Three levels, taken in order.
Each level is a full course with its own units, workbooks and end test, general English first, with a parallel Business English track for every level. Full access is €29/month; the first few Tongue lessons are free to try before you subscribe.
Tongue
Grammar and vocabulary are the whole focus here: the foundation everything else is built on. Videos teach basic grammar and vocabulary separately, backed by vocab lists and grammar sheets that both supplement the videos and test what's been learned.
Teeth
Small conversations, reading and writing. Grammar is still there but no longer the main focus — most videos are reading and writing practice, plus a few for the harder grammar points that show up at this level.
Lips
Deep conversation, listening, reading and analytical writing: using English in real life rather than studying it. Different accents, real news and documents, and writing about literature, language and other topics.
Business Eng
The same units and structure, with vocabulary built around workplace English.
Business English
Every level above is repeated as a parallel Business English track once its general-English version is finished, included in the same €29/month subscription.