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Opensidian: Local-first notes in the browser with POSIX shell and sync

Show HN: Opensidian: Local-first notes in the browser with POSIX shell and sync

69% unique tagline

opensidian.com · Added April 7, 2026 · Last analysed April 10, 2026· via Hacker News

Screenshot of Opensidian: Local-first notes in the browser with POSIX shell and sync
This analysis is a snapshot taken on 10 April 2026. The site may have changed since then and results may not reflect its current state.
4.0
StackScope Score
Fair
10/100 Vibe Score
Few AI signals
25/100 Launch Readiness
Needs work
0/6 Security Headers
Poor
neutral
AI Stance
No AI stance declared

Tech Stack (5)

Infrastructure
Cloudflare http_header_name
Cloudflare DNS ns_host
HTTP/3 http_header_value
Build & Framework
shadcn/ui structural_signal
Tailwind CSS structural_signal

Infrastructure

Hosting
AS13335 · US
SSL Certificate
Google Trust Services
Expires 6 Jul 2026
Domain Age
1 month
Registered Mar 2026 · Cloudflare, Inc.

Readiness Breakdown How?

✓ Responsive viewport meta tag
✓ Semantic HTML (nav, main, article)
- Custom title and meta description
- Open Graph tags (title, image, description)
- Canonical URL declared
- Source maps not exposed in production
- Error tracking service installed
- Privacy policy page present
- Twitter card meta tags
- Favicon present

Vibe Score Breakdown How?

SignalPoints
CSS patterns +10

This score is based on structural patterns and is not definitive. Many legitimate sites may trigger signals, and AI-built sites may go undetected. It should be treated as an indicator, not a verdict.

Well-Known Files

✓ robots.txt
✗ llms.txt
✗ security.txt
✗ sitemap.xml
✗ ads.txt
✗ humans.txt

Legal

? Privacy Policy not detected
? Terms of Service not detected
Detection works best on English language sites.

Security Headers (0/6)

✗ Referrer-Policy
✗ X-Frame-Options
✗ Permissions-Policy
✗ X-Content-Type-Options
✗ Content-Security-Policy
✗ Strict-Transport-Security
– X-XSS-Protection (legacy)

Performance

92ms response time
Faster than 95% of sites
1 third-party domains loaded

Build

✓ HTML minified
0 JS files
1 Third-party domains
Is this your site? 8 tips to improve your score
- Add a sitemap.xml to help search engines discover all your pages. Learn more
- Add a privacy policy. Free generators like Termly or Iubenda can create one in minutes.
- Add a /.well-known/security.txt so security researchers can reach you. Learn more
- Consider adding a llms.txt file to help AI models understand your site. Not yet a standard, but gaining adoption. Learn more
- Improve your security headers. Scan your site at securityheaders.com to see what's missing.
- Add Open Graph tags so your site looks good when shared on social media. Learn more
- Add a <link rel="canonical"> tag to prevent duplicate content issues. Learn more
- Set a custom <title> and <meta name="description">. These are the first things users see in search results. Learn more
Embed this score on your site
StackScope Score 
<a href="https://stackscope.dev/launch/by2grn9d/opensidian-local-first-notes-in-the-browser-with-posix-shell-and-sync"><img src="https://stackscope.dev/badge/by2grn9d.svg" alt="StackScope Score" height="28" /></a>