What all features/facilities are included in Book Keeper Subscription and what are the limitations?

Trial version and full versions are exactly same.

Check out pricing: http://bookkeeperapp.net/subscription/

Check out all features: http://bookkeeperapp.net/appfeatures/

To purchase , just login on website: http://bookkeeperapp.net/log-me-in/
Choose your plan and make payment. That's it!
It will be activated instantly.

All plans of Book Keeper comes with

Free Updates	Unlimited Companies
Free Support	Unlimited Accounts
Free License Transfer	Unlimited Items
Free Sync	Unlimited Transactions

• Free Updates: Book Keeper development team will continue to develop new features and you will get all those updates for free. If you have requested for some customization specially for you, Book Keeper team may or may not consider that and may charge you for the same.
• Free Support: All our customers gets unbiased support. Your free support includes online telephonic + remote desktop support up to 1000 minutes/year.
• Free License Transfer: You can change your device as many times as you want. No conditions apply. Feature may vary between different platforms like: Android, iOS and Windows.
• Free Sync: Book Keeper has tied up with Dropbox to provide free sync across your devices. Sync up to 2 GB is includes for free. If you store only Book Keeper company file, 2 GB data will be enough for 200 years. (Attachments/Reference document are not included). Make sure you have stable internet speed of minimum 1 Mbps. Recommended: 4 Mbps. Setting up company password is mandatory for syncing. Also, free sync is provided up to 3 PCs and 10 mobile devices.
• Unlimited Companies: ~ 100 companies
• Unlimited Accounts: ~ 5000 accounts
• Unlimited Items: ~ 5000 items
• Unlimited Transactions: ~ 100 transactions/day
• Unlimited Users: ~ 100 users
• For Indian Users, In Monthly plan, you will get 100 api for each - gst search, eway bill and einvoicing,In yearly plan, you will get 1000 api for each, and for lifetime plan, 5000 apis for each. You can buy additional apis here: https://rzp.io/l/51AKVv8q