Zoho Creator is completely free for personal use. Meaning, it allows you to
- create 3 apps
- have 2 users (including administrator)
- store 1000 Records (form submissions)
- create 2 Reports
- store 200 MB size files in total (maximum of 5MB per upload)
- 250 emails daily
- Unlimited Email and Forum support
This link tells you when you need a paid version. Refer to https://www.zoho.com/creator/pricing.html for the full product pricing details.