No, you can still register and integrate your roasting machine to store and manage your roasting history, even with free access.

No, only per-batch plans are charged. You won't be charged extra for the number of roasting machines or the number of roasters, but you may be subject to sanctions if you share a single account with multiple roasteries.

There is a difference in the length of the subscription period between the annual and monthly plans, and if you choose the annual plan, you'll pay 20% less than what you would pay for the same period with the monthly plan.