[aepiepaey]

Mainly "cross platform". Many people would interpret that as [desktop] platforms, e.g. Linux/Windows/Mac OS. Especially if you weren't previously aware of what Flutter is.

Adding a "mobile" in there somewhere would be a significant improvement.

In addition "movie app" is a bit underspecified. Maybe it's for managing movies? Editing them? Playing them?

Especially when both confusions are combined, it can be easy to get the wrong idea of what the submission is.

[pvinis]

Yes but "app" is usually what you run on your phone, "application" is what you run on your computer, no?

[aepiepaey]

Back before the popularization of smart phones, it was not that uncommon to use "apps" as an abbreviation for [desktop] applications.

Of course, "apps" is usually used to refer to [mobile] applications today, but it's still used in the other sense.

[dang]

Ok we can just take "cross platform" out of the title.