hackmd.io
HackMD: Your Collaborative Markdown Workspace for Knowledge Sharing
Last scanned Jul 25, 2026, 2:25 AM · 2 views
Overall score
Excellent
Summary
A collaborative Markdown editor for you and your team to create, share, and edit documents in real-time. This website uses Next.js hosted on AWS. SEO is excellent (90/100) and accessibility is excellent (100/100). Security scores excellent (90/100) and performance excellent (100/100). Top issue: Title longer than 60 characters.
HackMD
A collaborative Markdown editor for you and your team to create, share, and edit documents in real-time. Sign up for free today.
- United States
- Hosted on AWS
Products & pricing
Product and pricing information published in this site's own structured data.
For Team
$15 USD
Top issues to fix
5 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.
3 cookies without Secure/HttpOnly flags
SecuritySet Secure and HttpOnly on session cookies so they can't leak over HTTP or be read by injected scripts.
Title longer than 60 characters
SEOShorten the title to under 60 characters so search results don't truncate it.
Multiple H1 headings found
SEOKeep a single H1 per page and demote the others to H2/H3.
2 broken links on the page
SEOFix or remove broken links — they waste crawl budget and erode user trust.
SEO
2 issue(s) found
Performance
195 ms
Security
HTTPS & header checks
Accessibility
0 issue(s) found
Organization
Company details published in this site's own structured data.
HackMD
A collaborative Markdown editor for you and your team to create, share, and edit documents in real-time. Sign up for free today.
Contact
Email, phone, and address published on this site's own pages.
Meta tags
- Title
- HackMD: Your Collaborative Markdown Workspace for Knowledge Sharing
- Description
- HackMD gives you a real-time Markdown editor for collaborative work. Working with Markdown files in HackMD is simple, straightforward, and fun.
- Canonical
- https://hackmd.io
- Language
- en
- Charset
- utf-8
- Viewport
- width=device-width, initial-scale=1
- Robots meta
- Manifest
Technologies
Detected frameworks, languages, and tools.
Hosting & CDN
- Hosting provider
- AWS
- CDN provider
- —
- IP address
- 99.83.179.177
- ASN
- AS16509 (AMAZON-02 - Amazon.com, Inc., US)
DNS records
| Type | Value |
|---|---|
| A |
|
| AAAA |
|
| MX |
|
| TXT | — |
| NS |
|
| CAA |
|
| CNAME | — |
| IPv6 support | Yes |
TLS / SSL certificate
- Version
- TLS 1.2
- Issuer
- Amazon
- Subject
- hackmd.io
- Valid from
- Jan 5, 2026
- Valid to
- Feb 2, 2027
- Days until expiry
- 192
- SAN domains
- hackmd.io, *.hackmd.io
Security headers
- Strict-Transport-SecurityEnabled
- Content-Security-PolicyMissing
- X-Frame-OptionsEnabled
- X-Content-Type-OptionsEnabled
- Referrer-PolicyEnabled
- Permissions-PolicyMissing
Compression: gzip · 4 cookie(s) observed
Content & assets
Headings
H1 3 · H2 4 · H3 1
Links
37 internal · 6 external · 2 broken
Images
68 total · 0 missing alt
Scripts / Styles
34 scripts · 3 stylesheets
JS / CSS size
108 KB · 0 B
Page size
211 KB
Robots.txt & Sitemap
- robots.txt
- Found
- Disallow rules
- 13
- sitemap.xml
- Found
- URLs in sitemap
- -1
SEO issues
- Title longer than 60 characters
- Multiple H1 headings found
Accessibility issues
No accessibility issues detected.
Scan details
- Requested URL
- https://hackmd.io
- Final URL
- https://hackmd.io
- HTTP status
- 200
- HTTP version
- HTTP/2
- Response time
- 191 ms
- HTML size
- 211 KB
- Redirect chain
- https://hackmd.io
See something wrong on this report? Request a correction
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Frequently asked questions
- What technology does hackmd.io use?
- hackmd.io is built with Next.js.
- Is hackmd.io secure (HTTPS)?
- Yes. hackmd.io uses TLS 1.2 with a certificate issued by Amazon, valid until Feb 2, 2027.
- Who hosts hackmd.io?
- hackmd.io is hosted on AWS.
- What is hackmd.io's SEO score?
- hackmd.io scored 90/100 for SEO in the latest analysis (excellent).
- What is hackmd.io's overall website score?
- hackmd.io has an overall SiteGraph score of 95/100, combining SEO, performance, security, and accessibility.
- What company operates hackmd.io?
- hackmd.io is operated by HackMD. A collaborative Markdown editor for you and your team to create, share, and edit documents in real-time. Sign up for free today.
- What products does hackmd.io offer?
- hackmd.io offers For Team.
OpenGraph & Twitter Card
OpenGraph
Twitter Card