Rac-delta

rac-delta is an universal differential protocol designed to sync and distribute builds (like games, apps or directories) efficiently and storage agnostic.

Developer Tools

Added April 7, 2026 · Last analysed April 10, 2026 · via Hacker News

Own this Launch?

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 April 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.

Rac-delta is missing several launch fundamentals. Visible gaps: missing several security headers, incomplete legal pages, and no robots.txt or sitemap.

Launched on Hacker News on April 7, 2026. The site is hosted on GitHub Pages and served through Fastly. Our crawler found 5 technologies on this site, covering CDN, hosting, meta-frameworks, and search. The stack includes Docusaurus, Algolia, and Fastly.

It's also one of 33 launches on this exact stack.

If you own this site, refresh the snapshot and see the full fix list any time →

3.3

StackScope Score

Poor

100/100 Launch Readiness

Launch ready

1/6 Security Headers

Poor

0/3 Legal

Missing

0/2 Crawl files

Missing

Vibe Score 0 · No AI signals

How much the site looks AI-generated. Informational pattern-match signal, not a verdict. Does not feed the StackScope Score. See which fingerprints fired →

Tech Stack (5)

Infrastructure

CDN	Fastly (2)
Hosting	GitHub Pages (2)
Security	HSTS (2)

Build & Framework

Meta-framework	Docusaurus (2)

Business Tools

Search	Algolia

Infrastructure

Network

FASTLY - Fastly, Inc., US

AS54113 · US

DNSSEC

Not enabled

DNS responses unsigned. Cache-poisoning vulnerable.

Green hosting

Not green hosted

No green-energy record. Data from The Green Web Foundation.

SSL Certificate

Let's Encrypt

Valid 6 Feb 2026 to 7 May 2026

Certificate as captured in this snapshot, not a live check.

Email Security

✗

SPF Not published. Your domain can be spoofed in phishing emails.

DKIM Not detected at common selectors. Your provider may use a custom one.

✗

DMARC Not published. Receivers fall back to permissive defaults.

MTA-STS Not deployed. Mail to your domain can be downgraded to plaintext en route.

TLS-RPT Not configured. You won't hear about silent SMTP TLS handshake failures.

Readiness Breakdown How?

✓ Custom title and meta description

✓ Open Graph tags (title, image, description)

✓ Twitter card meta tags

✓ Canonical URL declared

✓ Responsive viewport meta tag

✓ Favicon present

✓ Semantic HTML (nav, main, article)

AI Stance

No AI stance declared

✗ llms.txt published

✓ No AI bots blocked in robots.txt

Content-Signal

? No directive declared

Link headers

? None advertised

Well-Known Files

✗ robots.txt

✗ sitemap.xml

✗ security.txt

✗ llms.txt

✗ ads.txt

✗ humans.txt

Legal

? Privacy Policy not detected

? Terms of Service not detected

Detection works best on English language sites.

Security Headers (1/6)

✗

Referrer-Policy

✗

X-Frame-Options

✗

Permissions-Policy experimental (check browser support)

✗

X-Content-Type-Options

✗

Content-Security-Policy

✓

Strict-Transport-Security

–

X-XSS-Protection deprecated (use Content-Security-Policy)

Performance

175ms response time

Faster than 69% of sites

2 third-party domains loaded

Build

2 JS files

1 CSS files

2 Third-party domains

Brand Colours

Something not look right? If a technology shown here is wrong or out of date, email [email protected] and we'll review it.