Google Trends

Free interest-over-time for any search term, by region

Free · best for checking whether demand is rising or fading · Keyword & trend research

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8.5editor score

Pros

Free and instant
Regional breakdown shows where demand sits
Compare up to five terms

Cons

Relative numbers, not search volumes
Thin data for niche or local terms

What it does

Shows how search interest in a term has moved over time, by country and region, relative to its peak.

Using it to validate

Type the problem your idea solves, not the solution ("car detailing near me", "how to stop a leaking tap"). A flat or falling line is a timing warning; a rising one supports the timing dimension. Use the regional view to see whether your city over- or under-indexes.