4percentcalc
Test the 4% retirement rule against every year of real S&P 500 history since 1926. See your portfolio's success rate, worst-case and best-case starting years.
What we found
- We found no privacy policy or terms of service.
- Analytics set tracking cookies before any opt-in, and we found no consent manager.
- It sends four of the six security headers we check; missing are Permissions-Policy and Content-Security-Policy.
- Built with Rails and Stimulus, the site is hosted on Heroku, with a domain registered 9 months before launch.
- One more gap is listed further down the page.
Built with: 11 technologies
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For light pages
<a href="https://firstsited.com/launch/h0s1zgyz/4percentcalc"><img src="https://firstsited.com/badge/h0s1zgyz/stack.svg" alt="4percentcalc tech stack on FirstSited" height="28"></a>
For dark pages
<a href="https://firstsited.com/launch/h0s1zgyz/4percentcalc"><img src="https://firstsited.com/badge/h0s1zgyz/stack.svg?theme=dark" alt="4percentcalc tech stack on FirstSited" height="28"></a>
| Technology | Type |
|---|---|
| Infrastructure | |
Google Domains DNS
|
DNS |
Heroku
|
Hosting |
| HSTS | Security |
| Build & Framework | |
Rails
(3)
|
Backend framework |
Tailwind CSS
(3)
|
CSS framework |
Google Fonts
|
Font |
Stimulus
medium
|
Framework |
Hotwire Turbo
(2)
|
JavaScript library |
| Analytics & Marketing | |
Google Analytics
(4)
|
Analytics |
Google Tag Manager
(2)
|
Tag management |
| Business Tools | |
| Funraisin medium | SaaS |
Each technology links to its own page: which other new sites launched with it.
Site checks
| Custom title and meta description | |
| Open Graph tags (title, image, description) | |
| Twitter card meta tags | |
| Canonical URL declared | |
| Responsive viewport meta tag | |
| Semantic HTML (nav, main, article) | |
| Page title is 85 characters Google only shows about 60 characters of the title in search results; aim for 50–60 to keep the whole thing visible. | |
| Favicon present |
| Referrer-Policy | |
| X-Frame-Options | |
| Permissions-Policy experimental | |
| X-Content-Type-Options | |
| Content-Security-Policy | |
| Strict-Transport-Security | |
| X-XSS-Protection deprecated, not counted |
| 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 |
| robots.txt | |
| sitemap.xml 103 URLs | |
| security.txt optional | |
| llms.txt | |
| ads.txt only for ad-funded sites | |
| humans.txt optional |
| llms.txt published | |
| No AI bots blocked in robots.txt | |
| Content-Signal none declared | |
| Link headers none advertised |
| State | Record | Status |
|---|---|---|
| SPF -all | Strict (-all) | |
| DMARC p=reject | Reject (strict) | |
| DKIM | Not found at common selectors | |
| MTA-STS | Not deployed | |
| TLS-RPT | Not configured |
Hosting and network
| Network | SQUARESPACE - Squarespace, Inc., US AS53831, US |
|---|---|
| DNS | Google Domains DNS authoritative nameservers |
| DNSSEC | Not enabled DNS answers are unsigned |
| Certificate | Let's Encrypt valid 7 Nov 2026 to 5 Feb 2027, as captured |
| Domain age | 9 months registered Jan 2026, Squarespace Domains LLC |
| Green hosting | No record per The Green Web Foundation |
| Page build | 2 JS files, 2 CSS files 5 third-party domains |
| Brand colours |
Storage: 3 items
| Name | Lifetime | Set by |
|---|---|---|
| _four_percent_calc_session | session | - |
| _ga | 1y | Google Analytics |
| _ga_6FEBCMMB3M | 1y | Google Analytics |
Performance
| Measure | This site | Reading |
|---|---|---|
| Server response | 494 ms | good, faster than 30% of sites |
| Largest contentful paint | 5,880 ms | slow |
| Layout shift | 0.04 | good |
| Page weight | 2.2 MB | fair |
| Third-party domains | 5 | |
| Console errors | 0 | none |
| Failed requests | 0 | none |
From a single automated render of the home page. A quick guide, not a substitute for Lighthouse or field data. How we measure
Notes
- Looks AI-built: no AI signals. How much the site looks AI-generated. It is a pattern match shown for interest, not a verdict.
- Performance comes from one render on 10 November 2026 and will vary between visits.
How we know
FirstSited records what new websites are built with, usually within a day of going live. Most we find ourselves, by watching public internet infrastructure for brand-new sites; the rest come from Product Hunt, Hacker News and PeerPush. We checked this one in full: its tech stack, DNS, security headers and page basics. This page is what we saw on 10 November 2026; the live site may have changed since.
Every technology below links to its own page: which other new sites launched with it. Watch any of them and get every new site that uses it as it goes live, from £15 a month.