mermaid.live
Online FlowChart & Diagrams Editor - Mermaid Live Editor
Last scanned Jul 27, 2026, 8:44 AM · 1 view
Overall score
Fair
Summary
Simplify documentation and avoid heavy tools. This website uses Svelte hosted on Fastly behind Fastly CDN. SEO is fair (65/100) and accessibility is excellent (90/100). Security scores fair (65/100) and performance excellent (90/100). Top issue: Meta description longer than 160 characters.
Simplify documentation and avoid heavy tools. Open source Visio Alternative. Commonly used for explaining your code! Mermaid is a simple markdown-like script language for generating charts from text via javascript.
- United States
- Hosted on Fastly
Top issues to fix
9 issues found · 3 high priority
Missing Strict-Transport-Security header
SecurityAdd HSTS so browsers always use HTTPS — this closes the protocol-downgrade attack window.
Missing Content-Security-Policy header
SecurityAdd a CSP to control which sources can run scripts — the strongest single defense against XSS.
No H1 heading found
SEOAdd exactly one H1 describing the page's main topic — it anchors the document outline for search engines and screen readers.
Missing X-Content-Type-Options header
SecurityAdd X-Content-Type-Options: nosniff to stop MIME-sniffing attacks.
Missing X-Frame-Options header
SecurityAdd X-Frame-Options (or a CSP frame-ancestors rule) to prevent clickjacking via hidden iframes.
Meta description longer than 160 characters
SEOTrim the meta description to under 160 characters to avoid truncation in search results.
+3 more issues — details in the sections below.
SEO
5 issue(s) found
Performance
3 ms
Security
HTTPS & header checks
Accessibility
1 issue(s) found
Organization
Company details published in this site's own structured data.
Simplify documentation and avoid heavy tools. Open source Visio Alternative. Commonly used for explaining your code! Mermaid is a simple markdown-like script language for generating charts from text via javascript.
Meta tags
- Title
- Online FlowChart & Diagrams Editor - Mermaid Live Editor
- Description
- Simplify documentation and avoid heavy tools. Open source Visio Alternative. Commonly used for explaining your code! Mermaid is a simple markdown-like script language for generating charts from text via javascript.
- Canonical
- Language
- en
- Charset
- utf-8
- Viewport
- width=device-width, initial-scale=1
- Robots meta
- Manifest
- https://mermaid.live/manifest.json
Technologies
Detected frameworks, languages, and tools.
Hosting & CDN
DNS records
| Type | Value |
|---|---|
| A |
|
| AAAA |
|
| MX |
|
| TXT |
|
| NS |
|
| CAA | — |
| CNAME | — |
| IPv6 support | Yes |
TLS / SSL certificate
- Version
- TLS 1.3
- Issuer
- Let's Encrypt
- Subject
- mermaid.live
- Valid from
- Jul 10, 2026
- Valid to
- Oct 8, 2026
- Days until expiry
- 73
- SAN domains
- mermaid.live, www.mermaid.live
Security headers
- Strict-Transport-SecurityMissing
- Content-Security-PolicyMissing
- X-Frame-OptionsMissing
- X-Content-Type-OptionsMissing
- Referrer-PolicyMissing
- Permissions-PolicyMissing
Compression: gzip · 0 cookie(s) observed
Content & assets
Headings
H1 0 · H2 0 · H3 0
Links
2 internal · 5 external · 0 broken
Images
3 total · 0 missing alt
Scripts / Styles
2 scripts · 5 stylesheets
JS / CSS size
1.3 KB · 422 KB
Page size
3.5 KB
Robots.txt & Sitemap
- robots.txt
- Found
- Disallow rules
- 0
- sitemap.xml
- Found
- URLs in sitemap
- 1
SEO issues
- Meta description longer than 160 characters
- Missing canonical link
- No H1 heading found
- No structured data (JSON-LD) found
- Missing OpenGraph tags
Accessibility issues
- No H1 heading found
Scan details
- Requested URL
- https://mermaid.live
- Final URL
- https://mermaid.live
- HTTP status
- 200
- HTTP version
- HTTP/2
- Response time
- 3 ms
- HTML size
- 3.5 KB
- Redirect chain
- https://mermaid.live
See something wrong on this report? Request a correction
Related websites
Same technology stack
surveyplanet.com
Free Online Survey Maker | Unlimited Surveys | Surveyplanet
hivemq.com
HiveMQ | The Real-Time Industrial Data Platform Powering Agentic AI, Built on MQTT
mullvad.net
Mullvad VPN - Privacy is for the people
logitech.com
Logitech India
logi.com
Logitech India
meteocity.com
Prévisions météo aujourd'hui, demain, 15 jours, France et monde
Same hosting provider
foresee.com
Predictive Analytics for Customer Experience | Verint
voicemod.net
Free Real Time Voice Changer for PC & Mac | Voicemod
researchandmarkets.com
Research and Markets - Market Research Reports - Welcome
hallensteins.co.nz
Hallensteins | Menswear NZ
pin.se
InfraCom — komplett digital helhetsleverantör
karafun.com
Online Karaoke with a wide selection of songs on KaraFun
Frequently asked questions
- What technology does mermaid.live use?
- mermaid.live is built with Svelte.
- Is mermaid.live secure (HTTPS)?
- Yes. mermaid.live uses TLS 1.3 with a certificate issued by Let's Encrypt, valid until Oct 8, 2026.
- Who hosts mermaid.live?
- mermaid.live is hosted on Fastly, behind Fastly CDN.
- What is mermaid.live's SEO score?
- mermaid.live scored 65/100 for SEO in the latest analysis (fair).
- What is mermaid.live's overall website score?
- mermaid.live has an overall SiteGraph score of 76/100, combining SEO, performance, security, and accessibility.
OpenGraph & Twitter Card
OpenGraph
Twitter Card