1. Google Keyword Planner
Google Keyword Planner is a classic favorite.
It’s free, but because the information comes directly from the search engine, it’s reliable and trustworthy. It’s also flexible, allowing you to:
- Identify new keywords.
- Find related keywords.
- Estimate the number of searches for each variation.
- Estimate competition levels.
The tool is easy to access and available as a web application and via API, and it costs nothing; it just requires a Google Ads account.