HomeAppsMusic & AudioKoto 13-stringedApps like Koto 13-stringed Here are some great alternatives to Koto 13-stringed by PTD Studio : Instrument Tuner ★4.4 Guitar Tuner, GuitarTunio ★4.1 Japan Radio Station ★4.0 Ukulele Tuner by Tunio ★4.0 MusicToolkit Lite: 12 String ★3.9 Santoor Musical Instrument ★4.2 Cello Sounds ★3.3 Acoustic Guitar Tuner ★3.8 Advanced Tuner guitar violin ★3.6 Tuner Lite - Instrument Tuner ★3.3 Sitar Sounds - Sitar Ringtones ★4.3 Ultimate Mandolin Tuner ★4.5 Baglama Tuner ★4.1 Mini Tunes - Microtonal Synth ★3.7 Tuner - gStrings ★4.7 Tuner - gStrings ★4.7