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Family sync with no server

How ReceiptIQ shares one subscription across 4 family devices with zero backend: StoreKit JWS verification against Apple's root CA, QR pairing that a screenshot can't steal, LWW sync invariants, and the MultipeerConnectivity bugs that shipped.

Developer Tools

Added August 26, 2026 · Last analysed August 26, 2026 · via Hacker News

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 26 August 2026; the live site may have changed since.

Family sync with no server is largely in shape, with complete legal pages and clean crawl signals. Visible gaps: missing several security headers, tracking cookies set before any opt-in, and incomplete email security.

Launched on Hacker News on August 26, 2026. The site is served through Cloudflare. The crawl picked up 11 technologies on this site, covering analytics, seo, CDN, and DNS providers. The stack includes Apple Business Connect, Apple Domain Verification, and cdnjs.

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

Vibe Score 10 · Few 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 (11)

Infrastructure
CDN Cloudflare (2)
DNS Cloudflare DNS
Email
Email forwarding Cloudflare Email Routing (2)
Build & Framework
Icon font Font Awesome
Package CDN cdnjs

Infrastructure

Network
AS13335 · US
DNS
Cloudflare DNS
Authoritative nameserver
DNSSEC
Not enabled
DNS responses unsigned. Cache-poisoning vulnerable.
Green hosting
Green hosted
Host runs on renewable energy. Data from The Green Web Foundation.
SSL Certificate
Google Trust Services
Valid 18 Jul 2026 to 16 Oct 2026
Certificate as captured in this snapshot, not a live check.

Email Security

SPF ~all Soft-fail (~all). Common and accepted.
?
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.

Storage (2)

Cookies (2)
NameLifetimeDetected as
_ga 1y Google Analytics
_ga_X70V9SS00J 1y Google Analytics

Readiness Breakdown How?

Custom title and meta description
Canonical URL declared
Responsive viewport meta tag
Favicon present
Semantic HTML (nav, main, article)
Page title is 91 characters (advisory) Google only shows about 60 characters of the title in search results; aim for 50–60 to keep the whole thing visible.
Meta description is 243 characters (advisory) Google only shows about 155–160 characters of the description in desktop search results (less on mobile); anything past that won't appear.
- Open Graph tags (title, image, description)
- Twitter card meta tags

Performance How?

182 ms Server response
70% Faster than peers
632 ms Largest contentful paint
0.00 Cumulative layout shift
1.8 MB Page weight
1.4 MB Image weight
4 Third-party domains
0 Console errors
0 Failed requests

2 images: 1 oversized, 1 without width/height

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?

SignalPoints
AI palette signals +5
AI writing 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.

AI Stance

No AI stance declared
llms.txt published
No AI bots blocked in robots.txt
? No directive declared
? None advertised

Well-Known Files

robots.txt
sitemap.xml (65 URLs)
security.txt
llms.txt
ads.txt
humans.txt
Privacy Policy
/privacy.html
Terms of Service
/terms.html
? Consent manager not detected
Analytics set tracking cookies on our visit, with no opt-in step.
92% unique

Security Headers (2/6)

Permissions-Policy experimental (check browser support)
X-XSS-Protection deprecated (use Content-Security-Policy)

Build

3 JS files
7 CSS files
4 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.