Kullback
Kullback is Leibler's open-source harness. It rebuilds your environment from your agent traces and checks the rebuild by replay. The claim it exists to earn: a 2B model post-trained in that environment performs on the real tasks.
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 4 September 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.
Kullback has the basics covered well, with a thorough launch checklist, fast page loads, and clean crawl signals. Worth fixing first: no Content-Security-Policy, incomplete legal pages, and incomplete email security.
Launched on Hacker News on September 4, 2026. The site is hosted on Vercel, with a domain registered 1 week before launch. Our crawler found 5 technologies on this site, covering DNS providers, email forwarding, web fonts, and hosting. The stack includes Cloudflare DNS, Cloudflare Email Routing, and Google Fonts.
It's also running the same core stack as 4,269 other launches and tighter on security headers than most Hacker News launches.
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Tech Stack (5)
| DNS |
Cloudflare DNS
|
| Hosting |
Vercel
|
| Security | HSTS |
| Email forwarding |
Cloudflare Email Routing
(2)
|
| Font |
Google Fonts
|
Infrastructure
Email Security
Storage (0)
Readiness Breakdown How?
Performance How?
⚠ 1 images: 1 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.