is it mandatory to make Universal App for Keyboard Extension in IOS?

Question

I have developed a keyboard extension for iphone and submitted to Appstore. But it got rejected due to- 2.10: iPhone Apps must also run on iPad without modification, at iPhone resolution, and at 2X iPhone 3GS resolution.

Do I need to make universal App, or just make it scalable up to ipad and submit to App store?

Answer 1

You don't need to make it universal. It only needs to run on the iPad at the iPhone resolution.

SOURCE: WWDC sessions

Answer 2

No, you don't need to. As the rejection reason said, if it can run on iPad with iPhone resolution, it's fine.