I've been using [[Linear.app]] for over 3 years at this point and haven't paid them anything—Their free plan is that good.
However, I've been using Linear to track my job search and that means I've been creating a slew of new issues. This pushed me over the limits of the free plan, so at long last I'm paying them.
This is great though. I've gotten lots of value out of Linear over the years and I still use it nearly-daily so I'm happy to pay them.
In my opinion this is the ideal of freemium SaaS products. A free tier that makes the product essentially free for personal use, but which will charge business users and possibly power users.