For learners who study with AI

Practise whatever you're learning.

Learn with Claude, ChatGPT, Gemini or Grok as you already do. Heft turns each conversation into quizzes, flashcards and exercises you do on your phone, tablet or laptop, and keeps track of how far you've come.

Ask for an inviteI have an invite

Works with Claude, ChatGPT, Grok and any assistant that connects to remote MCP servers.

How it works

Your assistant teaches. Heft is where you practise and see your progress.

You keep learning in the chat you already use. Heft adds the part a chat can't do well: practice you can come back to on any device, at your own pace, with every try kept. Here is one German lesson, start to finish.

1In your chat I keep mixing up hätte and wäre. Can you explain it once more? Sure. Wäre goes with things that are, hätte with things you have… Heft this session Which kinds? Quiz, cards, speak? And how many questions? Quiz, 10 Here it is.
Konjunktiv II · 10 questions
2Practise in Heft
Question 5 of 10 · fill the gap

Wenn ich du wäre, würde ich früher anfangen.

Right. sein → wäre

One question at a time, on any device, also offline.

3Get your stamp Well done8/10

11 min · 3 better than last week

Ich ___ gern einen Kaffee.habe hätte
Das ___ schön!war wäre

Correct just these two, or try it all again later.

4Back in your chat hi 8 out of 10, nice. Both misses were wishes: “ich hätte gern”, “das wäre schön”. Let's do five of those out loud, then on to würde.

Your assistant already knows how it went. Nothing to copy.

Seven kinds of Heft

Each kind of practice has its own page.

QuizGaps and choices, one question at a time, with a score.
CardsYour own mistakes, back just before you'd forget them.
Q&AAnswer in your own words. Your assistant reads it.
ReadA short text to read before or after a lesson.
SpeakYour device reads a line aloud and you say it after.
PlanYour goals, your plan and how far you've come.
Brain dumpWrite down what you learned. Ask your assistant to check it, or keep it as a note.

Examples

Whatever you're learning, it fits.

Your assistant writes the questions from your own conversation, so they're about what you just covered, at your level.

Quiz · German B2

Moving to Berlin for work. Wishes and advice, polite requests.

Choose

Wenn ich mehr Zeit ___, würde ich öfter kochen.

hätte
habe
hatte
Right. haben → hätte
Quiz · Biology

Exam in three weeks. Photosynthesis, from the light reactions on.

Choose

Where does the Calvin cycle take place?

Thylakoid membrane
Stroma
Mitochondria
It's the stroma. The light reactions happen on the thylakoids.
Q&A · Rust

Learning to code after work. Ownership and borrowing.

In your own words

Why doesn't this compile?

let s = String::from("hi"); let t = s; println!("{}", s);
s moved into t, so s can't be used any more.
Right. To keep both, clone it or borrow with &s.
Speak · Nursing German

First week on the ward. Phrases for patients.

Say it out loud

Haben Sie Schmerzen? Zeigen Sie mir, wo.

▶ Listen
Again later
I said it

Every try counts

See what you got wrong, then fix just that.

A finished Heft gets a teacher's stamp and a list of what to fix. Correct those few without redoing the rest, or start over and compare with your last try.

History

Learn with your favourite assistant. Practise in Heft, and keep every day in one place.

The calendar marks each day you practised. Tap one to open what you did that day. Search finds any Heft or brain dump, whichever assistant made it.

Why Heft

Made for the way you already learn.

No second AI to pay for

Heft does not teach. Your assistant does the teaching, and Heft keeps the practice. Heft uses an AI model only to check written answers.

One workbook, any assistant

Start in Claude, carry on in ChatGPT. It all lands in the same Heft.

Works offline

Save your Hefts on your device and practise on the train. Answers sync when you're back online.

Privacy

Your workbook, not ours.

Only you and the assistants you connect can read your Heft. Read exactly what Heft keeps.

  • No ads, no trackers, no analytics, and nothing loaded from other companies.
  • Heft never sells your data and never uses it to train AI. Your own AI assistant follows its provider's rules.
  • Download everything as one file, whenever you like.
  • Delete a subject or your whole account, effective immediately.
  • Disconnect any assistant with one tap.

Questions

Before you ask.

What does it cost?

Nothing while Heft is in its test. You need an assistant that can connect to Heft, such as Claude, ChatGPT, Gemini or Grok, on a plan that allows connectors.

What can I learn with it?

Anything you learn in a conversation: a language, maths, programming, music theory, an exam. Your assistant chooses the questions from what you just covered.

How do I connect my assistant?

Once, in its settings: add Heft as a connector with one web address and sign in with your invite code. It takes about a minute, and the steps are on the page you get with your invite.

Does Heft listen to me or record my voice?

No. For Speak, your device reads the line aloud and you say it yourself. Heft records nothing.

Is there an app to install?

No. Heft runs in the browser on your phone, tablet or computer. On a phone, add it to your home screen and it opens full screen like an app, also without a connection. If enough learners ask for an app in the App Store or Google Play, we will build one.

Ask for an invite.

Heft is in a small test with a few learners at a time. Leave your email and we'll write when there's a place for you.

Your address is used for nothing else and deleted when you write to contact@quietflare.net. Privacy