Zuoyebang: AI homework grading and textbook-synced tutoring for K-12

Zuoyebang is a study app for K-12 students and their parents in China. It puts homework checking and day-to-day tutoring in one place: photograph a page and the homework comes back graded and explained, search a single problem or a full page for a worked solution, and practise along the textbook chapter, with essay coaching, application planning and a set of everyday study tools alongside.

In practice it fills two roles at once: a second pair of eyes for parents, and an on-demand answer for students. The materials say the platform draws on a 1.9 billion question bank plus AI. Day to day that means four jobs - find the problem, grade the homework, locate the weak spot, then close it with chapter-level practice.

What it does

• AI question answering. Search one problem, a full page or an essay. Answers come from the 1.9 billion question bank, with the reasoning broken down, follow-up questions on weak points and related concepts suggested, so one mistake leads to the next thing worth learning.
• One-tap grading. Grades assignments across all subjects, including mental-math drills and essays, and attaches error analysis plus a walkthrough of the original problem.
• Textbook-synced practice. Follows the textbook chapter, flags exam priorities and pushes matched exercises and unit tests, closing the learn-practise-test loop.
• AI writing. Tracks the K-12 Chinese curriculum and drafts a full essay, an English piece, or only an opening and closing; essay grading adds a six-dimension rating, whole-text comments and sentence-level correction.
• Application planning. Builds a reach-match-safety shortlist of universities from admissions data.
• Video explanations. The materials cite 93% coverage, matching the exact or a similar problem to a teacher's video walkthrough.
• Everyday tools. Photo translation between Chinese and English with word and sentence lookup, a dictionary, mental-math drills under 100 with printed or on-screen practice, and a calculator that shows steps for roots, equations, trigonometry and factoring.

A full homework check, step by step

1. Install the app, sign in and set the grade and textbook edition first. Synced practice and exam priorities follow that setting, so a wrong edition means wrong recommendations.
2. Photograph the finished page and choose grading. Read the flagged errors first, then open the explanations; the reasoning is worth more time than the score.
3. For anything unclear, search the single problem or open the video, then ask the child to restate the method in their own words.
4. Open synced practice and run a set of exercises or a unit test for the current chapter, so the gap is fixed while it is still fresh.
5. For essays, have the student write first, then use the six-dimension rating and sentence corrections to revise - not the other way round.

Where it fits

• Parents checking homework after work: screen for errors by photo, then read only the explanations that matter.
• Students filling gaps: a topic missed in class, revisited with synced practice plus video.
• Exam revision: unit tests and priority flags to decide what to review.
• Essay practice: start with openings and closings, move on to full pieces, watch the ratings move.
• Quick utilities: a word, a sentence, a set of drills, a complicated expression - without switching apps.

Limits worth knowing

• The materials give no official website or pricing, so which features are free and which need a membership has to be checked inside the app.
• The 1.9 billion question count and the 93% video coverage are the platform's own scale claims; they do not guarantee a solution or a video for every problem.
• AI explanations can be wrong, more often on open-ended, multi-solution and new question types. Treat grading as a lead, not a verdict.
• Photo grading depends on the photo: low light, a curved page or messy handwriting all hurt recognition.
• Application planning rests on admissions data the materials describe only as authoritative, without naming sources or years. Verify against the provincial exam authority and each university's current prospectus.
• The six-dimension essay rating is a reference; schools do not grade to one shared rubric.
• A study tool cannot replace studying. Copying explanations makes homework look finished and teaches nothing.

Frequently asked questions

Who is Zuoyebang for?

K-12 students and their parents: students search problems, read explanations and run synced practice; parents grade homework quickly and see where the child is weak.

Can it grade a whole page?

Yes. The materials describe full-page search and one-tap grading across all subjects. A full-page photo saves time but needs better light and a flatter page.

Can I trust the AI answers?

Use them as a line of reasoning, not a final answer. Where they conflict with the textbook or the teacher, follow the textbook and the teacher.

Is anything free?

The materials carry no pricing or membership details, so this cannot be confirmed here. Check what the app itself displays.

Can I copy the application shortlist?

Not directly. It is a reference; admissions plans, subject requirements and rules change every year and must be checked with official sources.