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Calculate My Heart Rate

Calculate your 5 personalized heart rate training zones using the Karvonen formula. Free calculator: enter age & resting HR for accurate zones tailored to your fitness. Optimize workouts now!

Health
United States Estimated origin: United States

Added June 26, 2026 · Last analysed June 26, 2026 · via PeerPush

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 26 June 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.

Calculate My Heart Rate ships with the launch fundamentals in place, with complete legal pages, a complete set of security headers, and a thorough launch checklist. Worth fixing first: incomplete email security.

Launched on PeerPush on June 26, 2026. The site is hosted on AWS S3 and served through AWS CloudFront, with a domain registered 6 weeks before launch. We've detected 15 technologies on this site, covering advertising, consent tooling, analytics, and CDN. The stack includes Google, Google Funding Choices, and Amazon SES.

It's running the same core stack as 512 other launches and tighter on security headers than most PeerPush launches.

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

10.0
StackScope Score
Excellent
100/100 Launch Readiness
Launch ready
3/3 Legal
Complete
2/2 Crawl files
Complete
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 (15) · Scale-up stack

Infrastructure
CDN AWS CloudFront
Cloud Amazon Web Services
DNS AWS Route 53
Hosting AWS S3
Security HSTS
Email
Transactional email Amazon SES
Build & Framework
Font Google Fonts
Analytics & Marketing
Advertising Google Ads (2)
Google AdSense (3)
Analytics Google Analytics (4)
Consent Google
Google Funding Choices
SEO Google Search Console
Social Google Search
Tag management Google Tag Manager (6)

Infrastructure

Network
AS16509 · US
DNS
AWS Route 53
Authoritative nameserver
DNSSEC
Not enabled
DNS responses unsigned. Cache-poisoning vulnerable.
Green hosting
Not green hosted
No green-energy record. Data from The Green Web Foundation.
SSL Certificate
Amazon
Valid 15 May 2026 to 28 Nov 2026
Certificate as captured in this snapshot, not a live check.
Domain Age
3 months
Registered May 2026 · Tucows Domains 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 p=quarantine 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 (1)

Cookies (1)
NameLifetimeDetected as
FCCDCF 1y Google Funding Choices

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 64 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?

146 ms Server response
81% Faster than peers
424 ms Largest contentful paint
0.01 Cumulative layout shift
1.1 MB Page weight
2 KB Image weight
6 Third-party domains
0 Console errors
0 Failed requests

1 images: 1 oversized, 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.

Vibe Score Breakdown How?

SignalPoints
AI palette signals +5
AI writing signals +5
AI iconography signals +5
Unfilled template placeholders +10
AI CSS signals +15
AI code-structure 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

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 (22 URLs)
security.txt
llms.txt
ads.txt
humans.txt
Privacy Policy
/privacy-policy.html
Terms of Service
/terms.html
Consent manager: Google
90% unique

Security Headers (6/6)

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

Build

Code splitting
9 JS files
2 CSS files
6 Third-party domains

Brand Colours

App Manifest

CalculateMyHeartRate
display: standalone 3 icons
theme #E24B4A
health fitness
Something not look right? If a technology shown here is wrong or out of date, email [email protected] and we'll review it.