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It’s “pay what you want” for Pro, at least for now. I think the minimum is $1.99.

Pro accounts have been introduced already. You now only have 3 custom applets allowance anymore. But I didn't see any limitation on using existing applets. Just tells me I've used (5 out of 3) custom applets in my account.

With Zapier in the freemium model you have only 5 zaps available.