Tenzlo | Tech Stack & Analysis

What we found

Analytics set tracking cookies before any opt-in, and we found no consent manager.
It sends one of the six security headers we check; Content-Security-Policy is among those missing.
DMARC only monitors (p=none), so email spoofing this domain is still delivered.
Built with React and Supabase, the site is hosted on Hostinger and served through Cloudflare, with a domain registered 4 months before launch.

Built with: 18 technologies · Indie stack

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For light pages

<a href="https://firstsited.com/launch/11pc2bxe/tenzlo"><img src="https://firstsited.com/badge/11pc2bxe/stack.svg" alt="Tenzlo tech stack on FirstSited" height="28"></a>

For dark pages

<a href="https://firstsited.com/launch/11pc2bxe/tenzlo"><img src="https://firstsited.com/badge/11pc2bxe/stack.svg?theme=dark" alt="Tenzlo tech stack on FirstSited" height="28"></a>

How it fits together

Each technology runs on, or extends, the one it sits under.

React Framework
- React Router JavaScript library

Technology	Type
Infrastructure
Cloudflare	CDN
Cloudflare DNS	DNS
Hostinger	Hosting
HTTP/3	Protocol
Email
Hostinger Email	Business email
Amazon SES	Transactional email
Resend	Transactional email
Build & Framework
Supabase (2)	BaaS
Tailwind CSS	CSS framework
React	Framework
IPWho	Geolocation
@ungap/url-search-params	JavaScript library
React Router (2)	JavaScript library
Lucide Icons	UI library
shadcn/ui	UI library
Analytics & Marketing
PostHog (4)	Analytics
Google Search Console	SEO
Google Tag Manager	Tag management

Each technology links to its own page: which other new sites launched with it.

Site checks

Page basicsHow we check
	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)

Security headersHow we check
	Referrer-Policy via <meta name="referrer">
	X-Frame-Options
	Permissions-Policy experimental
	X-Content-Type-Options
	Content-Security-Policy
	Strict-Transport-Security
	X-XSS-Protection deprecated, not counted

Legal pages
	Privacy policy /privacy
	Terms of service /terms
	Consent manager not detected; analytics set tracking cookies on our visit with no opt-in step

Crawl files
	robots.txt
	sitemap.xml 15 URLs
	security.txt optional
	llms.txt optional
	ads.txt only for ad-funded sites
	humans.txt optional

AI crawlers No stanceHow we check
	llms.txt published not published
	No AI bots blocked in robots.txt
	Content-Signal none declared
	Link headers none advertised

Email

Record	Status	What it does
SPF ~all	Soft-fail (~all), common and accepted	Lists the servers allowed to send email for the domain.
DMARC p=none	Monitoring only (p=none)	Tells receivers what to do with email that fails SPF or DKIM.
DKIM	Found	Signs outgoing email. We check common selectors only, so a provider may use another.
MTA-STS	Not deployed	Stops email to the domain being downgraded to plain text in transit.
TLS-RPT	Not configured	Sends the owner reports of failed encrypted deliveries.

Hosting and network

Network	CLOUDFLARENET - Cloudflare, Inc., US AS13335, US
DNS	Cloudflare DNS authoritative nameservers
DNSSEC	Not enabled DNS answers are unsigned
Certificate	Google Trust Services valid 16 Sep 2026 to 15 Dec 2026, as captured
Domain age	4 months registered Jun 2026, HOSTINGER operations, UAB
Green hosting	Yes per The Green Web Foundation
Page build	8 JS files, 1 CSS file 3 third-party domains, code splitting
App manifest	Tenzlo — Rental Management display standalone; 3 icons
Brand colours

Storage: 15 items

Cookies 1
Name	Lifetime	Set by
ph_phc_xAvL2Iq4tFmANRE7kzbKwaSqp1HJjN7x48s3vr0CMjs_posthog	12mo	-

Local storage 8
Key	Size	Set by
app_brand_name	6 B	-
app_brand_slogan	28 B	-
app_doc_footer	0 B	-
app_favicon_url	104 B	-
app_logo_url	101 B	-
app_primary_color	0 B	-
ph_phc_xAvL2Iq4tFmANRE7kzbKwaSqp1HJjN7x48s3vr0CMjs_posthog	2.2 KB	PostHog
rentflow-theme	5 B	-

Session storage 6
Key	Size	Set by
ph_phc_xAvL2Iq4tFmANRE7kzbKwaSqp1HJjN7x48s3vr0CMjs_posthog	330 B	PostHog
ph_phc_xAvL2Iq4tFmANRE7kzbKwaSqp1HJjN7x48s3vr0CMjs_primary_window_exists	4 B	PostHog
ph_phc_xAvL2Iq4tFmANRE7kzbKwaSqp1HJjN7x48s3vr0CMjs_session_registered_properties	252 B	PostHog
ph_phc_xAvL2Iq4tFmANRE7kzbKwaSqp1HJjN7x48s3vr0CMjs_window_id	38 B	PostHog
tenzlo_country	2 B	-
tenzlo_fx_USD	2.5 KB	-

Performance

Measure	This site	Reading
Server response	146 ms	good, faster than 80% of sites
Largest contentful paint	956 ms	good
Layout shift	0.19	some
Page weight	716 KB	light
Image weight	1 KB	light
Images	2	2 larger than shown, 2 without width and height
Third-party domains	3
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: some AI signals. How much the site looks AI-generated. It is a pattern match shown for interest, not a verdict.

Which signals fired

Signal	Points
AI copy signals	+5
AI onboarding signals	+5
AI palette signals	+5
AI writing signals	+5
AI layout signals	+5

Analytics set tracking cookies on our visit and no consent manager was detected. UK and EU GDPR require opt-in before tracking runs, and more than 20 US states require honouring opt-out requests.
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.