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Letterbox

Letters shaped by text. Pick a font, choose your colors, and watch type come alive.

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

Own this Launch?
Screenshot of Letterbox

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 10 April 2026; the live site may have changed since.

Letterbox ships with the basics, with a thorough launch checklist. Main gaps: missing several security headers, incomplete legal pages, and no robots.txt.

Launched on Product Hunt on April 7, 2026. The site is hosted on Vercel. We've detected 8 technologies on this site, covering analytics, CSS frameworks, DNS providers, and web fonts. The stack includes Next.js, React, and Tailwind CSS.

It's on one of the most common stacks we track, shared by 10,672 launches.

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

4.1
StackScope Score
Fair
88/100 Launch Readiness
Launch ready
1/6 Security Headers
Poor
0/3 Legal
Missing
1/2 Crawl files
Partial
Vibe Score 20 · 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 (8)

Infrastructure
DNS Vercel DNS
Hosting Vercel (2)
Security HSTS (2)
Build & Framework
CSS framework Tailwind CSS
Font Google Fonts
Framework React
Meta-framework Next.js (4)
Analytics & Marketing
Analytics Vercel Analytics

Infrastructure

Network
AMAZON-02 - Amazon.com, Inc., US
AS16509 · US
DNS
Vercel DNS
Authoritative nameserver
DNSSEC
Not enabled
DNS responses unsigned. Cache-poisoning vulnerable.
SSL Certificate
Let's Encrypt
Valid 3 Apr 2026 to 2 Jul 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
✓ Responsive viewport meta tag
✓ Favicon present
✓ Semantic HTML (nav, main, article)
- Canonical URL declared

Vibe Score Breakdown How?

SignalPoints
AI writing signals +5
AI typography signals +15

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
Content-Signal
? No directive declared
Link headers
? None advertised

Well-Known Files

✗ robots.txt
✓ sitemap.xml (2 URLs)
✗ security.txt
✗ llms.txt
✗ ads.txt
✗ humans.txt

Legal

? Privacy Policy not detected
? Terms of Service not detected
? Analytics present, but it set no tracking cookies on our visit (it may be opt-in-gated).
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

340ms response time
Faster than 51% of sites
2 third-party domains loaded

Build

✓ Code splitting
10 JS files
3 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.