Linguisticat

As a language learning extension for Safari on iOS, Linguisticat works on the pages you already read instead of asking for a separate study session.

Linguisticat replaces words you already know with words in your target language as you browse, so new vocabulary shows up inside ordinary web text.

The idea is repeated exposure over time, which the tool describes as spaced reinforcement.

You can work with more than one language at once, and with several levels at the same time.

That helps if you are learning a beginner language next to a more advanced one.

The catch is the platform.

Linguisticat runs only in Safari on iOS, so it does nothing if you browse in another app or on another device.

It also teaches through reading rather than drills, which is a different habit from using a flashcard app.