All plans, including the freeTrial plan, are limited based on usage. Usage is measured in tokens and is measured on a monthly basis.

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You can see the details of your current plan, who the plan is licensed to, and your token usage in the current billing cycle by going to the Extensions > SheetGPT > Update License menu item in any Google Sheet where you are using SheetGPT:

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This will fetch the latest plan details from the SheetGPT backend and show you your current cycle's usage:

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You can always upgrade, downgrade or cancel your SheetGPT plan here, or contact support if you are having issues.