I received an offer to upgrade to premium for 30 days to see if I wanted to become a premium member. I deleted the e-mail and was hoping to have that offer sent again so I can try it.
Please follow this link to start the trail period. https://todoist.com/Users/freeTrial
You can also sign up for Premium and if it turns out it's not what you are looking for, we will give you a full refund :)