For a limited time, you can actually get an extended trial (30 days instead of 14) by following the instructions below.
Kartra 30 Day Trial: Instructions – Read Carefully
Step 1: Click the big button on this page.
Step 2: Click “Start your trial”
Step 3: Wait for the page to be fully loaded, then pretend to navigate off the page
Step 4: Accept the exit pop-up to get the 30-day trial.
Cancel anytime. 
Need more info before joining? Check out: Kartra review.