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Numblr

A free app helping you practice your English listening skill for English numbers, dates, money, time and phone numbers.

Education

Added April 22, 2026 · Last analysed April 22, 2026 · via · 60% 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 22 April 2026; the live site may have changed since.

Numblr ships with the basics, with a thorough launch checklist and clean crawl signals. Worth fixing first: missing several security headers, incomplete legal pages, and tracking cookies set before any opt-in.

Launched on Product Hunt on April 22, 2026. The site is hosted on Vercel. We've detected 11 technologies on this site, covering analytics, CSS frameworks, DNS providers, and business email. The stack includes Tailwind CSS, AWS Route 53, and Google Analytics.

It's running the same core stack as 2,462 other launches.

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

5.0
StackScope Score
Fair
82/100 Launch Readiness
Well prepared
0/3 Legal
Missing
2/2 Crawl files
Complete
Vibe Score 3 · 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 (11)

Infrastructure
DNS AWS Route 53
Hosting Vercel (2)
Security HSTS (2)
Email
Business email Rackspace Email (2)
Build & Framework
CSS framework Tailwind CSS
Analytics & Marketing
Analytics Google Analytics (3)
Inspectlet (2)
Mixpanel
RudderStack (2)
SEO Google Search Console
Commerce & Payments
Payments Stripe

Infrastructure

Network
AS16509 · US
DNS
AWS Route 53
Authoritative nameserver
DNSSEC
Not enabled
DNS responses unsigned. Cache-poisoning vulnerable.
SSL Certificate
Let's Encrypt
Valid 5 Mar 2026 to 3 Jun 2026
Certificate as captured in this snapshot, not a live check.

Email Security

SPF ~all Soft-fail (~all). Common and accepted.
?
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 (26)

Cookies (18)
NameLifetimeDetected as
rl_anonymous_id 1y RudderStack
rl_group_id 1y RudderStack
rl_group_trait 1y RudderStack
rl_page_init_referrer 1y RudderStack
rl_page_init_referring_domain 1y RudderStack
rl_session 1y -
rl_trait 1y RudderStack
rl_user_id 1y RudderStack
_ga 1y Google Analytics
_ga_GGKP46KVRD 1y Google Analytics
__insp_nv 1y Inspectlet
__insp_pad 1y Inspectlet
__insp_sid 1y Inspectlet
__insp_slim 1y Inspectlet
__insp_targlpt 1y Inspectlet
__insp_targlpu 1y Inspectlet
__insp_uid 1y Inspectlet
__insp_wid 1y Inspectlet
Local storage (8)
KeySizeDetected as
mp_0b593d4a15ddae0e6299489a425ca737_mixpanel 232 B Mixpanel
rudder.1ca86d05-0704-415b-b9b4-cd024f8e8647.ack 13 B RudderStack
rudder.1ca86d05-0704-415b-b9b4-cd024f8e8647.inProgress 2 B RudderStack
rudder.1ca86d05-0704-415b-b9b4-cd024f8e8647.queue 2 B RudderStack
rudder.1ca86d05-0704-415b-b9b4-cd024f8e8647.reclaimEnd 4 B RudderStack
rudder.1ca86d05-0704-415b-b9b4-cd024f8e8647.reclaimStart 4 B RudderStack
__insp_session_count 1 B Inspectlet
__mpq_0b593d4a15ddae0e6299489a425ca737_ev 604 B Mixpanel

Readiness Breakdown How?

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

Vibe Score Breakdown How?

SignalPoints
AI iconography signals +3

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
? No directive declared
? None advertised

Well-Known Files

robots.txt
sitemap.xml (28 URLs)
security.txt
llms.txt
ads.txt
humans.txt
? Privacy Policy not detected
? Terms of Service not detected
? Consent manager not detected
Analytics set tracking cookies on our visit, with no opt-in step.
Detection works best on English language sites.

Security Headers (1/6)

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

Performance

274ms response time
Faster than 60% of sites
3 third-party domains loaded

Build

2 JS files
3 CSS files
3 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.