OpenSEO: keyword research without the subscription
An open-source alternative to Semrush and Ahrefs for finding what people search for.
OpenSEO is an open-source alternative to Semrush and Ahrefs. It helps you find keywords: what people search for, and how hard it is to rank for it.
Why it matters
If you publish content, knowing what people actually type into a search box beats guessing. The big paid tools are expensive for someone starting out.
The facts
- Project: every-app/open-seo on GitHub
- Stars: over 26,000 (as of 7 November 2026)
- Main language: TypeScript
- It is released under the MIT licence.
- Website: https://openseo.so
Before you install it
It is a young project, created in 2026. Keyword numbers from any tool are estimates, so use them as a guide, not as a promise.
I read the project page and its description to write this. I have not audited the code, so treat it as a pointer, not a recommendation to trust it with anything sensitive.