In design for iPad alternative

As said elsewhere, If you're looking for something to open InDesign Document (.indd) or InDesign Template (.indt) files, you're going to need Adobe InDesign.

But if you're looking for a relatively robust page layout program for the iPad, you may want to consider Affinity Publisher for a short-term fix. Fonts, of course, will also be an issue (and limitation), but you can at least knock out some rudimentary layouts on your iPad that can be massaged on the desktop later.

Hope this helps,

Randy

There are alternative design apps, but only InDesign can open INDD files.

It's not a multi-page application but Illustrator (and Photoshop) for iPad might be possible solutions.