Memorizer is a great memorization tool for almost anything you want to learn and remember. For example languages, history dates, formulas. Just create cards and revise them when memorizer suggests or whenever you want.
The main principle of memorizing is a revision, just create cards which will help you to remember and let Memorizer notify you about revisions.
Updated to Swift 4.2.
Fixed minor bugs.
Up to six family members will be able to use this app with Family Sharing enabled.