A service called DoNotPay can manage your free trials. Sign up using its digital credit card number and you won’t be charged when the trial ends.
The Free Trial Card is a virtual credit card you can use to sign up for free trials of any service anonymously, instead of using your real credit card. When the free trial period ends, the card automatically declines to be charged, thus ending your free trial. You don’t have to remember to cancel anything. If you want, the app will also send an actual legal notice of cancellation to the service.
I’m interested to try this out. Currently I use a service called Privacy, which lets me generate virtual cards that I can lock to a certain merchant or money amount. The story by Wired is about free trials, but the app description sounds like it can do more, calling itself a “robot lawyer.”