Avid Sibelius is not available as a web app but there are some alternatives that runs in the browser with similar functionality. The best Online alternative is Flat.io, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to Avid Sibelius and six of them are available as a web app so hopefully you can find a suitable replacement. Other interesting Online alternatives to Avid Sibelius are Noteflight, alphaTab, DaCapo Editor and ScoreTail.
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.
Noteflight is an amazing online notation editor. On the free version you get 10+ instruments to choose from, lots of musical symbols and more. On the payed version (Cresendo) you get lots more instruments, guitar tab and sharing options. Best way to wite music on the web.
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.
DaCapo Editor is a free Open Source music sheet editor which allows to easily create nice looking partitions. It is available as a web application as well as a desktop application for Windows, MacOS and Linux.
ScoreTail is a web-based music score editor where you can write, play back, and share sheet music — with no install required.
Learn to play any instrument! Instrument Bible is a virtual fingering chart for brass, woodwind, and string instruments.
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