Trivial things that make you annoyed beyond expectations?

[ColinJ]

No there won't be. If an app can be used in either, then it usually detects the orientation of teh tablet, and automatically adjusts.

I have a couple of apps which do tat, and I try to avoid them.

I suspect such apps were probably written with phones in mind, which most people tend to use in portrait mod most of the time, rather than tablets which are quite hard to use in portrait mode, with standard cases.

That dictionary app popped up in my Chrome browser but I happen to have bought the self-contained app for use on my phone, and you are right - that insists on portrait mode.

I should confess something - I have written an Android app (a puzzle game) and that currently also only works in portrait mode. I will change it!