It's MyTabs

It’s MyTabs is an open-source, web-based and self-hostable guitar/bass tablature viewer and player, built to give musicians their own alternative to subscription services like Songsterr or Soundslice. Users can upload tab files in formats such as GP, GPX, MusicXML, or CAPX, sync them with audio or YouTube videos, and play them back in a browser or mobile device. It supports features like MIDI synth track muting/soloing, mobile-friendly UI, dark/light themes, and a variety of cursor modes (auto-scroll, follow-cursor, highlight bar). Because it is deployable via Docker Compose or as a Windows executable, musicians can self-host their own tab library, keep data private, and share links conveniently. The community around it includes home musicians praising it for usability and self-hosting flexibility.