# Protokol - MIDI/OSC Monitor — Control protocol test utility

> Utility for monitoring and logging MIDI, OSC, Art-Net, and gamepad control protocols. (iPhone/iPad app by Hexler LLC.)

- Source: https://appshunter.io/ios/app/protokol-midiosc-monitor/id1451570764 (this page in markdown: same URL + `.md`)
- Developer: [Hexler LLC](https://appshunter.io/developer/1569922581)
- Category: Music, Utilities
- Price: Free with in-app purchases
- Rating: 4.60/5 from 16 App Store ratings · 3 written reviews indexed
- Age rating: 4+
- Requires: iOS 13.0 · 7 MB
- Languages: American English
- Released: 2019-11-23
- Data updated: 2026-08-16
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/protokol-midiosc-monitor/id1451570764/reviews.md

## What is Protokol?

MIDI logging, OSC monitoring, and more...

Protokol is a new utility by Hexler for the creator's toolbox: A lightweight, responsive console app for monitoring and logging control protocols.

Originally built as a MIDI monitor and Open Sound Control network checker, Protokol is designed to handle any complex message stream.

MIDI, OSC, Art-Net and Gamepad controller sources are all supported in the current version - but anything is possible given sufficient demand. Contact us if you'd like to see additional protocols added: Let us know.

## Key features

- MIDI logging
- OSC monitoring
- Art-Net support
- Gamepad controller support
- Control protocol inspection
- Message stream analysis

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Pocket Change | $4.99 | one-time |
| Kind Gesture | $9.99 | one-time |
| Generous Contribution | $19.99 | one-time |


## Recent user reviews (3 of 3)

All indexed reviews: https://appshunter.io/ios/app/protokol-midiosc-monitor/id1451570764/reviews.md

### 5/5 — Fantastic

*2025-01-03*

Thank you just what I needed.

### 4/5 — Hmm…

*2024-02-25*

This filter possibilities are very nice. Unfortunately it does not log messages if app is in background (at least on my iPad). This way I cannot send a MIDI message (e.g. sysex) via TouchOSC and see filtered MIDI messages/response here. Of course, it would be much better to have this filter possibilities directly in TouchOSC.

### 5/5 — Excellent!

*2020-10-06*

Thank you very much for this super handy app. This is how a MIDI and OSC monitor should be done!

## Frequently asked questions about Protokol

### What protocols does Protokol support?

Protokol currently supports MIDI, Open Sound Control (OSC), Art-Net, and Gamepad controllers. The developer is open to adding support for additional protocols based on user demand.

### Is Protokol free to use?

Yes, Protokol is available for free. While it has in-app purchases, the core functionality for monitoring and logging control protocols is accessible without cost.

### What devices is Protokol compatible with?

Protokol is designed for iOS devices, including iPhone, iPad, and iPod. It is suitable for users who need to monitor protocols on the go.

### How often is Protokol updated?

The latest version of Protokol is 0.6.5, last updated on March 17, 2026. This indicates a history of development and potential for future updates.

### What is the age rating for Protokol?

Protokol has an age rating of 4+, making it suitable for a wide range of users. This suggests no mature content is present within the application.

### Can Protokol be used offline?

The description does not explicitly state offline capabilities. However, as a monitoring and logging utility, it likely requires network connectivity for real-time protocol streams.

### What do users like about Protokol?

With a 4.6-star rating from 15 reviews, users generally appreciate Protokol's utility for monitoring and logging control protocols. Its responsiveness and lightweight design are likely key factors.

### Does Protokol have ads?

No, Protokol does not contain advertisements. This ensures an uninterrupted user experience while monitoring and logging control protocols.

## Version history (last 5 releases)

### 0.6.5 — 2026-03-17

- Updated for upcoming App Store requirements
- Updated game controller mapping database
- Minor bug fixes and improvements

### 0.6.4 — 2025-12-12

- Added menu actions and shortcuts
- Fix for hidden menu bar on iOS 26
- Middleware upgrades
- Updated game controller mapping database
- Minor bug fixes and improvements

### 0.6.3 — 2025-11-08

- Fixes for possible problems on iOS 26
- Fixed Bluetooth MIDI controller dialog issues on older iOS
- Updated Privacy Policy: Added additional resellers/payment processors
- Updated game controller mapping database
- Minor bug fixes and improvements

### 0.6.2 — 2025-09-06

- Improved compatibility with latest OS release
- Fixed UI layout issues on larger devices
- Fixed OSC log toolbar port field value
- Updated game controller mapping database
- Minor bug fixes and improvements

### 0.6.1 — 2025-05-21

- Added Bluetooth MIDI controller connection UI
- Fixed potential problems on latest iOS
- Updated game controller mapping database
- Minor bug fixes and improvements

## Apps similar to Protokol

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [AUM - Audio Mixer](https://appshunter.io/ios/app/aum-audio-mixer/id1055636344) | 4.7 (524) | $20.99 | Music |
| [WiDI MIDI Studio](https://appshunter.io/ios/app/widi-midi-studio/id1437308268) | 5.0 (2) | Free | Music |
| [Audulus 4](https://appshunter.io/ios/app/audulus-4/id1592022030) | 4.6 (57) | Free | Music |
| [Midi Controller - Remote & USB](https://appshunter.io/ios/app/midi-controller-remote-and-usb/id1470513354) | 4.1 (42) | Free | Music |
| [MIDI Designer Pro X](https://appshunter.io/ios/app/midi-designer-pro-x/id492291712) | 4.6 (266) | Free | Music |
| [midimittr](https://appshunter.io/ios/app/midimittr/id925495245) | 4.5 (50) | Free | Music |

## More apps by Hexler LLC

- [TouchOSC Mk1](https://appshunter.io/ios/app/touchosc-mk1/id288120394)
- [TouchViZ](https://appshunter.io/ios/app/touchviz/id486139371)
- [KodeLife](https://appshunter.io/ios/app/kodelife/id1569922579)
- [TouchOSC](https://appshunter.io/ios/app/touchosc/id1569996730)

All apps by Hexler LLC: https://appshunter.io/developer/1569922581

## Related topics

[midi monitor](https://appshunter.io/ios/topics/midi-monitor) · [mrmr osc controller](https://appshunter.io/ios/topics/mrmr-osc-controller) · [osc](https://appshunter.io/ios/topics/osc)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-16.*