There's a site called SmartyPig.
SmartyPig®: Simple. Smart. Savings.®
The name makes you wince, but it says 3.9% APY and has things like ACH fund transfers.
But, they also talk about "savings goals," so I can't tell if it's like a regular old online savings account.
That's weird. When I put in a URL, somehow other words get put in place, like an advertisement link.
Oh, looks like they require a monthly contribution. Maybe that's why they offer a reasonably high yield.