There are two versions of MixEffect available on the App Store:

MixEffect
MixEffect is a free download from the App Store.
Features are limited to creating new switcher connection and streaming service entries, Program/Preview, Fader Bar control, and running the ATEM Simulator.
Unlock MixEffect Pro with a one-time In-App Purchase payment* of USD$49.99. No subscriptions or hidden fees.
MixEffect offers a generous 30-day trial of MixEffect Pro so you can evaluate all of its features before deciding to purchase.

MixEffect Pro
MixEffect Pro is a paid up-front version of MixEffect with all the Pro features unlocked.
If you make use of Apple Business Manager or Apple School Manager, this is the app to purchase in order to deploy MixEffect Pro across multiple devices in your company or organization.
The cost* is the same as purchasing the Pro Unlock IAP in MixEffect, USD$49.99.
- Price shown is for US App Store. Other countries may display different pricing based on tax and exchange rates.