Don’t trust the discounts
I received an offer on the app for a three day trial, but still got charged $19.99 for a subscription, when I had cancelled the three day trail before it had even started. When I emailed apple for a refund (which they gave, thankfully) they said the app had never registered the three day trial and had charged me straight away. It’s a good app, but I don’t recommend an app that has a reputation from stealing from their customers.