Chime

Chime bundles free FICO credit score tracking into its mobile banking app, pulling your score directly from Experian. You'll get alerts whenever your score changes, and the app shows your score and report every time you log in.

Best if you already bank with Chime or are considering switching to them. The free monitoring alone is solid, but you're getting it as a perk of their checking account and prepaid card services rather than as a standalone tool.