Play Harmonium
Play Web Harmonium online in your browser with keyboard shortcuts, touch controls, Sargam labels, octave switching, transpose, and beginner-friendly guides.
Added April 4, 2026
· Last analysed April 10, 2026 · via 
· 75% unique tagline
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 10 April 2026; the live site may have changed since.
Play Harmonium is largely in shape, with complete legal pages, a thorough launch checklist, and clean crawl signals. Main gaps: missing several security headers, tracking cookies set before any opt-in, and incomplete email security.
Launched on Product Hunt on April 4, 2026. The site is hosted on Vercel and served through Cloudflare, with a domain registered 5 days before launch. The crawl picked up 12 technologies on this site, covering analytics, CDN, CSS frameworks, and DNS providers. The stack includes Next.js, React, and Tailwind CSS.
For context, it's on one of the most common stacks we track, shared by 10,677 launches.
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Tech Stack (12)
| CDN |
Cloudflare
|
| DNS |
Cloudflare DNS
|
| Hosting |
Vercel
(2)
|
| Security | HSTS (2) |
| Email forwarding |
Cloudflare Email Routing
(2)
|
| CSS framework |
Tailwind CSS
|
| Framework |
React
|
| Meta-framework |
Next.js
(6)
|
| UI library |
shadcn/ui
|
| Analytics |
Google Analytics
(3)
|
| SEO |
Google Search Console
(2)
|
| Tag management |
Google Tag Manager
|
Infrastructure
Email Security
Readiness Breakdown How?
Vibe Score Breakdown How?
| Signal | Points |
|---|---|
| AI CSS signals | +10 |
| AI palette signals | +5 |
| AI stack signals | +10 |
| 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.