Flat vs Sibelius
Both are notation apps. Flat online collaborative music notation software; Sibelius music notation software for writing and publishing scores. Here is how they compare on the things that decide it.
About Flat
Flat is a browser-based music notation editor for composing, editing, and publishing sheet music, designed around a simple interface paired with professional notation tools. It emphasizes intelligent note input and real-time collaboration so multiple people can write in the same score at once. Flat supports composing everything from solo tabs to chamber and ensemble scores, with customizable layouts, styles, and templates covering margins and spacing, staff sizing, measure numbers, and colored noteheads. It offers a large instrument library (180+ instruments, including high-quality studio sounds), advanced playback with adjustable part volumes and reverb, and the ability to upload reference audio from YouTube, SoundCloud, and MP3 files. Scores sync automatically across the web, iOS, and Android, offline editing is supported with later syncing, and the platform integrates with learning-management systems such as Google Classroom, Canvas, and Schoology. Users can also browse and explore a large community library of user-created scores. Flat is suited to composers, students, educators, and hobbyists who want to collaborate and work across devices. It is available via web browser and as iOS and Android apps. Pricing is freemium: a free tier covers basic use, while paid "Power" plans (subscription, with a one-time lifetime option) unlock unlimited scores, premium instruments, and advanced features.
About Sibelius
Sibelius is Avid's music notation software for composing, arranging, editing, printing, publishing, and sharing scores. Long established as an industry-standard tool in areas such as film scoring, orchestral publishing, and music education, it is offered in multiple editions to suit different needs. Sibelius provides note input and editing, playback through bundled sounds, and engraving and layout tools, with capabilities scaling by edition. The free Sibelius First is limited to a small number of staves for newcomers, Sibelius Artist increases the staff limit and toolset for hobbyists and aspiring composers, and Sibelius Ultimate adds unlimited staves, full engraving and layout control, advanced articulations, cross-staff notation, condensed scores, video sync with timecode, a large professional sound library, and an educational worksheet creator. It includes Sibelius Cloud Sharing for sharing scores online, supports MIDI copy/paste with Pro Tools, and offers optional add-ons for audio transcription and music scanning. Sibelius targets composers, arrangers, publishers, educators, and students from beginner to professional level. It runs on Windows and macOS desktops plus mobile apps for iPhone/iPad, Android, and Chromebook. Its pricing model is freemium and subscription-based: a free entry tier alongside paid Artist and Ultimate editions available as subscriptions or perpetual licenses, with academic discounts.