How our courses are made

Every course carries one of two labels:

• Reviewed — built and checked by a human. We're confident in the content.
• Beta — drafted with AI assistance from a shared course blueprint, then validated by automated checks. A native speaker has not yet signed off on every line.

1. One shared blueprint. Every course follows the same skeleton — the same units, skills, and lessons — so the structure is consistent and reviewable. Only the language content differs.
2. Offline authoring. Exercises are written ahead of time into version-controlled files, never generated live while you learn. Nothing you do sends your answers to an AI.
3. Automated validation. Each exercise is checked against a strict schema before it can be published — every multiple-choice question has the right number of options, every answer is non-empty, and so on.
4. An honest confidence report. Each beta course ships with notes on what we're confident about and what needs a native speaker's eye — gendered words, formal vs. informal register, tones, scripts, and idioms.
5. It stays in beta until a human signs off. A beta course is never silently promoted. A wrong lesson is worse than a missing one, so we flag uncertainty loudly instead of hiding it.

• It doesn't cost anything extra.
• It isn't machine-translated word-for-word.
• Your progress, streak, and saved words are just as real as in any other course.

See something wrong? Tap the flag at the top of any lesson. Tell us if the answer is wrong, there's a typo, it sounds unnatural, or it's inappropriate. Those reports go straight to our review queue and are how beta courses become reviewed ones.

• Audio. Beta courses have no listening exercises yet.
• Deep grammar notes. Some courses still have these on the way.