Circle of 5ths
v2.1 · 27.3 MB · code 17
Verify you're human
Solve this to start the download.
File information
UpdatedNov 18, 2025
PublishedMar 23, 2023
Packageanton.zhvakin.circle_of_fifths
Versionv2.1 (17)
Size27.3 MB
MD575d2d24599b0b3f56dd7c7e53e3bde06
Min SDK21
ABIsarmeabi-v7a, arm64-v8a
Malware scanTRUSTED
Signature SHA1E9:94:33:8F:D8:05:BD:8A:DE:A9:92:0F:F5:08:B8:4A:E5:38:CC:06
SignerCN=Android, OU=Android, O=Google Inc., L=Mountain View, ST=California, C=US
Total downloads100,000
This version100,000
DeveloperAnton Zhvakin
Age ratingEveryone
What's new in v2.1
- fixed enharmonic change(there were different signs of alterations in a key at the same time);
- fixed scale degree representation(I II III ... now are I ii iii ...);
- fixed sounding chord(no inversions now).
- fixed scale degree representation(I II III ... now are I ii iii ...);
- fixed sounding chord(no inversions now).
Security scan
TRUSTED
- Developer signature verified 2025-11-18
- Signature SHA1 E9:94:33:8F:D8:05:BD:8A:DE:A9:92:0F:F5:08:B8:4A:E5:38:CC:06
- File MD5 75d2d24599b0b3f56dd7c7e53e3bde06
How to install Circle of 5ths v2.1 on Android 5.0 Lollipop+
Takes about 2 minutes. You'll need roughly 27.3 MB of free storage.
- Grab anton.zhvakin.circle_of_fifths_17.apk — hit the Download button above (27.3 MB). If your browser warns about APK files, choose Keep or Download anyway — that warning fires on every APK, not just this one.
- Trust your browser to install — on Android 8+ go to Settings → Apps → Special access → Install unknown apps, pick the app you downloaded with (Chrome, Firefox, Files, etc.), and flip Allow from this source. On older Android, toggle Unknown sources under Security.
- (Optional) Verify the file — compute the MD5 of the downloaded APK and make sure it matches 75d2d24599b0b3f5…. Any difference means the file is corrupted or tampered — delete and re-download.
- Open the APK — tap the download notification, or find anton.zhvakin.circle_of_fifths_17.apk in your Files app under Downloads, then tap it. Android's package installer will appear.
- Check the signer — the install screen will name the publisher. For this build it should read CN=Android, OU=Android, O=Google Inc., L=Mountain View, ST=California, C=US. If it doesn't match, cancel — you have the wrong file.
- Review permissions & tap Install — scroll the permission list, then confirm. If Play Protect flags it, tap Install anyway (this APK was scanned as TRUSTED).
- Done — open Circle of 5ths — tap Open on the install screen, or find the Circle of 5ths icon in your app drawer (this build targets armeabi-v7a/arm64-v8a devices).
Common install errors for Circle of 5ths
- "App not installed" — usually means an older or differently-signed version is already on your device. Uninstall it first, then retry. Your data may be lost unless you back it up.
- "Parse error" — the APK is for a newer Android than yours. This version needs Android 5.0 Lollipop or later. Pick an older build from the versions list below.
- "There was a problem parsing the package" — the download was interrupted. Delete the file and re-download over Wi-Fi.
- Works on one phone but not another — this build ships armeabi-v7a/arm64-v8a native code. Devices with a different CPU will reject it.