flat.io
Music Notation Software for Web, Desktop & Mobile – Flat
Last scanned Jul 26, 2026, 5:47 AM
Overall score
Excellent
Summary
Flat is intuitive music notation software for Mac, Windows, web, iOS & Android. This website uses Nuxt hosted on DigitalOcean behind Cloudflare CDN. SEO is excellent (95/100) and accessibility is excellent (100/100). Security scores excellent (90/100) and performance excellent (100/100). Top issue: Missing OpenGraph tags.
Flat is intuitive music notation software for Mac, Windows, web, iOS & Android. Compose, collaborate, play & print sheet music from any device.
- United States
- Hosted on DigitalOcean
Top issues to fix
3 issues found · 1 high priority
Missing Content-Security-Policy header
SecurityAdd a CSP to control which sources can run scripts — the strongest single defense against XSS.
Missing OpenGraph tags
SEOAdd og:title/og:description/og:image so shared links render a proper preview card.
1 broken link on the page
SEOFix or remove broken links — they waste crawl budget and erode user trust.
SEO
1 issue(s) found
Performance
181 ms
Security
HTTPS & header checks
Accessibility
0 issue(s) found
Organization
Company details published in this site's own structured data.
Flat is intuitive music notation software for Mac, Windows, web, iOS & Android. Compose, collaborate, play & print sheet music from any device.
Contact
Email, phone, and address published on this site's own pages.
Source: https://flat.io/contact
Meta tags
- Title
- Music Notation Software for Web, Desktop & Mobile – Flat
- Description
- Flat is intuitive music notation software for Mac, Windows, web, iOS & Android. Compose, collaborate, play & print sheet music from any device.
- Canonical
- https://flat.io
- Language
- en-US
- Charset
- utf-8
- Viewport
- width=device-width, initial-scale=1
- Robots meta
- Manifest
- https://flat.io/manifest.json
Technologies
Detected frameworks, languages, and tools.
Hosting & CDN
- Hosting provider
- DigitalOcean
- CDN provider
- Cloudflare
- IP address
- 24.144.78.233
- ASN
- AS14061 (DIGITALOCEAN-ASN - DigitalOcean, LLC, US)
DNS records
| Type | Value |
|---|---|
| A |
|
| AAAA |
|
| MX |
|
| TXT | — |
| NS |
|
| CAA | — |
| CNAME | — |
| IPv6 support | Yes |
TLS / SSL certificate
- Version
- TLS 1.3
- Issuer
- Sectigo Limited
- Subject
- *.flat.io
- Valid from
- Sep 1, 2025
- Valid to
- Oct 2, 2026
- Days until expiry
- 68
- SAN domains
- *.flat.io, flat.io
Security headers
- Strict-Transport-SecurityEnabled
- Content-Security-PolicyMissing
- X-Frame-OptionsEnabled
- X-Content-Type-OptionsEnabled
- Referrer-PolicyEnabled
- Permissions-PolicyMissing
Compression: gzip · 0 cookie(s) observed
Content & assets
Headings
H1 1 · H2 8 · H3 24
Links
27 internal · 21 external · 1 broken
Images
46 total · 0 missing alt
Scripts / Styles
4 scripts · 6 stylesheets
JS / CSS size
533 KB · 151 KB
Page size
153 KB
Robots.txt & Sitemap
- robots.txt
- Found
- Disallow rules
- 4
- sitemap.xml
- Found
- URLs in sitemap
- -1
SEO issues
- Missing OpenGraph tags
Accessibility issues
No accessibility issues detected.
Scan details
- Requested URL
- https://flat.io
- Final URL
- https://flat.io
- HTTP status
- 200
- HTTP version
- HTTP/2
- Response time
- 178 ms
- HTML size
- 153 KB
- Redirect chain
- https://flat.io
See something wrong on this report? Request a correction
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Frequently asked questions
- What technology does flat.io use?
- flat.io is built with Vue.js, Nuxt, Nginx.
- Is flat.io secure (HTTPS)?
- Yes. flat.io uses TLS 1.3 with a certificate issued by Sectigo Limited, valid until Oct 2, 2026.
- Who hosts flat.io?
- flat.io is hosted on DigitalOcean, behind Cloudflare CDN.
- What is flat.io's SEO score?
- flat.io scored 95/100 for SEO in the latest analysis (excellent).
- What is flat.io's overall website score?
- flat.io has an overall SiteGraph score of 96/100, combining SEO, performance, security, and accessibility.
OpenGraph & Twitter Card
OpenGraph
Twitter Card