Duowenwen

Ask away. I'll explain.

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01

How it works

Stuck on homework? Snap a photo. You get a reference answer first, then a step-by-step explanation, then you can follow your curiosity and keep asking.

  1. Snap it

    Stuck on a problem? Take a photo of it. Worksheets and test papers are fine, up to 9 photos at a time.

  2. I'll explain

    Within a few minutes: it reads the problem carefully, works out the answer, then walks you through it the way a tutor would.

  3. Keep asking

    Each explanation ends with two or three follow-up questions. Tap one, and the answer ends with another question, so you can keep going.

02

A real question, explained

A real question, explained

Question

A rope 16 cm long is first made into a rectangle 7 cm long and 1 cm wide, then into a square with sides of 4 cm. Is the perimeter the same both times? Is the area?

AnswerReference answer

The perimeter is the same, but the area is not.

  • Rectangle: perimeter 2×(7+1)=162\times(7+1)=16 cm, area 7×1=77\times1=7 square cm
  • Square: perimeter 4×4=164\times4=16 cm, area 4×4=164\times4=16 square cm

Explanation

Perimeter is the distance around, and area is how much space is inside. They don't measure the same thing.

Try it with this rope. Make a long thin rectangle and there's barely room for anything in the middle. Make a nice square and you can fit much more inside. The rope hasn't changed, but the space inside has.

Writing it as formulas makes it clearer: for the rectangle, the perimeter is C=2(a+b)C=2(a+b) and the area is S=a×bS=a\times b. Both times a+ba+b is 88, but 7×1=77\times1=7 while 4×4=164\times4=16, so the square's area is more than twice the rectangle's.

Then keep asking

With the same perimeter, which shape has the largest area?What if you make the rope into a circle?

This question and its explanation come from the public question map

03

Keep asking

"Keep asking" is what happens after the explanation: each one ends with two or three follow-up questions. Tap one and the answer ends with another question.

The questions you've asked join up into a question map. Other tools stop at the answer. We start there.

Browse the public question map

04

Frontier math · see it to get it

Problems from graduate school, made clear in a picture.

Kakeya needle · 1/6

A needle is just a line. The area is everything it sweeps over

0.000Area swept
Pieces
Cut into 4096 pieces ×3

How much room does it take to turn a needle around? Drag, tap, and work through a century-old math problem in six steps. Full screen, with sources

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05

For parents

We explain the problem; we don't do your child's homework or hand it in. No nagging, no grades, no comparing you with anyone.

Homework photos are kept for up to 90 days and only the operator can see them. We don't use them to train our own models; third-party AI services process them under their own policies. See the privacy policy.

Pages for parents

06

About Duowenwen

Duowenwen is an AI homework helper for students aged 10-18 and their parents. When homework gets you stuck, take a photo on your phone and I'll explain the problem. Then you can keep asking until it makes sense.

What can Duowenwen help me with?

It explains the problem to you; it doesn't hand in your homework for you. When your child gets stuck on homework in the evening, they send a photo of the problem and within a few minutes get the answer and an explanation. The answer is checked against the textbook text, with the page number. The explanation talks like a tutor and goes one step at a time. Afterwards your child can keep asking, and asking the same thing again and again is never a bother.

What happens after I take a photo?

Two steps: get the homework done, then keep asking. Step one: photograph the worksheet or test, up to 9 photos at a time. We turn the problem into text, answer it, then explain it, usually in 3-6 minutes, and follow-up questions don't need a new photo. Step two: every explanation ends with 2-3 follow-up questions. Your child taps one, the reply ends with a new question, and they can go as far as they like.

What else can I do once it's explained?

Keep asking. That is what "keep asking" means here. After a problem is explained, your child follows the follow-up questions, and the questions they ask join up into a question map they can save or share with classmates. In the family view, parents can see where their child got stuck this week and what the question map looks like. You won't see scores or rankings, because we don't rank anyone.

Won't my child just copy the answers?

We give the answer first and then the explanation, and we don't hide that. The homework is due tonight, and getting the problem done is a real need. But the answer is checked against the textbook with a page number, and the explanation goes step by step, so your child sees why the problem works that way, not just a result to copy down. The follow-up questions are what set us apart from a plain answer-lookup app: others stop at the answer, and we start asking from the answer.

Does it cost anything?

Your first login on a new account comes with 100 credits, enough for one full problem, and you only get them once. After that, one problem costs 60 credits, which includes the explanation and 3 follow-up questions; each extra question is 8 credits, and a chat reply is 4; in chat mode, the first reply to your photos is 8 credits for 1–3 photos, 12 for 4–6 and 16 for 7–9, then 4 per reply. If a problem can't be explained, the credits are refunded automatically. Credit packs are priced in US dollars and paid by card; see the pricing page for prices. The family view shows parents the question map and this week's common slip-ups. There are no ads and no rankings.

Can I trust it with my child?

Five things, in plain parent language. It can't be teased into saying things it shouldn't. It never says "you should know this by now". Photos are kept for 90 days at most and only the operator can see them, and we don't use them to train our own models (privacy notice). It doesn't write or hand in homework for your child. And you can see where your child got stuck this week. To see how we do all this, read the page called "How we do it".

How do I get started?

Go to duowenwen.ai and sign in with an email code. Families outside China can sign in with a Google account. Then photograph one problem you're stuck on tonight. You don't need to understand it first, and you don't need to teach your child how to ask. Try one problem and you'll see.

Next: parents, read the page for parents; students, read the page for students; then take a photo of one problem.

Stuck on one tonight? Snap it.

Sign in with just an email and your first question is free. Photos are kept for up to 90 days and only the operator can see them. See the privacy policy.

Back to the top, try a question

One photo question is 60 credits, explanation included; follow-ups cost 4 credits each for the first 3 on a question, then 8. New accounts get 100 free credits, once. Pricing