In basic (free) app version you receive 300 transcription credits per month. Regardless how many credits you've used they refill back to 300 every 30 days. If you've used all 300 credits before end of month you will only receive audio records without transcription. If you'd like to keep getting automatic transcription you can purchase Premium Subscription(if you're beta-tester you can get bonus credits for feedback, survey answers or interviews).
Premium Subscription increases your monthly credit limit to 1000 allowing you to take much more notes than average user, while still staying organised with text transcription, hashtags, reminders and more. To purchase Premium Subscription please contact us at firstname.lastname@example.org. Soon you'll be able to purchase it with in-app purchases.
p.s. you can check your remaining credits in Senstone App->Settings->My Profile