The best alternatives to Fretboarder are Uberchord, Fret Zeppelin, and MelodiQ. If these 3 options don't work for you, we've listed a few more alternatives below.
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AssemblyAI— Speech-to-Text API with superhuman accuracy
MelodiQ helps you to learn and play your favorite songs on guitar with your own AI music teacher! The app will listen to your playing and provide instant feedback on the accuracy Great For BEGINNERS and ADVANCED PLAYERS: https://itunes.apple.com/app/apple-store/id1437132566?pt=207747&ct=Product%20Hunt&mt=8
Moosiko's mission is to make learning the guitar simple and more accessible for everyone. Just select your favorite song and follow the step-by-step instructions. Beginners with no experience can learn to play their favorite song on the guitar in just 3 days.
Learning the notes of the fretboard is foundational to unlocking musical freedom on your instrument. Fretboard Forever guides you through the daunting task using a set of actionable and measurable goals to instinctively knowing the notes of the fretboard.