I actually don't want to automatically cancel free trials. I wouldn't sign up for one if there wasn't a reasonable chance I'd be interested in keeping the service.
Anyway, I find this easy and effective (free too, if you already own a phone):
When I sign up, I tell my phone to remind me to review on such-and-such a date (or "in 29 days" or whatever).
Anyway, I find this easy and effective (free too, if you already own a phone):
When I sign up, I tell my phone to remind me to review on such-and-such a date (or "in 29 days" or whatever).