Anything that charges you automatically and repeatedly: streaming services, cloud storage, apps, gym memberships, software, meal kits, news subscriptions.
Divide the annual price by 12 and enter that as the "monthly cost" so it's counted consistently with your other subscriptions.
Small recurring charges are easy to underestimate because each one feels small individually. Seeing the long-run total, even at today's prices with no increases, often reveals spending that's worth reviewing.