Google Keyword Planner

Google Keyword Planner is a free tool within Google Ads designed primarily for PPC campaign planning, but it's invaluable for SEO keyword research. It provides search volume forecasts, competition levels (for ads), and bid estimates.

Its greatest strength is the data comes directly from Google, offering a reliable baseline for search demand. The tool is best for startups beginning their keyword strategy and those running Google Ads. It's free but requires a Google Ads account. It ranks well due to its direct data source, cost (free), and utility in building a foundational keyword list, though its volumes are ranges and it's geared towards commercial intent.