Soco Pro starts with a 7-day free trial. If you cancel before it ends, you keep access until the trial is over and you won't be charged.
How long the free trial lasts
The Soco Pro free trial lasts 7 days. It starts when you sign up for Pro through the App Store, and it turns into a paid monthly subscription when the trial ends unless you cancel first.
What happens if you cancel during the trial
If you cancel during your free trial, you keep Pro access until the trial ends, and you won't be charged. To make sure you aren't charged, cancel at least 24 hours before the trial ends, as Apple requires.
Apple's guide to canceling is here: If you want to cancel a subscription from Apple.
How to cancel during the trial
To cancel during the trial, open the Soco app, tap the account icon in the top right, and select Manage Subscription. From there you'll finish in your Apple subscription settings.
In short
Soco Pro comes with a 7-day free trial that becomes paid when it ends. Cancel at least 24 hours before the trial ends to avoid a charge, and you keep Pro access until the trial is over.