score, 5.0 against 3.1. That said, the two scores are not equally well evidenced: SampleTank CS has 143 ratings behind it against 6, so its average is the more settled of the two. Written reviews point the same way: 29% of SampleTank CS's written reviews are positive against 50% of Midiflow Keyboard (Audiobus)'s.
SampleTank CS ships an update every 2 months, Midiflow Keyboard (Audiobus) every 9 months. The most recent releases landed on November 6, 2026 and November 2, 2026 respectively.
| Parameter | SampleTank CS | Midiflow Keyboard (Audiobus) |
|---|---|---|
| Price | Free — better | $2.99 |
| Rating | 3.1 (143 ratings) | 5.0 (6 ratings) — better |
| Positive reviews | 28.9% of reviews | 50.0% of reviews — better |
| Number of ratings | 143 — better | 6 |
| Update frequency | Every 2 months — better | Every 9 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases — better | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 13.0 | 10.2 — better |
| Further details — not scored | ||
| Size | 1.5 GB | 5 MB |
| Age rating | 4+ | 4+ |
| Developer | IK Multimedia US, LLC | Johannes Doerr |
Customer experience
SampleTank CS
Midiflow Keyboard (Audiobus)
Bugs and requests
SampleTank CS
Reported bugs
3 issues- Incompatible with latest iOS versions
- MIDI issues and lack of device detection
- Purchased content not properly restored
Requested features
4 requests- Add AU/AUv3 support for better DAW integration
- Improve MIDI functionality and mapping
- Allow importing custom samples
- Enhance performance controls (e.g., pitch bend, modulation)
Midiflow Keyboard (Audiobus)
Not enough reviews yet to summarise bugs or requests.
In-app purchases
SampleTank CS
- Organ$4.99
- Strings$4.99
- Brass$4.99
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- Synth Pads$4.99
- The Grid$14.99
- Upgrade to SampleTank$24.99
- Miroslav Philharmonik - Mobile Edition$24.99
- Sonik Synth - Mobile Edition$24.99
- All Sounds$64.99
- SampleTank PRO - All Sounds Pack$64.99
Midiflow Keyboard (Audiobus)
No in-app purchases
Questions
Is SampleTank CS free?
Is Midiflow Keyboard (Audiobus) free?
Which has better reviews, SampleTank CS or Midiflow Keyboard (Audiobus)?
Do SampleTank CS or Midiflow Keyboard (Audiobus) have ads?
Which is updated more often, SampleTank CS or Midiflow Keyboard (Audiobus)?
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