Clef
Clef is a piano practice app that puts real sheet music on screen, hears every note over MIDI, and re-tests each bar from memory with spaced repetition.
StackScope is a free public catalogue of indie launches. We find launches on Product Hunt, Hacker News and similar feeds, then crawl each site to detect its tech stack and score it for launch readiness: DNS, security headers, SEO basics. This page is what we saw on 7 August 2026; the live site may have changed since.
Clef scores highly overall, with complete legal pages, a thorough launch checklist, and fast page loads. Visible gaps: missing several security headers and incomplete email security.
Launched on Hacker News on August 7, 2026. The site is served through Cloudflare, with a domain registered 6 weeks before launch. We've detected 8 technologies on this site, covering analytics, CDN, DNS providers, and email forwarding. The stack includes Astro, Cloudflare, and Cloudflare DNS.
It's on one of the most common stacks we track, shared by 393 launches.
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Tech Stack (8)
| CDN |
Cloudflare
(2)
|
| DNS |
Cloudflare DNS
|
| Protocol | HTTP/3 |
| Email forwarding |
Cloudflare Email Routing
(2)
|
| Transactional email |
Resend
|
| Meta-framework |
Astro
|
| Analytics |
Cloudflare Web Analytics
(2)
|
| SEO |
Google Search Console
|
Infrastructure
Email Security
Storage (1)
| Name | Lifetime | Detected as |
|---|---|---|
| cf_clearance | 1y | Cloudflare |
Readiness Breakdown How?
Performance How?
⚠ 8 images: 3 oversized, 1 missing alt text
Indicative grade from a single automated render, not a substitute for Lighthouse or field data, and not part of the StackScope score.
Vibe Score Breakdown How?
| Signal | Points |
|---|---|
| AI copy signals | +5 |
| AI onboarding signals | +5 |
| AI palette signals | +5 |
| AI writing signals | +3 |
| AI layout signals | +5 |
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.