Flat – Music notation software: Web-based and Real-time collaboration
Flat is intuitive music notation software for Mac, Windows, web, iOS & Android. Compose, collaborate, play & print sheet music from any device.
Flat – Music notation software: Web-based and Real-time collaboration launched on March 3, 2016 with 207 votes, #114 of 4,409 launches that month and more than 95% of that year's launches. The site was still online in September 2026, 10 years on.
In plain words
Flat is music notation software available on web, desktop, and mobile devices that lets users compose, edit, and print sheet music. It features real-time collaboration tools, allowing multiple users to work on scores simultaneously. The software includes professional notation capabilities with an intuitive interface designed for efficient note input, from solo tabs to full orchestral scores. It supports various musical formats and is suitable for composers, musicians, and music educators who need to create and share polished sheet music across devices.
written from the facts on this page · September 2026
From the sources
Flat is the music notation software that combines professional tools with a beautifully simple interface—so you can compose, collaborate, and publish polished sheet music across web, desktop & mobile with speed and ease. With a clean interface, efficient note input, and intelligent notation tools that adapt to your writing, you can focus entirely on your music. From chamber scores to solo tabs, Flat delivers all the tools needed to compose, edit, and publish with precision. Every essential feature is here—refined for speed and control. Invite collaborators to compose in real time. Multiple users can write and edit the same score simultaneously across devices. Start composing on your laptop,…from flat.io
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