We use data from Wiktionary so it may contain inaccuracies.
Adding words to your personal dictionary
To search for a word in the general dictionary, click on the button in the lower right corner. To search for multiple words, click the plus icon in the top toolbar. You can change the translation language while searching. Clicking on the heart icon will add the word to your dictionary, which is located in the Words item of the main bottom menu.
The app also has sets of popular words. You can find them in the Sets item of the main bottom menu.
Customizing word info
Clicking on a word will open its details. If necessary, you can change the translation and notes of the word.
Word learning process
In the Learning item of the main bottom menu, you can learn words from your dictionary using a learning system similar to ANKI. In the app settings, you can also configure learning notifications and word progress.
In the premium version, you can add an unlimited number of words (the free version has a limit of 50 words).
You can find more information about purchases and subscriptions here.