the best online music notation software in 2026
we rank Flat first as the best online editor for most people because it offers the strongest real-time co-writing capabilities in a browser without installation. notei takes second place and distinguishes itself with an assistant that reads your score while you write to answer theory questions. Noteflight comes in third, ideal for those seeking a vast library of arrangements. disclosure: we made notei, but ranked it below Flat because Flat’s free real-time co-editing and native apps across more devices cover a wider range of practical situations for collaborative users.
every fact about the other programs was checked against the vendor's own pages on .
- Flat
- notei, our product
- Noteflight
what counts, and how we ranked
we include only editors that run in a web browser with nothing to install. our ranking relies on what you can do for free, how well the tools handle co-writing, export formats, and free plan limits. we verified every fact on each vendor’s website on 26 october 2026 and linked all statements to their sources. we did not run timed tests or benchmarks. prices and limits change often, so you should check the vendor’s site before deciding. notei ranks above Noteflight because its free plan includes the full editor, MusicXML and MIDI export, and an assistant that reads the score; in contrast, Noteflight Basic offers playback, while Premium adds 85 high-quality playback instruments, the catalogue, and MIDI note entry. the ranking rests only on what each vendor's own pages state, as we did not install or test any of these editors.
the ranking at a glance
| software, in rank order | runs in the browser | free plan and its limits | exports | AI features |
|---|---|---|---|---|
| 1. Flat | yes, with nothing to install; native apps for Mac, Windows, iOS and Android too. (source) | Flat Basic: up to 15 scores and 30 instruments, with real-time collaboration. (source) | PDF with Flat branding; MIDI export needs Flat Power. flat.io/desktop lists MusicXML export on Free, but flat.io/pricing lists it under Flat Power. (source) | Flat's AI-powered PDF Import is paid per page; no music-theory assistant is listed. (source) |
| 2. notei (ours) | yes, at app.notei.co, with nothing to install. (source) | the full editor, sampled playback and up to 10 scores in the cloud; assistant credits are limited each month. you need a free account. (source) | MusicXML and MIDI, and PDF with a watermark; WAV is on the paid plans. (source) | a built-in assistant that reads your open score, answers theory questions and makes plain-language edits. (source) |
| 3. Noteflight | yes, an online, browser-based editor. (source) | Noteflight Basic: up to 10 scores and basic notation features. (source) | MusicXML, MIDI and a PDF of the full score; a PDF of all individual parts is paid-only. (source) | no AI features are listed. (source) |
1. Flat
Flat offers strong real-time co-writing capabilities. the software runs directly in your web browser with no installation required, though it also offers native apps for Mac, Windows, iOS, and Android devices. it works on Chromebooks through the browser, a feature explicitly stated by Flat for Education use cases.
the free plan, Flat Basic, allows you to create up to 15 scores and use 30 instruments. it supports importing MusicXML and MIDI files and lets you export PDFs, though exports carry Flat branding. notably, real-time co-editing is available on every plan, including the free tier. for deeper needs, Flat Power costs $9.99 monthly or $49.99 yearly, adding over 180 instruments, MIDI export, brand-free PDFs, inline comments, and version history. it also offers AI-powered PDF import, converting scans into editable scores on a per-page credit basis. this combination makes it ideal for anyone writing with a partner, a band, or a class in real time.
2. notei, our product
we built notei to run in any modern browser at app.notei.co, and it requires nothing to install and only a free account. the free plan gives you the full editor, playback with sampled real instruments, and exports for MusicXML and MIDI. you can open existing MusicXML, MIDI, and MuseScore files, while saving up to ten scores to the cloud, synced between devices. a built-in assistant reads the open score, answers music theory questions, and applies edits described in plain words, using a monthly allowance of assistant credits. notei does not support real-time co-editing. on the free plan, PDF exports carry a watermark, while WAV audio export is reserved for paid plans: notei+ at $9 a month or full score at $18 a month. this setup suits people who mostly write alone and want help with theory and edits while they write.
3. Noteflight
Noteflight is a browser-based editor from Hal Leonard, supporting Chrome, Safari, Edge, Firefox, and Mobile Safari on iOS 15 or later. Noteflight Basic costs nothing and allows up to 10 scores with basic notation features. Noteflight Premium, at $7.95 a month or $49 a year, adds 85 high-quality playback instruments and a library of 80,000+ sheet music titles from Hal Leonard, ArrangeMe, and the Noteflight community. scores can be shared with other signed-in users for viewing, commenting, or editing, but simultaneous real-time co-editing is not listed. entering notes from a MIDI instrument is a Premium feature. this setup suits people who want a large library of arrangements to read and adapt.
what about MuseScore, Dorico and Sibelius
none of MuseScore Studio, Dorico, or Sibelius offers a true browser editor requiring no installation. MuseScore Studio installs on Windows, macOS, or Linux and saves scores to MuseScore.com for link-based sharing. Dorico runs on macOS, Windows, and iPad. Sibelius supports desktop and mobile devices, with Avid listing no browser editor for it; however, Cloud Sharing (which Avid calls Cloud publishing) lets other people view and play a score in a browser. if you can install software, MuseScore Studio remains the strongest free option, fully detailed in our separate ranking of free notation software on this site.
which one to pick
if you need to co-write with others simultaneously, Flat is an excellent choice as it offers real-time co-editing on every plan, including the free one. however, if you prefer writing alone and want an assistant to answer theory questions or apply edits via plain text, notei is your best companion. for those seeking a vast library of arrangements to read and adapt, Noteflight Premium includes 80,000+ titles from Hal Leonard and the community. since all three are free to start, we recommend opening the same short piece in two of these editors for a quick, practical test.
common questions
can several people edit one score at the same time online?
Flat lists real-time co-editing on every plan, including Flat Basic. Noteflight shares scores for viewing, commenting or editing but lists no simultaneous co-editing, and notei has no shared editing yet.
do online notation editors work on a Chromebook?
notei and Flat do, because they run in the browser; Flat states Chromebook support for Flat for Education. Noteflight's support page lists Chrome but does not name Chromebook.
how many scores can I keep for free?
Flat Basic keeps up to 15 scores. Noteflight Basic and notei's free plan keep up to 10 each.
does notei have real-time collaboration?
no. notei has no shared editing yet, though your scores sync across the devices you sign in on. if you write together in real time, Flat is the better pick.
sources
each product's facts come from its maker's own pages:
- Flat: flat.io, flat.io/pricing, flat.io/desktop, flat.io/pdf-import, flat.io/for/music-composers, flat.io/edu
- notei: notei.co/pricing, notei.co, app.notei.co/pricing, notei.co/assistant, notei.co/features
- Noteflight: support.noteflight.com/hc/en-us/articles/360023099451-Which-Browsers-Are-Supported-by-Noteflight, noteflight.com, noteflight.com/plans, noteflight.com/premium, noteflight.com/guide, support.noteflight.com/hc/en-us/articles/360021512951-Importing-and-Exporting-Music
other comparisons: notei vs Flat, notei vs Noteflight, notei vs MuseScore, notei vs Dorico and notei vs Sibelius, all on the notation software alternatives hub. ranked lists: the best free music notation software and the best Finale alternatives. notei's plans and prices are on the pricing page. related guide: write sheet music online.