Although TileForge can be used without a license, export resolution in the free version is capped at 50 pixels per grid square (sufficient for use in many popular virtual tabletop programs, but not suitable for printing) unless you purchase a license, which enables export resolutions of up to 300 pixels per grid square.
Maximum tile size is also limited to 6×6 grid squares without a license (up to 20 x 20 grid squares allowed with a license), and there will likely eventually be advanced features that will only be available to licensed users.
Note: TileForge is a brand new app, and it’s likely to still have some minor bugs. They will quickly be sorted out with a patch (probably in late January 2023). Please don’t purchase a license if you’re not willing to put up with the initial “growing pains”.