Guitar Pro is not available as a web app but there are a few alternatives that runs in the browser with similar functionality. The best open source Online alternative is Flat.io. If that doesn't work for you, our users have ranked more than 50 alternatives to Guitar Pro, but unfortunately only two of them are open source and available as a web app. If you can't find an alternative you can try to remove all filters.
Online music score editor enabling real-time collaboration and editing in your web browser, supporting MusicXML, MIDI, PDF, MP3, WAV, percussion notation, history tracking, Google Hangouts video, metronome tools, and cross-device access for composers and students.
alphaTab is a cross platform music notation and guitar tablature rendering library. You can use alphaTab within your own website or application to load music sheets from files like Guitar Pro or use the built in markup named alphaTex.
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Flat(.io) is really easy to take in charge and near as complete as others installed softwares, you can even listen to what you write, and it tells you your mistakes.. real good light and online tool.