The free plan is more feature-lite. Although you can have more users than the base dev tier, you don’t get things like custom domains, database migration, etc.
The dev and dev pro tiers allow you to have a fully customizable solutions, feature rich, and pay for the amount of users you have. You can start with 1k users and scale up when necessary.
If you want to dive into the differences it would probably be best to talk to the sales team, they have a deeper understanding of the pricing differences, how to scale price-wise, etc. If you want to do that, use the
Talk To Sales button in the top right.
We typically deal with more technical questions here in the Community, but I am always happy to help with anything I can. Let me know if you have more questions about it!