MIDI Sniffer vs MIDI FX
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
MIDI Sniffer
Capture and share MIDI messages from external instruments. View logs in text or hex with precise timestamps. Export as MIDI files or share via text/email. Supports Bluetooth LE connections and message filtering.
- Capture MIDI messages (text/hex)
- Microsecond precision timestamps
- Share logs via text/email
- Export logs as MIDI files
- Bluetooth LE MIDI connections
- Message filtering
- Color-coded messages
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This app allows you to capture incoming MIDI (Musical Instrument Digital Interface) messages, for example from external MIDI keyboards or accordions with a MIDI system. It is also possible to share the entire log as text or MIDI file, for example with app developers asking for a MIDI dump. Connect a MIDI interface to your Apple device, then connect your MIDI instrument to the interface. Features: - Capture MIDI messages in clear text and hexadecimal digits - Shows timestamps in microseconds precision - Share the log via text message or email - Export log as MIDI file - Establish MIDI Bluetooth LE connections - Different colors are used for better distinction - Apply filters to focus on events of interest
MIDI FX
This app allows you to control and process MIDI signals for music creation. It offers features like harmonization, transposition, and sequencing, enabling you to control external or virtual synthesizers and create complex musical arrangements.
- MIDI signal processing
- Harmonize and Transpose
- Sequencer for synths
- Delay and Looper
- Filter notes by velocity
- Internal instruments
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Buy once and get the iOS and Mac apps (with Family Sharing) Control your MIDI signals and process them in any combination of ways: Harmonize, Transpose, Arpeggiate, etc... Or use the Sequencer to play any external or virtual synth. Use a MIDI interface to unlock the power of the app to control multiple synths with one keyboard, play one note and generate chords, basslines, etc... Use the delay/looper or filter notes based on velocity or other parameters to send to different synths/effects. A MIDI workstation in your pocket (or your iPad/Mac) You can also use some internal instruments (drums sampler, piano or synth) if you are away from your MIDI gear, and sequence whole songs inside the app, or use other synth apps as input/output for MIDI FX. Your imagination is the limit!
Screenshots
Verdict
The clearest difference is in-app purchases: MIDI Sniffer at none against MIDI FX's 1. MIDI FX's advantage is update cadence (every 9 days vs every 36 months). On price, rating, ratings volume and ads 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
Both are free to download. MIDI FX sells 1 one-off in-app purchase. MIDI Sniffer asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 5.0 for MIDI Sniffer against 5.0 for MIDI FX. Both are backed by a comparable volume of ratings — 2 and 5 respectively.
MIDI Sniffer ships an update every 36 months, MIDI FX every 9 days. The most recent releases landed on November 4, 2026 and November 3, 2026 respectively.
| Parameter | MIDI Sniffer | MIDI FX |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (2 ratings) | 5.0 (5 ratings) |
| Number of ratings | 2 | 5 — better |
| Update frequency | Every 36 months | Every 9 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod, Mac — better |
| Requires iOS | 15.6 | 14.7 — better |
| Further details — not scored | ||
| Size | 1 MB | 263 MB |
| Age rating | 4+ | 4+ |
| Developer | Sven Thoennissen | Jorge Arroyo |
Customer experience
MIDI Sniffer
MIDI FX
In-app purchases
MIDI Sniffer
No in-app purchases
MIDI FX
- Unlock app$9.99








