Apps like Guitar Open Tuning Reference

Here are some great alternatives to Guitar Open Tuning Reference by Jean-Philippe Glomot :
Acoustic Guitar Tuner
Acoustic Guitar Tuner
★3.8
Harmonic Tuner Guitar Setup
Harmonic Tuner Guitar Setup
★5.0
Tune Your Guitar
Tune Your Guitar
★4.7
Guitarist's Reference Pro
Guitarist's Reference Pro
★3.2
Guitar Fretboard: Scales
Guitar Fretboard: Scales
★4.8
Guitar Tuner App
Guitar Tuner App
★4.3
Bass Guitar Tunings
Bass Guitar Tunings
★3.9
Coach Guitar Tuner Full Chord
Coach Guitar Tuner Full Chord
★3.7
Guitar Tuner
Guitar Tuner
★4.4
Guitar Tuner - Easy & Pro Tune
Guitar Tuner - Easy & Pro Tune
★4.6
Guitar Tuner: Pro Tuning App
Guitar Tuner: Pro Tuning App
★4.6
Guitar Tuner - Simple Tuners
Guitar Tuner - Simple Tuners
★4.7
Guitar Tuner Guru - Guitar&Uke
Guitar Tuner Guru - Guitar&Uke
★4.6
Guitar Tuner
Guitar Tuner
★4.0
Guitar Tuner, GuitarTunio
Guitar Tuner, GuitarTunio
★4.2
Guitar Note Trainer
Guitar Note Trainer
★4.5