Flat

flat.io ↗

Notation writing with collaboration and desktop options

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SI Score: 80/100
Pricing: Freemium AI reading, not confirmed
Free plan: Yes AI reading, not confirmed
Sign-up required: Not confirmed

Collaboration music-notation composition

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Answers use saved listing facts and recorded sources.

What it does

Flat offers online music notation, real-time collaboration, a community and desktop software.

Use Flat to write a score and invite collaborators to edit it together. The free Basic plan supports 15 scores, MIDI and MusicXML import, MIDI-device input and offline composition. Windows and Mac desktop apps sit alongside the web editor.

Power adds unlimited scores, MusicXML/MIDI export and advanced print and playback controls. Turning a PDF or photo into editable notation uses one credit per page; those credits are distinct from ordinary score creation. Education and document-snippet products have separate offers.

Strengths

Real-time score collaboration

Best for

Musicians co-writing a score

Sources

Music Notation Software for Web, Desktop & Mobile – Flat (Oct 26, 2026)
Flat pricing and plan limits (Oct 26, 2026)

SI Score

80/100

#1 in Music

Based on published information. No hands-on task test.

Method 2.0 · Published source review Assessed Oct 26, 2026Score ceiling for this evidence: 84/100.

Product usefulness 80

Evidence

The plan table specifies MIDI/MusicXML inputs, collaborative outputs, offline access, paid exports and scanning-credit limits, with account/cancellation controls. This supports80 for notation collaboration.

Limits: AI review of saved source passages. No hands-on test, human approval or automatic-provider checker receipt.

Source links and check dates are in Sources and checks below.

Separate website checks

These checks do not add points to the SI Score. They inspect the website's HTML, not the product in use.

Basic website checksunknown

No check recorded.

HTML accessibility checksunknown

No check recorded.

Homepage HTML responseunknown

No check recorded.

Trackers in homepage HTMLunknown

No check recorded.

Page date hintsunknown

No check recorded.

Policy links do not verify a company's conduct. An HTML response time is not application speed. Tracker and accessibility checks miss behavior after page load. Copyright dates do not prove product upkeep.

How the SI Score works →

Site facts

Pricing: Freemium AI reading, not confirmed
Free plan: Yes AI reading, not confirmed
Sign-up required: Not checked yet.
Platforms: Web App, Windows, Mac AI reading, not confirmed
API: Not checked yet.
Open source: Not checked yet.
HTTPS connection: Yes
Last checked: Oct 27, 2026 · online
Listed since: Oct 27, 2026

Unconfirmed details may be unassessed, absent from the pages checked or temporarily unreadable. A missing price does not mean the service is free.

Sources and checks

Supporting pages for product usefulness, site facts, prices and separate website checks. Each record keeps its own date. Reading a page does not establish how well the product performs in use.

flat.io/pricing
- PricingAI reading, not confirmedChecked Oct 26, 2026
  The official table distinguishes free Basic from recurring Power plans.
- Free planAI reading, not confirmedChecked Oct 26, 2026
  Basic explicitly includes15 scores and listed notation/collaboration features for free.
- Product usefulness evidenceChecked Oct 26, 2026
flat.io/
- PlatformsAI reading, not confirmedChecked Oct 26, 2026
  The official homepage explicitly lists web notation and Windows/Mac desktop apps.
- Product usefulness evidenceChecked Oct 26, 2026

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