Tuner - gStrings

gStrings - a chromatic tuner for the guitar, violin, or any other instrument.

cohortor.org · org.cohortor.gstrings

3.9 out of 5 (11 ratings) 10M+ downloads v3.0.2 4.2 MB Android 7.0+ PEGI 3 · Everyone

Download APK 4.2 MB All versions

Signature matches the Google Play version Details

At a glance

Latest version: v3.0.2 (65)
Updated: Jul 8, 2026 (3 months ago)
APK size: 4.2 MB
Requires: Android 7.0+ (API 24)
CPU support: Any (no native code)
Graphics: OpenGL ES 2.0+
Category: Tools (app)
Listed since: Feb 12, 2021 (at least)
Permissions: 13 (1 sensitive)
Website: cohortor.org/gstrings
Developer contact: [email protected]
Privacy: Developer's privacy policy

About this APK

Tuner - gStrings is an app by cohortor.org in the Tools category, listed since at least February 2021. It has no native code, so it runs on any Android processor.

Since version 2.4.0, the APK grew from 2.3 MB to 4.2 MB and the minimum Android version rose from 4.4 to 7.0. It asks for 13 permissions, 1 of them sensitive: record audio. It asks for the same permissions as version 3.0.1. The app offers in-app purchases through Google Play and can read the advertising ID that ad and analytics services use.

Ratings

3.9out of 511 ratings

5 ★55%
4 ★18%
3 ★9%
2 ★0%
1 ★18%

Ratings from users of the source store — not collected or verified by AAPKs.

What's new in v3.0.2

Tiny bugfix release of the major 3.x rewrite, which introduced lots of improvements under the hood. Most notably, 3.x comes with a new fundamental frequency detection engine utilizing hardware capabilities widely available today, featuring optimized floating-point raw audio processing and a new multi-threaded, quorum- and confidence-based evaluation algorithm.

Description

From the listing uploaded by “appupdater”.

gStrings is a chromatic tuner application measuring sound pitch and intensity. This is the ad supported version. It will let you tune any musical instrument (violin, viola, violoncello, bass, guitar, piano, wind instruments, your own voice/singing). Features include: 1. multiple built-in instruments and tunings, 2. support for user-defined custom tunings, 3. a long list of built-in temperaments (just, pythagorean, meantone, comma, etc.), 4. support for user-defined custom temperaments, 5. orchestra tuning (shifting/redefining tone frequencies), 6. pitch pipe, and many more. If you were looking for a guitar tuner, try it! (*) the INTERNET permission is used for ads only. (**) most of the historic temperaments were included courtesy of NetCat AG.

Version history

5 versions are listed, going back to v2.4.0. Since v3.0.0 it requires Android 7.0+.

v3.0.2 LATEST Jul 8, 2026 4.2 MB TRUSTED v3.0.1 Jun 29, 2026 4.2 MB TRUSTED v3.0.0 Jul 25, 2026 4.2 MB TRUSTED v2.4.2 Jun 11, 2026 2.3 MB TRUSTED v2.4.0 Jul 15, 2026 2.3 MB TRUSTED

All 5 versions

Security & authenticity

Security rating: Trusted

Signing certificate

Signature matches the Google Play version Checked by the source store on Jul 8, 2026.
Certificate issued to “cohortor.org” This is the certificate of the Google Play version.
Same certificate as the 4 other versions checked

Store checks and file details

Developer signature not checked yet Jul 8, 2026
Validated against Google Play Jul 8, 2026
Signed byCN=cohortor, OU=Unknown, O=cohortor.org, L=Unknown, ST=Unknown, C=Unknown
Signing certificate (SHA-1)CC:2A:18:A4:80:93:0F:14:70:87:C0:1A:36:8A:19:84:96:B2:45:9E
File MD54289eb6e03b8f50a43ecd72e9660c75b
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 (4 other versions compared). AAPKs doesn't scan files itself — compare the MD5 and signer after downloading.

Permissions (13)

Tuner - gStrings requests 13 permissions, 1 of them sensitive.

Record audio (microphone) Sensitive android.permission.RECORD_AUDIO
Access adservices ad id android.permission.ACCESS_ADSERVICES_AD_ID
Access adservices attribution android.permission.ACCESS_ADSERVICES_ATTRIBUTION
Access adservices topics android.permission.ACCESS_ADSERVICES_TOPICS
Advertising ID com.google.android.gms.permission.AD_ID
Full network access android.permission.INTERNET
In-app purchases (Google Play Billing) com.android.vending.BILLING
Internal broadcast protection (app-defined) org.cohortor.gstrings.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION
Prevent the device from sleeping android.permission.WAKE_LOCK
Pv (custom) org.cohortor.PV
Read basic phone state android.permission.READ_BASIC_PHONE_STATE
Run foreground services android.permission.FOREGROUND_SERVICE
View network connections android.permission.ACCESS_NETWORK_STATE

Required hardware & features

Basic touch input android.hardware.faketouch
Microphone android.hardware.microphone

Tuner - gStrings APK: questions and answers

Is there a version of Tuner - gStrings for older Android phones?

The current version needs Android 7.0 or later. Version 2.4.2 is the newest listed build that installs on Android 5.0 and later. Get version 2.4.2 · 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 Tuner - gStrings free?

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

Is the Tuner - gStrings 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 4 other versions checked. After downloading, check that the file's MD5 is 4289eb6e03b8f50a43ecd72e9660c75b.