← Back to browse

Spreadsheetpreview

PDF.js for spreadsheets. Preview Excel XLSX files directly in the browser with no upload, no server, and no Microsoft Office dependency.

Productivity
Netherlands Estimated origin: Netherlands

Added July 7, 2026 · Last analysed July 7, 2026 · via Hacker News

Own this Launch?
Screenshot of Spreadsheetpreview

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 7 July 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.

Spreadsheetpreview is early-stage. Visible gaps: missing several security headers, incomplete legal pages, and no robots.txt or sitemap.

Launched on Hacker News on July 7, 2026. The site is hosted on Hetzner Online GmbH in Germany, with a domain registered 12 weeks before launch. We've detected 7 technologies on this site, covering analytics, developer tools, DNS providers, and business email. The stack includes Brevo, Caddy, and Fastmail.

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

3.1
StackScope Score
Poor
52/100 Launch Readiness
Partially ready
1/6 Security Headers
Poor
2/3 Legal
Partial
0/2 Crawl files
Missing
92/100 Performance
Fast
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 (7)

Infrastructure
DNS mijn.host DNS
Protocol HTTP/3
Server Caddy
Email
Business email Fastmail (3)
Email marketing Brevo
Build & Framework
Developer tools SheetJS
Analytics & Marketing
Analytics Umami (2)

Infrastructure

Network
HETZNER-CLOUD2-AS - Hetzner Online GmbH, DE
AS213230 · DE
DNS
mijn.host DNS
Authoritative nameserver
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 7 Jul 2026 to 5 Oct 2026
Certificate as captured in this snapshot, not a live check.
Domain Age
4 months
Registered Apr 2026 · Hosting Concepts B.V. d/b/a Registrar.eu

Email Security

⚠
SPF ?all Neutral (?all). Monitoring only, no enforcement.
✓
DKIM Detected via known email provider
✗
DMARC p=none None (p=none). Monitoring only.
?
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 (0)

This site uses no client-side storage we could detect on page load.

Readiness Breakdown How?

✓ Custom title and meta description
✓ Responsive viewport meta tag
✓ Semantic HTML (nav, main, article)
- Open Graph tags (title, image, description)
- Canonical URL declared
- Twitter card meta tags
- Favicon present

Performance How?

375 ms Server response
43% Faster than peers
592 ms Largest contentful paint
0.00 Cumulative layout shift
1.6 MB Page weight
1 KB Image weight
2 Third-party domains
0 Console errors
0 Failed requests

⚠ 1 images: 1 oversized, 1 without width/height, 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.

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
/license
? Analytics present, but it set no tracking cookies on our visit (it may be opt-in-gated).

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)

Build

3 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.