Any usability studies of the readability of Open Sans?

1. Is Open Sans readable?
2. Is Open Sans a good font?
3. Is Open Sans font free for commercial use?

Is Open Sans readable?

According to Google, Open Sans is “optimized for print, web, and mobile interfaces, and has excellent legibility characteristics in its letterforms.”

Is Open Sans a good font?

Open Sans is excellent for any type of use. It's incredibly readable in small sizes and also works great when printed in huge letters. The best thing of all, it's a free font! You are free to use and download it for your next design project.

Is Open Sans font free for commercial use?

The fonts are free to use, making beautiful type accessible to anyone for any project.