1. Take up the free 7-day trial then pay £1.49 per week
2. Pay monthly at £3.99 per month
3. Take out the annual subscription for 1 yearly fee of £18.99
All these options are cancellable at any time.
I had a quick play around with the app this morning and was able to create some amazing effects! Check out my butterflies. I used all the different brushes and tools, and I particularly love the bottom-right one that I did with markers.