Google's free hosted Lighthouse with real-user (CrUX) field data · Pricing: Free
PageSpeed Insights and SEO Score API both touch SEO, but they are different shapes of product. PageSpeed Insights is a Web tool + REST API (free, throttled); SEO Score API is a hosted REST API that returns a scored audit as JSON in about two seconds. This page is an honest side-by-side — including when you should pick PageSpeed Insights over us. Still shopping around? See our roundup of PageSpeed Insights alternatives organized by use case.
| Feature | PageSpeed Insights | SEO Score API |
|---|---|---|
| Pricing | Free | $0 free, $5+ / mo |
| Focus | Performance + Web Vitals | SEO + AI readability + performance |
| Real-user (CrUX) data | Yes | No |
| AI readability score | No | Yes |
| SXO / AEO / AIO scores | No | Yes (Starter+) |
| API quotas | 25k/day shared, ~400/100s key | Per-plan, dedicated |
| Per-key auth | Optional | Required (X-API-Key) |
| Output | JSON (Lighthouse + CrUX) | Compact scored JSON with priorities |
| CI/CD examples | Build your own | Official GitHub Action |
| Schema / structured-data checks | Limited | Detailed |
Not sure an audit API is the right swap? Here are the strongest PageSpeed Insights alternatives and PageSpeed Insights competitors, grouped by what you actually need — so you pick on use case, not marketing budget.
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.
Audit your site free — no PageSpeed Insights subscription, no credit card.
Score any URL across 83 checks in one API call. Free tier, key in seconds.