I Built My Own Duolingo. You Can Too.

I want to build my own language tutor app in this folder. Before we write any code, interview me and write a file called CLAUDE.md that will be the tutor's memory about me.

Ask me one question at a time, wait for my answer, then ask the next one. Cover:
1. The language I am learning and the exact variety: [your language, for example European Portuguese, not Brazilian].
2. My level: [your level, for example A2, B1 or B2].
3. Why I am learning it, in my own words.
4. My 5 real situations where I need the language: [your situations, for example pharmacy, my landlord, client calls]. For each one, ask who I talk to and what usually goes wrong.
5. The tone I want from the tutor (for example warm, short, a little humour, never childish).
6. The language I want explanations in: [your explanation language].

Then write CLAUDE.md with these sections: About me, Language and variety, Level, Why I learn, My situations, Tone, Correction rules.

Use these correction rules exactly:
1. Never correct me while I am speaking or typing an answer.
2. After I finish, give only ONE correction: the mistake that matters most for being understood.
3. First say what was clear, then show "You said" and "Try this", then one short rule in plain words.
4. Save every correction as a mistake to practise later.
5. Use only words and grammar that match my level and my variety.

When you finish, show me the file and explain in plain words what each section is for.

Read CLAUDE.md. Build the first version of my tutor app, called [app name]. Keep it small and simple.

What to build:
1. A small local web app I open in Chrome on my computer.
2. An onboarding screen titled "First, tell me about you." with three questions: my level (chips: A2, B1, B2), why I am learning (one line of text), and where I need it most (chips made from my situations in CLAUDE.md). A button: "Let's practise your real life".
3. A Talk screen. The tutor opens with one question in [your language] about my real day, linked to one of my situations, for example "How did the conversation with your landlord go?". For now I answer by typing. Voice comes later.
4. Three tabs at the top: Talk, My mistakes, Real messages. Only Talk works for now. The other two can say "Coming soon".

The brain: the tutor's replies must come from Claude on my Claude plan, not from a separate paid API key. Choose the simplest way to do this on my computer. If anything needs to be installed, ask me first, then install it for me and explain in plain words what it is.

Design: clean and calm. White background, one blue accent for buttons, a yellow highlight for selected chips, big readable text.

When you finish, start the app for me, tell me how to open it again next time without typing any commands, and explain in plain words what you built and which file does what.

Now add the correction logic, following the Correction rules in CLAUDE.md.

1. While I answer on the Talk screen, show no corrections at all. Show the line "I'm listening. Take your time. No corrections while you speak."
2. When I press Done, the tutor replies with a card titled "One small correction." It shows one sentence about what was clear, then YOU SAID with my sentence and the wrong word crossed out, then TRY THIS with the fixed sentence and the fixed word highlighted, then one short rule in plain words.
3. If my answer has no real mistake, say so and give a small compliment instead. Never invent a mistake.
4. Save each correction to a file called mistakes.json in this folder, with: date, situation, what I said, the fix, the rule, and how many times I practised it.
5. Under the card add a button "Say it once more" so I can type the fixed sentence again, and tell me if I got it right.
6. Make the My mistakes tab work: a simple list of saved mistakes, newest first.

Test it with 3 example answers that each have one mistake, and 1 answer with no mistake. Then explain in plain words what you changed.

Add next day practice to the My mistakes tab.

1. When I open the app, check mistakes.json. Mistakes saved yesterday or earlier that I have not mastered appear in a section called "A little practice. Just for you." with the line "Yesterday's mistake. Today's progress."
2. For each mistake, make one gap fill exercise built from my own sentence, for example "Ontem ___ com o meu senhorio." with 3 options: the right form and two close wrong forms.
3. Generate exercises ONLY from my saved mistakes. No random textbook sentences.
4. When I answer right on two different days, mark the mistake as mastered and stop showing it.
5. Keep each session short: maximum 5 exercises.

Explain in plain words how the app decides what to show me each day.

Make the Real messages tab work.

1. A box where I paste a message I need to send in [your language], for example to my landlord, a doctor or a client.
2. The tutor fixes it gently: it keeps my meaning and my voice, fixes only real mistakes, and matches the right politeness for that person. Show my version and the fixed version with the changes highlighted, plus one line about the most important change.
3. Under the fixed version show "Before you send it, say it out loud once." and a button "Practise my message" that lets me type or say it and checks it.
4. Save each message with the date, so I can practise it again later.

Do not send anything anywhere. This tab only prepares messages. I send them myself. Explain in plain words what you added.

Add voice to the Talk screen and to Practise my message, using the speech features built into Chrome.

1. A microphone button: I speak, the app writes down my words, and nothing is corrected until I press Done.
2. A play button next to each tutor message that reads it out loud in [your language and country, for example Portuguese as spoken in Portugal].
3. Keep typing as a fallback everywhere. If speech recognition fails or is not available, show the text box with a short friendly note.
4. Set the recognition language to my exact variety from CLAUDE.md.

Tell me in plain words what works, what limits I should expect in Chrome, and how to test it.