Decisions, tested
Technical SEO decisions with a straight answer
Each page answers one “this or that” question up top, then shows the measurements behind it — from sites we actually scanned, not opinions recycled from 2019.
WebP vs AVIF: Which Image Format to Ship in 2026
Ship AVIF with a WebP fallback when your build or image CDN can encode both automatically. AVIF was smaller than WebP at equal quality on all 20 images we tested — a median 21.5% — but took about five times longer to encode. If you can only pick one format, WebP is the simpler safe default.
Updated Oct 24, 2026·5 min read
Subdomain vs Subfolder: Which Is Better for SEO?
For a blog, guides or other marketing content, use a subfolder (example.com/blog). Use a subdomain only when the section is a genuinely separate product, platform or audience — like docs, an app or a community — and you're prepared to grow it as its own site.
Updated Oct 24, 2026·5 min read
HTTPS vs HTTP: What It Changes for SEO and Users
Use HTTPS on every page — there is no remaining case for serving a public website over plain HTTP. It encrypts traffic, is a Google ranking signal, avoids Chrome's "Not secure" label and is free to set up.
Updated Oct 24, 2026·5 min read
AEO vs SEO: What Changes, What Doesn't, What to Fix
SEO earns rankings and clicks in search results; AEO earns mentions and citations inside AI answers. They share most of the groundwork, so do SEO first — then measure what AI assistants actually say, because that part SEO tools can't see.
Updated Oct 24, 2026·5 min read
301 vs 302 Redirect: Which to Use (We Tested 300+ Sites)
Use a 301 when a URL has moved for good and a 302 only when the original URL is coming back. Google shows the new URL for permanent redirects and keeps the old one for temporary ones.
Updated Oct 24, 2026·5 min read
See which of these your site gets wrong
The free SEO audit checks redirects, HTTPS, structure and images across your whole site.