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Tessera

See your web app on phones, tablets, and desktops at once — live, synced viewports at true size and DPR. Capture evidence, share mosaics, or run tessera check for agent-friendly overflow findings.

Developer Tools
United Kingdom Estimated origin: United Kingdom

Added July 19, 2026 · Last analysed July 19, 2026 · via · 78% unique tagline

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 19 July 2026; the live site may have changed since.

Tessera scores highly overall, with complete legal pages, a thorough launch checklist, and clean crawl signals. Visible gaps: no Content-Security-Policy and incomplete email security.

Launched on Product Hunt on July 19, 2026. The site is hosted on Railway and served through Cloudflare. We've detected 9 technologies on this site, covering security, auth, CDN, and CSS frameworks. The stack includes Clerk, Next.js, and React.

It's on one of the most common stacks we track, shared by 443 launches and more locked down than the typical Product Hunt launch.

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

9.5
StackScope Score
Excellent
100/100 Launch Readiness
Launch ready
3/3 Legal
Complete
2/2 Crawl files
Complete
Vibe Score 15 · 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 (9)

Infrastructure
CDN Cloudflare
Hosting Railway
Security Cloudflare Bot Management
HSTS
Build & Framework
Auth Clerk (4)
CSS framework Tailwind CSS
Developer tools Rspack
Framework React
Meta-framework Next.js (5)

Infrastructure

Network
AS400940 · US
DNSSEC
Enabled
DNSKEY records published. DNS responses signed.
Green hosting
Not green hosted
No green-energy record. Data from The Green Web Foundation.
SSL Certificate
Let's Encrypt
Valid 18 Jul 2026 to 16 Oct 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 p=quarantine (via apex tesserae.site) Quarantine (moderate)
?
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 (6)

Cookies (5)
NameLifetimeDetected as
_cfuvid session Cloudflare
__cf_bm < 1h Cloudflare
__client 1y Clerk
__client_uat 1y Clerk
__client_uat_4kLWSCzI 1y Clerk
Local storage (1)
KeySizeDetected as
__clerk_environment 5.8 KB Clerk

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)
Meta description is 196 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.

Performance How?

362 ms Server response
49% Faster than peers
3472 ms Largest contentful paint
0.00 Cumulative layout shift
923 KB Page weight
94 KB Image weight
2 Third-party domains
0 Console errors
0 Failed requests

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 onboarding signals +5
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

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

Well-Known Files

robots.txt
sitemap.xml (21 URLs)
security.txt
llms.txt
ads.txt
humans.txt
Privacy Policy
/privacy
Terms of Service
/terms
90% unique

Security Headers (5/6)

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

Build

Code splitting
19 JS files
2 CSS files
2 Third-party domains

Brand Colours

App Manifest

Tessera — See your app on every screen, live.
display: standalone 2 icons
theme #0b0c0f
Something not look right? If a technology shown here is wrong or out of date, email [email protected] and we'll review it.