Website readiness profile · Snapshot 23 October 2026
expo.dev
expo.dev's public homepage, certificate and DNS checked against 31 practices and compared with 231 Programming & Software sites.
- Readiness index
- 94/100
- Ahead of
- >99%
- Practices observed
- 28/31
- Popularity band
- Top 50K
Programming & Software median 68
of measured Programming & Software sites
0 of 31 could not be measured
Chrome UX Report top-sites list
Readiness by lane
Green: expo.dev. Thin bar: Programming & Software peer median.
Enable
100/100
Peers 81
Harden
97/100
Peers 59
Accelerate
88/100
Peers 65
Recover
0/100
Peers 7
Priority fixes for expo.dev
Ordered by impact and by how common each practice is among peers.
Priority 1 · Accelerate
No render-blocking scripts in <head>
Observed: The homepage <head> loaded 1 external script without async or defer.
Why it matters: A plain <script src> in the head stops the browser from showing anything until that file has downloaded and run.
What to do: Add defer to scripts that need the DOM, async to independent ones such as analytics, or move them to the end of the body.
On Next.js: Use the next/script component with an appropriate loading strategy.
51% of Programming & Software peers do this. Limit: Based on the homepage HTML delivered to an automated client; scripts that run later were not executed.
Guide: Control Third-Party Scripts Before They Control Your Page
Priority 2 · Harden
Referrer-Policy set
Observed: The homepage response did not include a Referrer-Policy header.
What to do: Send Referrer-Policy: strict-origin-when-cross-origin unless you have a reason to share more.
24% of Programming & Software peers do this.
Priority 3 · Recover
Nameservers spread across providers
Observed: All nameservers for expo.dev belong to Cloudflare.
What to do: Treat this as an advanced step. Add a secondary DNS provider through zone transfers or a multi-provider setup, then test changes carefully, since both providers must stay in sync.
On Cloudflare: Cloudflare supports zone transfers for primary or secondary DNS setups on eligible plans.
7% of Programming & Software peers do this.
Guide: Website Uptime Readiness: Prepare Before Traffic Arrives
What expo.dev already does well
Practices fewer than half of Programming & Software peers use.
- DNSSEC signedDNSSEC delegation (DS record) present.12% of peers
- security.txt publishedsecurity.txt with a contact found.15% of peers
- CAA records limit who can issue certificatesCAA limits issuance to comodoca.com, digicert.com, letsencrypt.org and others.23% of peers
What we saw
- Homepage checked
- https://expo.dev/
- Homepage response
- HTTP 200
- TLS
- TLSv1.3, HTTP/2
- Certificate
- Google Trust Services, 90-day validity, expiring 2027-01-03
- CDN or edge
- Cloudflare, Google edge
- Platform or framework
- Next.js
- DNS operators
- Cloudflare
- HSTS
- max-age 365 days, includeSubDomains
- DMARC policy
- p=quarantine
- Homepage HTML
- 312 KB, br
- Images on homepage
- 86 (png 57, jpg 54, webp 54, svg 8)
Limits: homepage only, one location, one moment. Header checks reflect the homepage response; other pages may differ.
Stack and providers
Seen in the homepage response, certificate and DNS. Provider pages compare how their customers configure the same checks.
All 31 checks
Select a gap for the method and fix. How each check works
Not observed 3
Observed 28
- HTTP requests move to HTTPS
- HSTS kept for at least a year
- TLS 1.3 negotiated
- Certificate has more than 14 days left
- Certificate lifetime of 100 days or less
- CAA records limit who can issue certificates
- DNSSEC signed
- security.txt published
- DMARC policy enforces quarantine or reject
- X-Content-Type-Options: nosniff
- Framing restricted
- Content Security Policy present
- HTTP/2 negotiated
- HTTP/3 advertised
- HTML compressed
- Static files cached for 30 days or more
- Modern image formats in use
- Offscreen images lazy-loaded
- robots.txt published
- XML sitemap discoverable
- Reachable over IPv6
- Canonical URL declared
- Meta description written
- Mobile viewport configured
- Structured data present
- Social preview image set
- Page language declared
- At most one redirect to the homepage
Own expo.dev?
Re-run the checks after a change, or verify the site in a free workspace to save reports with history, compare against similar sites and competitors, and track a private action plan. What owners get.
Live status for this site: Status Is Down: expo.dev. This profile covers configuration only.