Midiflow Transposer (Audiobus) vs MIDI Tools
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Midiflow Transposer (Audiobus)
This MIDI effect app for Audiobus 3 lets you transpose notes by octaves and half-tones. It's useful for playing external keyboards in different keys or creating harmonies. The app is free to use.
- Transpose notes by half-tones
- Transpose notes by octaves
- Create harmonies
- Use multiple instances in Audiobus
- Essential MIDI effect
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This simple MIDI effect app for Audiobus 3 allows you to transpose notes. You can shift by octaves and half-tones. This is useful if you want play an external keyboard in a different tone. You can also use it to create harmonies, i.e. create a second voice in an interval. Since this app is so essential, you can get it for free. + Shift notes in half-tone steps + Shift notes in octave steps + Use multiple instances of this effect in Audiobus NOTE: This app requires Audiobus 3. Insert it into one or more MIDI effect ports to affect the data going through the respective pipelines.
MIDI Tools
This application provides a suite of MIDI audio units for iOS, allowing users to manipulate MIDI messages within their DAW's effects chain. It offers tools for altering velocity, transposing keys, monitoring events, and routing MIDI to external hardware or internal buses.
- MIDI message manipulation within DAW effects chains
- 8 AUv3 MIDI audio units
- Velocity and aftertouch alteration
- Key transposition and range restriction
- MIDI event monitoring and reporting
- Tempo-synced trigger blocking
- External and internal MIDI routing
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MIDI Tools is a suite of AUv3 MIDI audio units for iOS that lets you manipulate the MIDI messages inside your DAW’s effects chain, creating complex or otherwise impossible MIDI routings or effects. The app contains 8 MIDI audio units in a single package, which can be loaded in compatible hosts (BeatMaker 3, Cubasis 2, AUM, ApeMatrix etc.). Make sure your host is capable of loading, transmitting to, and receiving MIDI from audio unit MIDI effects. They’re intended to augment existing MIDI processing capabilities, or in scenarios where a host doesn’t provide the required functionality out of the box. 1) MIDI Curve: Alter velocity or aftertouch values (0-127) in a controlled or random manner. 2) MIDI Key Zone: Transpose and restrict the playable key range. Perform velocity fades across various pitch ranges. Generate polyphonic chord fade effects. 3) MIDI Monitor: Monitor MIDI events in an effects chain, with detailed reports. 4) MIDI De-Ghost: Tempo synced trigger block, useful for hardware pad controllers that double-trigger, or removing ghost notes. It can also be used creatively to generate polyrhythms and gate-shifting effects. 5) MIDI Route: External MIDI routing capabilities. Route MIDI to external hardware, loopback to other tracks or banks. Record MIDI audio units generator output in DAWs which lack the ability to perform complex in-app MIDI routing. 6) MIDI Bus: Internal MIDI busing capabilities, designed for DAWs which lack the ability to perform complex in-app MIDI routing. 7) MIDI Latch: Enable latching and sustain capabilities, in any DAW that supports MIDI audio units. 8) MIDI Clone & Filter: Clone and filter incoming MIDI across different channels, in any DAW that supports MIDI audio units.
Screenshots
Verdict
The clearest difference is price: Midiflow Transposer (Audiobus) at Free against MIDI Tools's $4.99. Midiflow Transposer (Audiobus) also leads on device support (3 vs 1). MIDI Tools's advantage is review sentiment (70% vs 33%) and rating (4.7 vs 4.3). On ads, in-app purchases 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
Midiflow Transposer (Audiobus) is free to download; MIDI Tools costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.
MIDI Tools holds the better App Store score, 4.7 against 4.3. Both are backed by a comparable volume of ratings — 7 and 22 respectively. Written reviews point the same way: 33% of Midiflow Transposer (Audiobus)'s written reviews are positive against 70% of MIDI Tools's.
Midiflow Transposer (Audiobus) ships an update every 9 months, MIDI Tools every 4 days. Both last shipped on November 2, 2026.
| Parameter | Midiflow Transposer (Audiobus) | MIDI Tools |
|---|---|---|
| Price | Free — better | $4.99 |
| Rating | 4.3 (7 ratings) | 4.7 (22 ratings) — better |
| Positive reviews | 33.3% of reviews | 70.0% of reviews — better |
| Number of ratings | 7 | 22 — better |
| Update frequency | Every 9 months | Every 4 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free — better | Paid |
| Devices | iPhone, iPad, iPod — better | iPad |
| Requires iOS | 10.2 — better | 11.0 |
| Further details — not scored | ||
| Size | 5 MB | 11 MB |
| Age rating | 4+ | 4+ |
| Developer | Johannes Doerr | Victor Porof |
Customer experience
Midiflow Transposer (Audiobus)
MIDI Tools
In-app purchases
Midiflow Transposer (Audiobus)
No in-app purchases
MIDI Tools
No in-app purchases
Questions
Is Midiflow Transposer (Audiobus) free?
Is MIDI Tools free?
Which has better reviews, Midiflow Transposer (Audiobus) or MIDI Tools?
Do Midiflow Transposer (Audiobus) or MIDI Tools have ads?
Which is updated more often, Midiflow Transposer (Audiobus) or MIDI Tools?
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