How many submissions are allowed in a free account?

how many submissions are allowed in a free acct? does it expire?

In the Free plan, you can receive 100 submissions per month. The monthly limit resets every 1st day of the calendar month.

No, the Free plan does not expire. However, once you reached the limits, you will be asked to upgrade or your account will be suspended temporarily.

I recommend you check the following links:

https://www.jotform.com/pricing/
https://www.jotform.com/help/408-Understanding-Your-Account-Usage-and-Limits

Hope that helps. Thank you.