Simple Online Ruler

Use Simple Online Ruler to measure actual size on screen in centimeters, millimeters, and inches. Calibrate by auto-detecting your device, entering screen diagonal, or matching a credit card.

Productivity

simpleonlineruler.com · Added June 20, 2026 · Last analysed June 20, 2026 · via · 67% unique tagline

Own this Launch?

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 20 June 2026; the live site may have changed since.

Simple Online Ruler ships with the launch fundamentals in place, with a thorough launch checklist, fast page loads, and clean crawl signals. What needs work: missing Content-Security-Policy and Strict-Transport-Security, incomplete legal pages, and no email security records.

Launched on Product Hunt on June 20, 2026. The site is hosted on Cloudflare in the United States, with a domain registered 1 week before launch. Our crawler found 7 technologies on this site, covering analytics, CDN, CSS frameworks, and DNS providers. The stack includes Astro, Tailwind CSS, and Cloudflare.

Notably, it's running the same core stack as 276 other launches and tighter on security headers than most Product Hunt launches.

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

8.1

StackScope Score

Excellent

100/100 Launch Readiness

Launch ready

4/6 Security Headers

Decent

2/3 Legal

Partial

2/2 Web Standards

Complete

100/100 Performance

Fast

Vibe Score 0 · No AI signals

Informational pattern-match signal. Does not feed the StackScope Score. See which fingerprints fired →

Tech Stack (7)

Infrastructure

CDN	Cloudflare
DNS	Cloudflare DNS
Protocol	HTTP/3

Build & Framework

CSS framework	Tailwind CSS
Meta-framework	Astro

Analytics & Marketing

Analytics	Microsoft Clarity
SEO	Google Search Console

Infrastructure

Network

CLOUDFLARENET - Cloudflare, Inc., US

AS13335 · US

DNS

Cloudflare DNS

Authoritative nameserver

DNSSEC

Enabled

DNSKEY records published. DNS responses signed.

SSL Certificate

Google Trust Services

Valid 7 Jun 2026 to 5 Sep 2026

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

Domain Age

14 days

Registered Jun 2026 · Cloudflare, Inc.

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.

Storage (0)

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

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)

⚠

Page title is 69 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 191 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?

116 ms Server response

90% Faster than peers

340 ms Largest contentful paint

0.00 Cumulative layout shift

45 KB Page weight

3 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.

AI Stance

Welcomes AI crawlers

✓ llms.txt published

✓ No AI bots blocked in robots.txt

Content-Signal

✓ ai-train = yes

✓ search = yes

✓ ai-input = yes

Link headers

✓ sitemap

✓ api-catalog

✓ service-desc

Well-Known Files

✓ robots.txt

✓ sitemap.xml (16 URLs)

✗ security.txt

✓ llms.txt

✗ ads.txt

✗ humans.txt

Legal

✓ Privacy Policy

? Terms of Service not detected

? Consent manager not detected

Analytics detected; tracking fires without visitor opt-in.

96% unique

Mentions:

Cookies Do Not Sell

Security Headers (4/6)

✓

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

✓ Code splitting

4 JS files

1 CSS files

3 Third-party domains

Brand Colours

App Manifest

Simple Online Ruler

display: standalone 3 icons

theme #ffffff

utilities productivity education

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