What costs money, and what does not
The work is free because it happens on your machine. Keeping it is what an account is for.
Free, with no account
Every browser-lane operation, unlimited, at any file size your machine can handle. Plus three server operations a day for the ones that need a server.
Included with a Leumas membership
Saved projects across several files, a much larger server-operation allowance metered in CPU-seconds, batch runs and an API key.
Questions
Is there an editor-only plan?
No, deliberately. The server lane is small and bursty, so an allowance plus the shared token wallet prices it correctly without asking anybody for a second subscription.