John Voorhees has some great recommendations (🔒) for developers offering in-app subscriptions, such as using consumables rather than time to limit their free trials, as Notion does with their Notion AI trial:

As my setup grew, I started exploring more advanced features and asking Notion AI for help implementing my setup. The Notion AI trial didn’t begin until I was ready to try it, and the free query allotment was enough to convince me of the feature’s value. The experience felt so natural that by the time I’d run out of free Notion AI queries, I was happy to start paying.