Flat.io Review 2025 – Best Online Music Notation Software?

Flat.io has established itself as a leading online music notation platform, serving over 6 million musicians worldwide. With a 3.5-star rating from 10 Trustpilot reviews, Flat.io offers both free and premium plans for creating, editing, and collaborating on sheet music. This comprehensive review examines its features, pricing, and user experience for musicians of all skill levels.

What is Flat.io?

Flat.io is a cloud-based music notation software that allows users to create, edit, and share sheet music online without installation. Founded in 2012, it provides an intuitive interface for composing music, from simple melodies to complex orchestral scores. The platform supports real-time collaboration, making it ideal for music educators, composers, and ensembles.