Free credits to let you start using the app are available on selective plans when you subscribe for the first time.
At the time of writing this answer, Free Credit offered is as below:
- Yearly - 500 Credits
- Monthly - 200 Credits
- Weekly - 50 Credits
Generally, most users choose the Yearly plan as it also comes with 10x more Credits than the Weekly, and pay just 32% of the Weekly for a year. Monthly is still a better choice as it gives 4x Credits and yet subscription price is 85% of the Weekly plan!