Doubtnut is the app most Indian students know — take a photo, get a video. DoubtPay AI is newer and works differently: type or photograph any question, get a written step-by-step answer with a diagram, and pay one credit per answer. Here is a fair look at both.
How each one works
Doubtnut matches your photo against a huge bank of already-solved questions and shows a video solution. If your question is in the bank, it is fast and free (with ads). If it is not, you may get a similar question instead of yours.
DoubtPay AI reads your exact question — even your own wrong attempt — and writes the solution fresh, step by step, in the language you choose. Where a figure helps, it draws a labelled diagram. Each successful answer costs one credit; failed requests refund the credit.
Stuck on a question? Ask it here and get a step-by-step answer in seconds — pay only per answer, no subscription. Ask your doubt now →
Side-by-side
| Feature | Doubtnut | DoubtPay AI |
|---|---|---|
| Price | Free with ads; paid plans for classes/tests | ₹9/15 credits, ₹49/100, ₹99/250; no subscription |
| Your own question | Works if similar question exists | Always answered fresh |
| Check my attempt | No | Yes (paste your working) |
| Languages | Hindi, English videos | 12 Indian languages, text + read-aloud |
| Diagrams | In video | AI-drawn labelled SVG in answer |
| Exams | School, JEE, NEET | Class 6-12, JEE, NEET, CUET, SSC, banking, railways, UPSC |
| Extras | Video courses, test series | Hints, revision plan, practice questions, flashcards, mind map, animated tutor (₹9) |
Where Doubtnut wins
Free video solutions for almost every NCERT and popular reference-book question, plus full courses and mock tests. If you want a complete coaching replacement, Doubtnut does more.
Where DoubtPay AI wins
It answers your question, not a look-alike. It checks your attempt, explains in Bengali or Tamil if that is how you think, and costs less than 50 paise per doubt on the ₹49 pack. There is no auto-renewal and credits do not expire on a schedule.
Verdict
Use Doubtnut as a free video library. Use DoubtPay AI when the free bank does not have your question, when you want your own method checked, or when you want the explanation in your mother tongue. Many students use both. See the full list of options in our post on the best AI doubt solving apps in India.
Stuck on a textbook or mock-test question?
Type the exact question from your book, pick your class and language (Hindi, Hinglish, English or 9 more), and ask your doubt on DoubtPay AI. You get step-by-step working with a drawn diagram where it helps. No subscription — credit packs from ₹9, and unused credits stay in your account.
Frequently asked questions
Is DoubtPay AI a Doubtnut alternative?
Yes for doubt solving. It is not a video-course or test-series platform; it focuses on answering your exact question with steps and diagrams.
Is Doubtnut fully free?
Doubt search is free with ads. Courses and some features are paid.
Does DoubtPay AI have a monthly plan?
No. You buy a one-time credit pack; one answer uses one credit and packs never auto-renew.
Stuck on a question? Ask it here and get a step-by-step answer in seconds — pay only per answer, no subscription. Ask your doubt now →