If you managed to finish the app, you weren't very depressed. Depression acts primarily on willpower. The bad feelings come as a consequence of not being able to get anything done.
* major depressions with a single episode (F32 - this is probably what you had in mind)
* recurrent episodes of various degrees (F33 - this includes seasonal affective disorders, i.e. recurring winter blues)
* Persistant mood disorders like dysthymia, where your baseline mood is dysphoric (F34.1)