divide both sides
doubtster: AI homework helper with step-by-step answers and video explanations
an AI homework helper that explains it on video
ask doubtsterchat is free$1.99 for 7 days and 3 videos. Cancel before day 7 and that's all you pay.
The Doubtster film, 22 seconds. Turn the sound on.
stuck to sorted, in three steps
Ask any homework question the way you'd ask a friend, in maths, physics, chemistry, biology or coding. Read the step-by-step answer. If it still won't click, watch it drawn out.
finally get the thing
Type the question exactly as it's stuck in your head. You get the answer in small steps, each one saying why, not a wall of text.
- ✓small steps you can follow
- ✓every step says why
- ✓chat is free, always
of text
doubtster weird ones
ask anything you're studying
Maths, science, economics, coding, accounting and the odd one your syllabus throws at you. Asking never costs a credit.
- ✓school, uni and exam prep
- ✓English, French, Spanish and Hindi
- ✓follow-up questions welcome
then watch it explained
Turn any answer into a short video. A voice talks you through it while the working is written out on the board, line by line.
- ✓voice and board in sync
- ✓diagrams drawn exactly
- ✓maths steps machine-checked
see a real one, start to finish
Four questions, four subjects. The voice, the board, the diagrams and the code in these videos all come from the Doubtster video engine.
Sample videos made with the Doubtster video engine. Videos for your own questions follow the same steps but can vary, and AI can make mistakes.
structured notes, with the diagram
Ask once and get clean notes with the diagram that goes with them, plus flashcards from the same page. Biology, chemistry, physics, coding and more.
Illustrative example of a generated note. AI notes can contain mistakes, so check important facts with your teacher.
Most of us have sat staring at a question at midnight, with a textbook that explains everything except the part we're stuck on.
We think a good explanation is patient, shows its working and doesn't make you feel slow for asking.
So that's what we're building: ask in chat, get the steps, and if it still won't click, watch it drawn out.
It's early, and AI can get things wrong. We'd rather say that up front than hide it. If it's an exam answer, check it with your teacher.
Illustrative examples of the kind of thing students ask. We don't have reviews to show yet, and we won't make any up.
doubtster, your way
Chat is free. Videos run on credits. Cancel anytime.
chat
- Unlimited text answers
- Step by step working
- Every subject
trial
- 3 explainer videos
- Renews as a paid plan after day 7
- Trial credits expire when the trial ends
monthly plan
- 30 video credits each month
- about $0.27 a video
- Credits reset monthly, no rollover
Yearly is $59, about 38% less than 12 months of monthly.
Forgot to cancel? That charge isn't refundable. Refunds only cover payment errors or account bugs on our side. Refund policy
frequently asked questions
what to know about doubtster, credits, and billing.
what is doubtster?
Doubtster is an AI homework helper. You ask a question, get a free step-by-step answer in chat, and can turn it into a short explainer video when you want to see it worked out on a board.
is chat really free?
Yes. Text answers are free and never use credits. Only generating a video uses a credit.
which subjects can I ask about?
Maths (algebra, calculus, statistics, trigonometry), physics, chemistry, biology, economics, accounting, finance and coding, plus most school and university subjects. You can ask in English, French, Spanish or Hindi.
how do the explainer videos work?
Doubtster turns an answer into a narrated video, usually one to three minutes long. A voice explains each step and why it works while the working is written on a board, with diagrams, graphs and code drawn in.
is using an AI homework helper cheating?
Doubtster is built for understanding, not copying: every answer shows the steps and the reason for each one, so you can do the next question yourself. Check your school's rules on AI tools for graded work.
how is doubtster different from Photomath or Chegg?
Photomath focuses on maths from a photo, and Chegg is known for textbook solutions and expert Q&A. Doubtster covers every subject in chat for free and can turn any answer into a narrated board video.
what happens after the $1.99 trial?
The trial lasts 7 days and includes 3 videos. If you don't cancel before day 7, it continues as a paid plan. Trial credits expire when the trial ends.
do unused credits roll over?
No. Plan credits reset every month. Top-up credits last 90 days and need an active paid plan.
can I get a refund if I forget to cancel?
No. Refunds only apply to payment verification failures or account bugs on our side. Read the refund policy.
can the answers be wrong?
Yes. AI explanations can contain mistakes, so check important answers with your teacher. Doubtster checks maths steps with a computer algebra system before a video is made, which catches many errors but not all.
stuck right now?
just ask it.
Chat is free, forever. When reading isn't enough, watch it explained on the board.
$1.99 for 7 days and 3 videos. Cancel before day 7 and that's all you pay.