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List Detective: Free Email List Checker

Find out what's wrong with your email list before it damages your deliverability and sender reputation. Free, instant, private — your list never leaves your browser.

Marketing
Sweden Estimated origin: Sweden

Added July 4, 2026 · Last analysed July 4, 2026 · via

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Screenshot of List Detective: Free Email List Checker

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 4 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.

List Detective: Free Email List Checker is early-stage. Worth fixing first: missing several security headers, incomplete legal pages, and no robots.txt or sitemap.

Launched on Product Hunt on July 4, 2026. The site is hosted on Loopia, with a domain registered the day of launch. We've detected 8 technologies on this site, covering affiliate, DNS providers, business email, and web fonts. The stack includes AddToAny, Google Fonts, and Google Search Console.

It's a rare Loopia sighting, just 23 in our data.

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

2.1
StackScope Score
Poor
72/100 Launch Readiness
Well prepared
0/6 Security Headers
Poor
0/3 Legal
Missing
0/2 Crawl files
Missing
92/100 Performance
Fast
Vibe Score 45 · Some 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 Loopia
Hosting Loopia (2)
Server nginx
Email
Business email Loopia Email
Build & Framework
Font Google Fonts
Analytics & Marketing
Affiliate Impact
SEO Google Search Console
Social AddToAny (2)

Infrastructure

Network
LOOPIA - Loopia AB, SE
AS39570 · SE
DNS
Loopia
Authoritative nameserver
DNSSEC
Enabled
DNSKEY records published. DNS responses signed.
Green hosting
Green hosted
Host runs on renewable energy. Data from The Green Web Foundation.
SSL Certificate
Let's Encrypt
Valid 3 Jul 2026 to 1 Oct 2026
Certificate as captured in this snapshot, not a live check.
Domain Age
2 months
Registered Jul 2026 · Ascio Technologies, Inc. Danmark - Filial af Ascio technologies, Inc. USA

Email Security

✓
SPF -all Strict (-all). Strong.
?
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) (partial) missing og:image
✓ Responsive viewport meta tag
✓ Favicon present
✓ Semantic HTML (nav, main, article)
⚠
Meta description is 165 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.
- Canonical URL declared
- Twitter card meta tags

Performance How?

37 ms Server response
99% Faster than peers
308 ms Largest contentful paint
0.16 Cumulative layout shift
177 KB Page 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 writing signals +5
AI code-structure signals +10
Recognised AI builder signature +30

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
✗ security.txt
✗ llms.txt
✗ ads.txt
✗ humans.txt

Legal

? Privacy Policy not detected
? Terms of Service not detected
Detection works best on English language sites.

Security Headers (0/6)

✗
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

2 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.