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SGSiteGraph

draw.io

Flowchart Maker & Online Diagram Software

Last scanned Jul 26, 2026, 5:17 AM · 3 views

77

Overall score

Fair

Summary

draw.io is free online diagram software for making flowcharts, process diagrams, org charts, UML, ER and network diagrams. This website is hosted on Cloudflare. SEO is good (75/100) and accessibility is fair (60/100). Security scores excellent (90/100) and performance good (80/100). Top issue: No structured data (JSON-LD) found.

draw.io is free online diagram software for making flowcharts, process diagrams, org charts, UML, ER and network diagrams

United States
Hosted on Cloudflare

Top issues to fix

8 issues found · 2 high priority

  • Over half of images are missing alt text

    Accessibility

    Add alt attributes to images — screen readers depend on them, and they help image SEO.

  • Slow estimated load (4.2s)

    Performance

    Use a CDN, enable caching/compression, and cut render-blocking assets — every extra second costs conversions.

  • Missing X-Frame-Options header

    Security

    Add X-Frame-Options (or a CSP frame-ancestors rule) to prevent clickjacking via hidden iframes.

  • No structured data (JSON-LD) found

    SEO

    Add JSON-LD (Organization, Article, Product…) to become eligible for rich results.

  • Missing OpenGraph tags

    SEO

    Add og:title/og:description/og:image so shared links render a proper preview card.

  • robots.txt not found

    SEO

    Publish /robots.txt with a Sitemap: directive to guide crawlers.

+2 more issues — details in the sections below.

75

SEO

4 issue(s) found

80

Performance

4.24 s

90

Security

HTTPS & header checks

60

Accessibility

2 issue(s) found

Not enough scan history yet to show a trend — check back after this site has been re-scanned a few more times.

Organization

Company details published in this site's own structured data.

draw.io is free online diagram software for making flowcharts, process diagrams, org charts, UML, ER and network diagrams

Meta tags

Title
Flowchart Maker & Online Diagram Software
Description
draw.io is free online diagram software for making flowcharts, process diagrams, org charts, UML, ER and network diagrams
Canonical
https://app.diagrams.net
Language
Charset
UTF-8
Viewport
width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no
Robots meta
Manifest
https://app.diagrams.net/images/manifest.json

OpenGraph & Twitter Card

OpenGraph

og:title
—
og:description
—
og:type
—
og:url
—

Twitter Card

twitter:card
—
twitter:title
—
twitter:description
—

Technologies

Detected frameworks, languages, and tools.

No technologies detected.

Hosting & CDN

Hosting provider
Cloudflare
CDN provider
Cloudflare
IP address
104.18.4.247
ASN
AS13335 (CLOUDFLARENET - Cloudflare, Inc., US)

DNS records

TypeValue
A
  • 104.18.4.247
  • 104.18.5.247
AAAA
  • 2606:4700::6812:5f7
  • 2606:4700::6812:4f7
MX—
TXT—
NS—
CAA—
CNAME—
IPv6 supportYes

TLS / SSL certificate

Version
TLS 1.3
Issuer
Let's Encrypt
Subject
diagrams.net
Valid from
Jun 7, 2026
Valid to
Sep 5, 2026
Days until expiry
41
SAN domains
*.diagrams.net, diagrams.net

Security headers

  • Strict-Transport-SecurityEnabled
  • Content-Security-PolicyEnabled
  • X-Frame-OptionsMissing
  • X-Content-Type-OptionsEnabled
  • Referrer-PolicyEnabled
  • Permissions-PolicyEnabled

Compression: gzip · 0 cookie(s) observed

Content & assets

Headings

H1 1 · H2 1 · H3 0

Links

0 internal · 0 external · 0 broken

Images

1 total · 1 missing alt

Scripts / Styles

2 scripts · 2 stylesheets

JS / CSS size

0 B · 223 B

Page size

2.7 KB

Robots.txt & Sitemap

robots.txt
Not found
Disallow rules
0
sitemap.xml
Not found
URLs in sitemap
0

SEO issues

  • No structured data (JSON-LD) found
  • Missing OpenGraph tags
  • robots.txt not found
  • sitemap.xml not found

Accessibility issues

  • Over half of images are missing alt text
  • Missing <html lang> attribute

Scan details

Requested URL
https://draw.io
Final URL
https://app.diagrams.net/
HTTP status
200
HTTP version
HTTP/2
Response time
4.24 s
HTML size
2.7 KB
Redirect chain
https://draw.io → https://app.diagrams.net/

See something wrong on this report? Request a correction

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Frequently asked questions

What technology does draw.io use?
We did not detect any specific technologies for draw.io in the latest scan.
Is draw.io secure (HTTPS)?
Yes. draw.io uses TLS 1.3 with a certificate issued by Let's Encrypt, valid until Sep 5, 2026.
Who hosts draw.io?
draw.io is hosted on Cloudflare, behind Cloudflare CDN.
What is draw.io's SEO score?
draw.io scored 75/100 for SEO in the latest analysis (fair).
What is draw.io's overall website score?
draw.io has an overall SiteGraph score of 77/100, combining SEO, performance, security, and accessibility.