Free to start. Free to stay.

Nothing to start, and nothing to stay. Your first 7 days have the whole of Leo, and starting needs no card. After them you stay on Free, at no cost, unless you choose a plan: Student at €12.99 a month or Master at €21.99. On Free Leo keeps teaching you for a few hours every week, with up to 3 goals and 5 materials, and your cards keep working as before. What a plan adds is Your knowledge (the map of what you know and the notebook Leo writes, which he keeps for you meanwhile), more time, more goals and a bigger library. Whatever you choose, your cards and notes can be exported at any time.

ChatGPT and Gemini are general assistants that help with almost anything, and both have study features you can open when you want them. Leo only tutors. He keeps a plan for each of your goals and knows what today needs, asks for your attempt before he shows a solution, brings back what you are about to forget, and keeps one notebook and one map of what you know across every subject. He also notices what keeps tripping you up, and checks it again before your exam.

Each plan holds an amount of time with Leo for the month: Student is enough for two hours every day, Master has room for long study days. Your plan page shows how much of the month is used, in plain words. You are told when four fifths are used, and if a month does run out you can add more for €5 instead of changing your plan. Reviewing cards, reading notes and your library never count.

No. He explains a new idea as fully as it needs. A problem you bring starts with your own attempt: he asks for a first step, makes the step smaller when you are stuck, and shows the worked solution after a real try. Send a photo of your working and he finds the first line that goes wrong.

Answers with a number are checked by the app, not by the AI. When Leo reads your own material he shows the page he read. A specific he cannot verify, such as a quotation, an exact figure or what your exam board requires, carries a "check this" mark. And "This is wrong" under any reply or grade reaches the people who make Leo. He is an AI and can be wrong: for anything your grade depends on, your course's own materials are the authority.

Yes, both ways. Paste a Quizlet export, a spreadsheet's CSV or an Anki text export into a conversation and Leo makes a deck of it. Your cards leave as a CSV file or as a file Anki imports, and your notes as Markdown files, whenever you like, with or without a plan.

Whatever you are working toward, said in one sentence: an exam with a date, a course at school or university, a skill, a project. Leo lays out a course for it from what he knows and builds on your own materials when you add them: a syllabus, lecture slides, a chapter, past papers. Mock exams follow the style of the past papers you bring.

The app is in English and in German. Leo answers in the language you write to him, whichever it is, and you can set the language he teaches in.

Learners from 17: school-leaving exams, university courses, professional exams, a language, anything you are working toward. You give your month and year of birth when you sign up. Paid plans are from 18.

Your account, conversations, notes and uploads are stored on servers in Germany. To write each reply, Leo sends what you write, the files you share and what he knows about your goals to OpenAI, whose models he runs on; it is not used to train AI models. You can download everything or delete your account at any time in Settings. The privacy policy, linked at the bottom of every page, has the details.

A current browser. Leo is built for a laptop or desktop and also works in the browser of a phone or a tablet. There is nothing to install.