What is the duration of the free version? Can I try PROFESSIONAL version before buy?

Billing & Invoicing App LITE version is free for ONE YEAR
For the PROFESSIONAL version we understand how important of trying it out before buying the product, so we provide 15 days of free trail of the PROFESSIONAL version where you can download Just Billing App in any of your mobile or table device and play around to understand the flexible features. You can download the respective version from the URL above.