Protokol

MIDI & OSC Monitor

Hexler Limited · net.hexler.Protokol

1.0 out of 5 (1 rating) 5K+ downloads v0.6.7 14.3 MB Android 7.0+ PEGI 3 · Everyone

Download APK 14.3 MB All versions

Signature matches the Google Play version Details

At a glance

Latest version: v0.6.7 (140)
Updated: Sep 24, 2026 (14 days ago)
APK size: 14.3 MB
Requires: Android 7.0+ (API 24)
CPU support: ARM 32-bit, ARM 64-bit
Graphics: OpenGL ES 2.0+
Category: Music & Audio (app)
Listed since: Mar 19, 2021 (at least)
Permissions: 11 (5 sensitive)
Website: hexler.net
Developer contact: [email protected]
Privacy: Developer's privacy policy

About this APK

Protokol is an app by Hexler Limited in the Music & Audio category, listed since at least March 2021. It includes native code for ARM 32-bit and ARM 64-bit, so it runs on practically every phone.

Since version 0.5.6, the APK grew from 13 MB to 14.3 MB and the minimum Android version rose from 6.0 to 7.0. It asks for 11 permissions, 5 of them sensitive, including read shared storage, Bluetooth advertise and Bluetooth connect. It asks for the same permissions as version 0.6.6. The app offers in-app purchases through Google Play.

What's new in v0.6.7

- User interface improvements - Updated for upcoming Google Play requirements - Updated game controller mapping database - Minor bug fixes and improvements

Description

From the listing uploaded by “appupdater”.

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.

Version history

5 versions are listed, going back to v0.5.6. Since v0.6.4 it requires Android 7.0+.

v0.6.7 LATEST Sep 24, 2026 14.3 MB TRUSTED v0.6.6 Sep 10, 2026 14.2 MB TRUSTED v0.6.5 Jul 3, 2026 14.2 MB TRUSTED v0.6.4 Dec 15, 2025 14.2 MB TRUSTED v0.5.6 Jun 2, 2024 13 MB TRUSTED

All 5 versions

Security & authenticity

Security rating: Trusted

Signing certificate

Signature matches the Google Play version Checked by the source store on Sep 24, 2026.
Certificate issued to “hexler” This is the certificate of the Google Play version.
Same certificate as the 2 other versions checked

Store checks and file details

Developer signature verified Sep 24, 2026
Validated against Google Play Sep 24, 2026
Signed byCN=RJ Fischer, OU=hexler, O=hexler, L=Karlsfeld, ST=Bavaria, C=DE
Signing certificate (SHA-1)DC:30:70:32:90:09:27:9B:EB:2C:D0:65:53:BB:2D:B6:42:89:CF:DB
File MD5088058551d36f299496162fd02b3f8df
Uploaded by “appupdater” Gold tier · 117,810 followers · uploading since 2020

Scans and ratings come from the source store; the certificate comparisons are AAPKs's own, made from the files' published signatures (2 other versions compared). AAPKs doesn't scan files itself — compare the MD5 and signer after downloading.

Permissions (11)

Protokol requests 11 permissions, 5 of them sensitive.

Bluetooth advertise Sensitive android.permission.BLUETOOTH_ADVERTISE
Bluetooth connect Sensitive android.permission.BLUETOOTH_CONNECT
Bluetooth scan Sensitive android.permission.BLUETOOTH_SCAN
Modify shared storage Sensitive android.permission.WRITE_EXTERNAL_STORAGE
Read shared storage Sensitive android.permission.READ_EXTERNAL_STORAGE
Change wifi multicast state android.permission.CHANGE_WIFI_MULTICAST_STATE
Full network access android.permission.INTERNET
In-app purchases (Google Play Billing) com.android.vending.BILLING
Prevent the device from sleeping android.permission.WAKE_LOCK
View Wi-Fi connections android.permission.ACCESS_WIFI_STATE
View network connections android.permission.ACCESS_NETWORK_STATE

Required hardware & features

Bluetooth android.hardware.bluetooth
Basic touch input android.hardware.faketouch
Location android.hardware.location
Wi-Fi android.hardware.wifi

Protokol APK: questions and answers

Is there a version of Protokol for older Android phones?

The current version needs Android 7.0 or later. Version 0.5.6 is the newest listed build that installs on Android 6.0 and later. It is an old build: apps that rely on online services may no longer connect when they are this old. Get version 0.5.6 · All versions

Can I install this APK over the version I already have?

Yes, if your installed copy is older. It is signed like the Google Play version, so Android installs it as an update and keeps your data.

Is Protokol free?

The APK is free to download, but the app offers in-app purchases through Google Play.

Is the Protokol APK safe?

No one can promise that a file is safe, but some things can be checked. The source store rates this file Trusted. Its signature matches the Google Play version. It is signed with the same certificate as the 2 other versions checked. After downloading, check that the file's MD5 is 088058551d36f299496162fd02b3f8df.