Question.AI: Zuoyebang's study assistant for photo solving, PDF Q&A and translation

Question.AI is an AI study assistant from Zuoyebang, aimed at students, working professionals and anyone curious. It keeps the interface deliberately simple and returns immediate answers, supports translation across more than 140 languages to remove language barriers, offers a smart writing mode that improves text, and includes a maths calculator for harder expressions. It also covers photo-based problem solving, text summarising, grammar checking, formula recognition, AI chat, PDF handling and round-the-clock help.

The design logic differs from most study tools. Instead of packaging content into a course you work through from the beginning, it assumes you already hold a specific problem, a paragraph of foreign text, or a PDF you cannot finish, and then helps around that object. That is why the entry points are mostly upload and capture — a photo, an image, a PDF, a block of text — rather than a chapter list.

The nine features look scattered but fall into three lines: solving (photo solving, formula recognition, calculator), reading and writing (summaries, PDF handling, grammar, smart writing), and language (translation and 140-plus language support). The AI chat and the 24-hour assistant run across all three as the always-available layer. The three lines are unpacked below, with the fitting occasions and the known limits.

Nine features along the solving, reading and language lines

Photo solving and formula recognition

Photograph a problem and the system recognises the content and returns an answer. The companion formula recognition is OCR-based and reads mathematical expressions and text from images and PDFs — a detail that matters, because once a formula is misread every following step is wrong. For printed workbooks, blackboard work and screenshots, a photo beats typing, and it sidesteps the awkwardness of formula input methods.

Calculator for harder expressions

A built-in maths calculator handles more involved problems. It complements photo solving: photography suits a problem already on paper, the calculator suits checking one step yourself. When you need repeated trial calculations, typing is faster than taking another picture.

Summaries and PDF handling: thinning out long material

Text summarising quickly conveys the main content of a book or article, while PDF handling accepts an uploaded PDF, produces a summary and answers questions about the document. Together they fit a workflow like this: drop in a few dozen pages, take the summary, then keep asking about the paragraphs that remain unclear instead of grinding from page one.

Translation across more than 140 languages

Translation covers over 140 languages for cross-language study and exchange. In practice there are two uses: translating a foreign passage wholesale in order to read it, and drafting in your own language first, then translating as a reference when writing in another. Multilingual support also lets you ask the same question again in a different language, using the two renderings to check whether your understanding holds.

Grammar checking and smart writing

Grammar checking locates errors in detail and suggests corrections; smart writing improves the text overall. The first corrects, the second rewrites — run grammar first to clear hard errors, then smart writing to adjust expression. The two produce different results, and blending them makes it hard to see what actually changed.

AI chat and round-the-clock answers

AI chat lets you interact with the assistant for immediate help, and the 24-hour assistant emphasises all-day answers. This layer catches the questions that belong to no single exercise: why a concept is defined that way, how two methods differ, whether a step can be skipped. Late at night, it is the one still online.

A typical path through the app

1. For a problem you cannot solve, photograph it, take the answer and the reasoning, then redo the calculation yourself to confirm you understood.
2. For material too long to finish, upload the PDF or paste the text, take the summary first, then ask about the passages that remain unclear.
3. Translate foreign material directly; when writing in a foreign language, draft in your own first, translate, then run a grammar pass.
4. After finishing a piece, clear errors with grammar checking, then adjust expression with smart writing.
5. Push conceptual questions into AI chat, at any hour.

Who it suits

• School and university students: photo solving, formula recognition and grammar checks around homework and preview.
• Exam candidates: people working through large volumes of exercises who need to verify reasoning quickly.
• Professionals: reading foreign material, writing English email, digesting long PDFs.
• Cross-language learners: reading the original with translation support, then restating it in the target language.

Limits worth knowing

• The source does not disclose subscription pricing, free quota or paid tiers. Confirm the actual scope inside the app.
• Photo solving returns an answer and a line of reasoning, not a guarantee of matching the textbook method or an exam's marking scheme. Treat it as a checking tool rather than a substitute for practice.
• Formula recognition depends on OCR; messy handwriting, poor light or dense layouts can produce misreads, so important calculations should be verified by hand.
• Translation and grammar suggestions may miss on technical, legal or medical wording; formal documents still need human review.
• The source does not state quality differences between languages, PDF page or file-size limits, or which operating systems and platforms are supported.

Frequently asked questions

Who makes Question.AI?

It is an AI study assistant from Zuoyebang, aimed at students, professionals and curious learners.

How many languages are supported?

The stated figure is translation support for more than 140 languages, for cross-language study and exchange.

Can it handle PDFs?

Yes. Upload a PDF to get a summary and to ask questions about its content.

Can photos pick up formulas?

Formula recognition is OCR-based and reads mathematical expressions and text from images and PDFs, though poor handwriting or capture quality needs manual checking.