Picked by use case, not by marketing budget.
PageSpeed Insights is the gold standard for Core Web Vitals from Google itself, and it's free. For pure performance you can rarely beat it. But it's narrow — if you want SEO depth, AI readability, or higher quotas, alternatives live below.
If you spend most of your PageSpeed Insights time on site audits and you'd rather get JSON your code can act on, SEO Score API is the cheapest, fastest path. If you rely on PageSpeed Insights for backlinks, keyword research, or rank tracking, no API-first tool will fully replace it.
Only partly. We include performance signals but not the full Lighthouse trace and not CrUX field data. For Core Web Vitals from Google, keep using PSI. For broader SEO + AI readiness checks across many URLs, use us.
PSI is free and excellent for spot checks. At higher volume you hit quotas (25k/day shared globally, ~400 requests per 100s per key) and you'd build the rest of the stack yourself: batch, history, alerts, scoring layer, broader SEO depth. SEO Score API covers that out of the box.
We surface page response time, HTML size, DOM size, and render-path basics, but not full Web Vitals. If Web Vitals is your priority, run PSI alongside us.
Yes — every audit checks JSON-LD presence, validates types, and reports gaps. PSI's structured-data coverage is comparatively shallow.
Run an audit before you commit to anything.