Is the app free to use?

You can use pro mode 7 days as free trial. And, Pro Mode is 2.99$ for monthly and 19.99$ for life time.

Which features can i use in pro mode

You can add notes. You can add voice and photo to your notes. You can categorize and archive your notes. You can set alarms too.

Does our data store in cloud ?

No, All datas are stored in your mobile phone.