Yes, if you make the account work for you. Some platforms, like Simple, have a savings component built in; others automatically set you up with a linked savings account once you open checking. With the high-yield interest rates offered on many of the best accounts, you might be surprised at how much you can save.
In most cases, though, a checking account won’t be your main savings stash. Online checking accounts work best to supplement your savings and make everyday spending easier.