Pro is $19 a month for 150 reports a month, up to 20 in any one day, and the whole list on every category and search-term page.
Sign in first, then use the upgrade button on the pricing page. Payment goes through Stripe, so your card details never reach us.
The allowance resets on your billing date rather than trickling back a slot at a time, so the day you are charged is the day you have a full month of reports again.
You can cancel whenever you like, and you keep Pro until the end of the month you have already paid for.