Flat vs Sesh

Flat is music-notation software for writing, editing, playing back, and collaborating on scores. It runs on the web, iOS, Android, Mac, and Windows, and supports MusicXML and MIDI import and export. Users can compose, edit, and play scores offline; cloud sync requires Flat Power. Multiple users can write, edit, and comment on the same score from different devices in real time. The free plan includes essential notation tools, playback, and collaboration, but is limited to 15 scores. Flat Basic lists 30 instruments; Power includes more than 180, including HQ studio instruments, alongside unlimited scores and advanced playback. Flat Power costs $9.99 per month or $49.99 per year. The desktop app is free to download and use, with a 15-score cap on its free plan. PDF import requires Flat Power or paid credits, while desktop exports include PDF, MP3, and WAV. Flat for Education integrates with Google for Education, Microsoft Office 365, and Canvas and has a free one-month trial. Personal accounts have a minimum age of 13 in most countries.

Sesh is a collaborative digital audio workstation for making, editing, and sharing music in real time. The studio runs entirely in a browser, without downloads or plugin installations. Producers, vocalists, and musicians can join sessions together, with no stated collaborator limit. Its workspace includes a sound library, synthesizers, audio effects, a sequencer, and a shared piano roll. Changes save automatically, and earlier versions can be restored. The Pro offering lists hundreds of royalty-free samples, loops, and one-shots, with new sounds added weekly, plus WAV export. Project links can be shared through Discord, iMessage, WhatsApp, TikTok, and similar services; listeners do not need accounts. Starter is free forever with limited projects, exports, and one-hour history for non-commercial use. Pro costs $5 a month, billed annually, and adds unlimited projects, exports, storage, collaborators, history, and commercial rights for new songs.