Thanks for the suggestion I have now downloaded this but it says there is a week free trial then £59.99 for the year. I am wondering if I downloaded the wrong app.
I'm already a paid premium subscriber so it's hard for me to answer this, but if you check out the RWGPS site, the free "Starter" a/c allows you to record rides, and premium will "Unlock everything our mobile app offers". Which suggests to me that if you set up a "Starter" a/c then you should be able to use it with the app.
But maybe not. I'm not really an expert on the app, as I don't use it all that much. And I'm also not an expert on the "Starter" free a/c. All I can suggest is that you fiddle around and experiment.
Perhaps, as I suspect, the "free trial" may be just a free trial of
premium features, after which you have to either pay to retain them or revert to the basic "Starter" level features. I don't know, check out the wording of the message. Or maybe I'm completely wrong and the app doesn't work at all for the free a/c. I leave that to you to figure out.
https://ridewithgps.com/plans
Edit: This link shows you what the "Basic" account can do. Is "Basic" free? Is it the same as "Starter". I don't know.
https://support.ridewithgps.com/hc/en-us/articles/13901706641563-Overview-of-the-Basic-Upgrade
A basic unpaid RWGPS a/c will last indefinitely. I had one for several years before I went to premium. What I don't know is the extent to which it will allow you to use the app.