returnzero.dev
System design breakdowns, coding questions, and live coding challenges. The kind of prep that actually moves the needle.
Estimated origin: United Kingdom
Added July 30, 2026
· Last analysed July 30, 2026 · via 
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 30 July 2026; the live site may have changed since.
returnzero.dev scores highly overall, with complete legal pages, a complete set of security headers, and a thorough launch checklist. Visible gaps: incomplete email security.
Launched on Product Hunt on July 30, 2026. The site is hosted on Vercel, with a domain registered 11 weeks before launch. Our crawler found 16 technologies on this site, covering analytics, auth, CSS frameworks, and DNS providers. The stack includes Auth.js, Next.js, and React.
It's also on one of the most common stacks we track, shared by 11,926 launches and more locked down than the typical Product Hunt launch.
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Tech Stack (16)
| DNS |
Vercel DNS
|
| Hosting |
Vercel
(2)
|
| Image CDN |
Google User Content
|
| Security | HSTS |
| Email forwarding |
ImprovMX
(2)
|
| Auth |
Auth.js
|
| CSS framework |
Tailwind CSS
|
| Framework |
React
|
| JavaScript library |
Excalidraw
|
| Meta-framework |
Next.js
(5)
|
| Package CDN |
esm.sh
|
| UI library |
Lucide Icons
|
| Video |
YouTube
|
| Analytics |
Vercel Analytics
medium
|
| Payments |
Stripe
|
| Error tracking |
Sentry
|
Infrastructure
Email Security
Storage (3)
| Name | Lifetime | Detected as |
|---|---|---|
| __Host-authjs.csrf-token | session | Auth.js |
| __Secure-authjs.callback-url | session | Auth.js |
| Key | Size | Detected as |
|---|---|---|
| returnzero:theme | 5 B | - |
Readiness Breakdown How?
Performance How?
⚠ 18 images: 15 oversized, 15 without width/height
Broken first-party requests (2), worth fixing
- 404 /companies/figma?_rsc=5CB68i4pnAekjehf
- 404 /companies/datadog?_rsc=5CB68i4pnAekjehf
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 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.