Extend UI
File viewers for PDF, DOCX, XLSX, and CSV, with bounding box citations, file upload, e-signing, and more.
Estimated origin: United States
StackScope records what new websites are built with, the week they launch. Most we find ourselves, by watching public internet infrastructure for brand-new sites; the rest come from Product Hunt, Hacker News and PeerPush. We crawled this one for its tech stack and scored it for launch readiness: DNS, security headers, SEO basics. This page is what we saw on 10 June 2026; the live site may have changed since.
Every technology below links to its own page: which other new sites launched with it. Vendors and agencies watch those pages with Stackdar and hear about new adopters the week they ship, from £15 a month.
Extend UI has the basics covered well, with complete legal pages, a thorough launch checklist, and clean crawl signals. Visible gaps: missing several security headers and incomplete email security.
Launched on Hacker News on June 10, 2026. The site is hosted on Vercel, with a domain registered in 2017. Our crawler found 8 technologies on this site, covering CSS frameworks, DNS providers, business email, and frameworks. The stack includes Next.js, React, and Tailwind CSS.
It's also on one of the most common stacks we track, shared by 15,005 launches.
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Tech Stack (8)
| DNS |
Cloudflare DNS
|
| Hosting |
Vercel
|
| Security | HSTS |
| Business email |
Google Workspace
(4)
|
| CSS framework |
Tailwind CSS
|
| Framework |
React
|
| Meta-framework |
Next.js
(2)
|
| SEO |
Google Search Console
|
Infrastructure
Email Security
Storage (1)
| Name | Lifetime | Detected as |
|---|---|---|
| gdpr_applies | session | - |
Readiness Breakdown How?
Performance How?
⚠ 26 images: 11 oversized, 24 without width/height, 24 missing alt text
Broken first-party requests (10), worth fixing
- 404 /ui?_rsc=vO2Kyv01KvTU2rhM
- 404 /ui?_rsc=JJ_mMSBlia8g5V4Q
- 404 /ui?_rsc=zZ7aKgXCxxeEeXr0
- 404 /ui?_rsc=7h4NYy5eoyMcNlUN
- 404 /ui/docs?_rsc=5CB68i4pnAekjehf
- 404 /ui?_rsc=yIp22O3xgPPxC28X
- 404 /ui/blocks?_rsc=5CB68i4pnAekjehf
- 404 /ui/docs/components/file-system?_rsc=5CB68i4pnAekjehf
Indicative grade from a single automated render, not a substitute for Lighthouse or field data, and not part of the StackScope score.