Yes. Metzee runs in a browser, so any tablet with a current browser works — iPad, Android tablet, or a Windows one.
Nothing to install. Why is there no iPhone app?
Where a tablet is better
Watching. A bigger screen is a genuinely better way to judge an item. Condition, colour, the grain of a thing — all of it reads better at size, and that is the whole argument for buying live rather than from photographs.
Reading the chat while watching. There is room for both without one crowding the other.
Seller paperwork. Listings, delivery rates, the finance screens. Long forms are nicer on a big screen.
Where a phone still wins
Bidding in the last seconds. A phone in your hand beats a tablet on a stand, and the final ten seconds reward being ready rather than fast. The last ten seconds
Going live. Broadcasting is built around a phone — its camera, held or propped, moved over the item. A tablet is awkward to hold at the angle a show needs and its camera is usually worse than the phone in your pocket. How to go live
Notifications. The thing you actually carry is the thing that should tell you that you have been outbid.
The arrangement that works well
Tablet to watch, phone to bid. Both signed into the same account, the show on the big screen, the bid in your hand. Nothing breaks — a bid is a bid whichever device places it, and the auction state is the same on both.
Worth knowing: your screen can be a moment behind on either device, so tap the amount the app offers rather than typing a number you read a second ago. What if two people bid at the exact same moment?
If it feels wrong on a tablet
Usually one of two things:
An old browser. Tablets get kept longer than phones and updated less. Which browsers work?
Desktop-site mode. Some tablets request desktop sites by default, which can give you a layout meant for a mouse. Turn it off for the site and it adapts properly.
More: what you need to watch a show, which browsers work, how fast does my internet need to be?.