The first trip is on us (free). After that we offer a one-way, roundtrip, or multi-city trip for $9.99 or an unlimited 1-year subscription for $24.99.
Your trial will not automatically turn into a subscription. It's simply a trial, no strings attached. If you wish to use the app again you will be asked to purchase a single trip or a subscription plan before adding your flights.
If you are a Timeshifter super user you can purchase a lifetime subscription for $149 here: https://www.timeshifter.shop