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. For a direct feature-by-feature breakdown, see SEO Score API vs PageSpeed Insights.
Run an audit before you commit to anything.