Yes, I did. I created some small apps for myself.
So far I haven't had any difficulties with developing mobile apps. The only problem I had was a lack of time.
Honestly, I don't have a lot of favourite apps, but I can mention: Total Commander, Root Explorer - really useful, functional and easy to use file managers. Another app is Telegram - simple, customisable, secure messenger. And recently I've installed WiFi ADB app, which allows me to install my apps over Wifi without cable, it is very convenient and I really like it.
I started working on it probably in February 2017 and I created it primarily for myself (later I shared it with my friends) and since then I've been making some small improvements.
Before deciding to create this app, I realised that I needed something that would help me to store words and phrases. It's not convenient to store everything in notebooks, as you can't find something quickly and sort everything. So I decided to create the app! I started studying in Poland, but I'm originally from Ukraine. So it was very important for me to learn this language as quickly as possible. Later I decided to improve my English (I've litterally fallen in love with this language) so it was additional motivation for me to improve my app to learn this language faster.
I think that this app is better than similar apps because: it is simple, it looks better, it has more functions (creating many vocabularies, sorting, searching, grouping, self-testing), and of course it's better because the developer is such a great man, who is always ready to improve his app :)
I'm going to slightly change the way words are shown in my vocabulary, so it would cause fewer problems for users.
I want them to use this app, share it and let me know if they have any ideas for improving it.
About App: Very simple and useful app that will help you store and learn any words and phrases that you'll add to it!
Date: April 27, 2018
Developer: Саша Серегин