I paid, but it still says I'm on the Free plan

Pro belongs to your account, meaning your email address, not to your phone. When you've paid and still see Free, it's nearly always one of the four things below. Check them in order.

1. Are you signed in with the email you paid with?

Open Dashboard → Billing on the website, or the Account tab in the app. If it says Free Account and lists no subscriptions, you're probably in a different account than the one that paid. Sign out and sign in with your other email address.

This is the cause most of the time. People have a school address and a personal address, and the purchase is on the other one.

2. Did you buy in the app before you signed in?

Apple lets you purchase before you have an account. If you did, open the app, sign in (enter your email and the code we send), then on the upgrade screen tap Restore purchases. That attaches the purchase to your account so the website unlocks too.

3. Did Restore say the purchase is already on an account?

That purchase is attached to a different CSTSetup account. It isn't lost. Sign in as that account and it's there.

4. Did you buy on the website while signed out?

If the email you gave at checkout already had an account, we don't sign you in automatically after paying. That's a safety measure. Sign in with that email and Pro will be waiting.

Still Free after all four?

Email [email protected] with the email address on your account. For an app purchase, attach a screenshot of the receipt from Apple or Google. We can match it to you.

Two things that are not the problem: clearing your browser cache, and reinstalling the app. Neither changes what's on your account.