What technology does stackedit.io use?

stackedit.io is built with Express, Node.js, jQuery.

Is stackedit.io secure (HTTPS)?

Yes. stackedit.io uses TLS 1.3 with a certificate issued by Let's Encrypt, valid until Nov 18, 2026.

Who hosts stackedit.io?

Hosting provider information for stackedit.io is not available yet.

What is stackedit.io's SEO score?

stackedit.io scored 70/100 for SEO in the latest analysis (fair).

What is stackedit.io's overall website score?

stackedit.io has an overall SiteGraph score of 77/100, combining SEO, performance, security, and accessibility.

stackedit.io

StackEdit – In-browser Markdown editor

Last scanned Aug 24, 2026, 1:22 PM · 2 views

Overall score

Fair

Summary

Full-featured, open-source Markdown editor based on PageDown, the Markdown library used by Stack Overflow and the other Stack Exchange sites. This website uses Express. SEO is fair (70/100) and accessibility is fair (60/100). Security scores good (75/100) and performance excellent (100/100). Top issue: Multiple H1 headings found.

Full-featured, open-source Markdown editor based on PageDown, the Markdown library used by Stack Overflow and the other Stack Exchange sites.

Top issues to fix

11 issues found · 2 high priority

Missing Content-Security-Policy header
Security
Add a CSP to control which sources can run scripts — the strongest single defense against XSS.
Over half of images are missing alt text
Accessibility
Add alt attributes to images — screen readers depend on them, and they help image SEO.
Missing X-Content-Type-Options header
Security
Add X-Content-Type-Options: nosniff to stop MIME-sniffing attacks.
Missing X-Frame-Options header
Security
Add X-Frame-Options (or a CSP frame-ancestors rule) to prevent clickjacking via hidden iframes.
Multiple H1 headings found
SEO
Keep a single H1 per page and demote the others to H2/H3.
No structured data (JSON-LD) found
SEO
Add JSON-LD (Organization, Article, Product…) to become eligible for rich results.

+5 more issues — details in the sections below.

SEO

5 issue(s) found

100

Performance

257 ms

Security

HTTPS & header checks

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.

Full-featured, open-source Markdown editor based on PageDown, the Markdown library used by Stack Overflow and the other Stack Exchange sites.

X (Twitter)X (Twitter)

Meta tags

Title: StackEdit – In-browser Markdown editor
Description: Full-featured, open-source Markdown editor based on PageDown, the Markdown library used by Stack Overflow and the other Stack Exchange sites.
Canonical: https://stackedit.io/
Language
Charset: UTF-8
Viewport: user-scalable=no, width=device-width, initial-scale=1, maximum-scale=1
Robots meta
Manifest

Technologies

Detected frameworks, languages, and tools.

Express Node.js jQuery

Hosting & CDN

Hosting provider: —
CDN provider: —
IP address: —
ASN: —

DNS records

Type	Value
A	—
AAAA	—
MX	—
TXT	—
NS	—
CAA	—
CNAME	—
IPv6 support	No

TLS / SSL certificate

Version: TLS 1.3
Issuer: Let's Encrypt
Subject: stackedit.io
Valid from: Aug 20, 2026
Valid to: Nov 18, 2026
Days until expiry: 84
SAN domains: stackedit.io

Security headers

Strict-Transport-SecurityEnabled
Content-Security-PolicyMissing
X-Frame-OptionsMissing
X-Content-Type-OptionsMissing
Referrer-PolicyMissing
Permissions-PolicyMissing

Compression: gzip · 0 cookie(s) observed

Content & assets

Headings

H1 3 · H2 0 · H3 13

Links

2 internal · 5 external · 2 broken

Images

12 total · 12 missing alt

Scripts / Styles

2 scripts · 1 stylesheets

JS / CSS size

133 B · 5.4 KB

Page size

20.8 KB

Robots.txt & Sitemap

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

SEO issues

Multiple H1 headings found
No structured data (JSON-LD) found
Missing OpenGraph tags
robots.txt not found
sitemap.xml not found

Scan details

Requested URL: https://stackedit.io
Final URL: https://stackedit.io
HTTP status: 200
HTTP version: HTTP/2
Response time: 257 ms
HTML size: 20.8 KB
Redirect chain: https://stackedit.io

See something wrong on this report? Request a correction

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Frequently asked questions

What technology does stackedit.io use?: stackedit.io is built with Express, Node.js, jQuery.
Is stackedit.io secure (HTTPS)?: Yes. stackedit.io uses TLS 1.3 with a certificate issued by Let's Encrypt, valid until Nov 18, 2026.
Who hosts stackedit.io?: Hosting provider information for stackedit.io is not available yet.
What is stackedit.io's SEO score?: stackedit.io scored 70/100 for SEO in the latest analysis (fair).
What is stackedit.io's overall website score?: stackedit.io has an overall SiteGraph score of 77/100, combining SEO, performance, security, and accessibility.