Can JotForm be used without any cost?

Yes it can be used without paying anything. The FREE PLAN would suffice if your usage will meet the limits. To sum it up, on the Free Plan, you can:

1. Create 5 forms (account-wide / lifetime)

2. Receive 100 Submissions (per month)

3. Receive 3 Submissions with Payment (per month)

4. 100 MB Available Space (account-wide / lifetime)

5. 1,000 Form Views (per month)

6. And 500 Total Submission Storage (account-wide / lifetime)

All monthly limits get replenished on the 1st day of each month.

Related guide: Understanding-Your-Account-Usage-and-Limits 

In case you have other questions, just ask 😉