s.mart Circle of Fifths app icon

s.mart Circle of Fifths

Interactive Circle of Fifths with scales and chords for any instrument & tuning

s.mart Music Lab · de.smartchord.droid.plug.cof

Not rated yet 50K+ downloads v1.6 110.8 KB Android 6.0+ PEGI 3 · Everyone

  • Signature matches the Google Play version Details

At a glance

Latest version
v1.6 (160)
Updated
Aug 30, 2026 (1 month ago)
APK size
110.8 KB
Requires
Android 6.0+ (API 23)
CPU support
Any (no native code)
Category
Books & Reference (app)
Listed since
May 13, 2022 (at least)
Website
smartchord.de
Developer contact
[email protected]
Privacy
Developer's privacy policy

About this APK

s.mart Circle of Fifths is an app by s.mart Music Lab in the Books & Reference category, listed since at least May 2022. It has no native code, so it runs on any Android processor.

Since version 1.3, the APK grew from 70.7 KB to 110.8 KB and the minimum Android version rose from 4.1 to 6.0.

What's new in v1.6

Android 17 Alignment

Description

From the listing uploaded by “appupdater”.

s.mart Circle of Fifths sets standards! It shows every chord, either triads, 7th or 9th. It works for about 40 instruments and any tuning! You can choose between 300 scales beneath the modes of the major scale like Dorian, Lydian or Mixolydian. Go for the best! ⭐ Innovative 'Scale-circle' opens up new sounds for you ⭐ More than 300 scales besides the modes like Aeolian, Locrian or Phrygian ⭐ Shows triads, 7th or 9th chords ⭐ Chord charts with your favorite fingerings not just for Guitar ⭐ Shows the chords on the piano ⭐ Shows the scales spread on the fretboard ⭐ Works for about 40 instruments and every tuning ⭐ Right- or left-handed fretboards ⭐ Shows sheet music for the chords ⭐ Bass and treble clef ⭐ Hear the chords ⭐ Easily drag the circle to change the key ⭐ Option to simplify names ⭐ Supports about 40 instruments. Not just the common ones like Guitar, Bass, Banjo or Ukulele. The Fretboard Trainer knows also stringed instruments like Cavaquinho, Charango, Cigar-Box-Guitar, Mandola or Mandolin ⭐ 500 tunings are predefined for Guitar, Bass, Banjo, Ukulele a.s.o. ⭐ Custom tunings for every other possible tuning ⭐ Get the scales on the fretboard of your instrument. Not only on the common ones like Guitar, Bass, Banjo or Ukulele ⭐ 14 bright and dark themes ⭐ 30 different color schemes ⭐ The Circle of Fifths builds upon smartChord - the ultimate reference for chords and scales ⭐ Like the other s.mart tools, the Circle of Fifths supports all other relevant smartChord features (e.g. left handed fretboard or Solfège, NNS) ⭐ Circle of Fifths with 100% privacy 🙈🙉🙊 A big thank you 💕 for problems 🐛, suggestions 💡 or feedback 💐: [email protected]. Have fun and success learning, playing and practicing with your Guitar, Ukulele, Bass,... 🎸😃👍 ======== PLEASE NOTE ======== This s.mart app is a plugin for the app 'smartChord: 40 Guitar Tools' (V8.15 or later). It can't run alone! You need to install smartChord from the Google Play store: https://play.google.com/store/apps/details?id=de.smartchord.droid It provides a lot of other useful tools for musicians like the ultimate reference for chords and scales. Furthermore, there is a fantastic songbook, a precise chromatic tuner, a metronome, an ear training quiz, and a lot of other cool stuff. smartChords supports about 40 instruments like Guitar, Ukulele, Mandolin or the Bass and every possible tuning. =============================

Version history

3 versions are listed, going back to v1.3. Since v1.6 it requires Android 6.0+.

All 3 versions

Security & authenticity

Security rating: Trusted

Signing certificate

  • Signature matches the Google Play version Checked by the source store on Aug 30, 2026.
  • Certificate issued to “eTroop.de” 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 Aug 30, 2026
  • Validated against Google Play Aug 30, 2026
  • Signed byCN=Martin Schüle, O=eTroop.de, L=72108 Rottenburg, ST=Germany, C=DE
  • Signing certificate (SHA-1)E9:2D:C0:FD:60:5B:E9:FF:14:86:C6:CD:D6:CF:3C:B8:4B:EE:13:6E
  • File MD54895dee46138fb08c206e521d26b344f
  • 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.

Required hardware & features

s.mart Circle of Fifths APK: questions and answers

Is there a version of s.mart Circle of Fifths for older Android phones?

The current version needs Android 6.0 or later. Version 1.5 is the newest listed build that installs on Android 4.1 and later. Get version 1.5 · 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 the s.mart Circle of Fifths 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 4895dee46138fb08c206e521d26b344f.

Tags

More Books & Reference apps