Xai Du Ký

RedDotEdu

About this app

Xai Du Ky is a math-solving companion for Vietnamese students. It's not a solution generator — Xai Du Ky accompanies you step-by-step, asks questions at the right time to help you figure things out, and explains things in student-friendly language.

SNAP TO UNDERSTAND

• Take a picture of the problem, choose an image from your device, or upload a PDF file — the app automatically recognizes the problem, including text, formulas, and diagrams.

• Crop and adjust the problem area before submitting. Even if a page has multiple problems, you can still select the one you need.

• No image? Type the math formula directly into the keyboard or describe it verbally.

LEARN TO UNDERSTAND, NOT TO COPY

• Choose how you want: receive step-by-step guidance, get hints to continue on your own, or review your solution.

• Each step is clearly explained; no skipping steps.

• Point out the mistakes directly, along with corrections — no judgment, no rushing.

LOOK UP CONCEPTS DIRECTLY IN THE SOLUTION

• Mathematical concepts appearing in the solution are clickable: theorems, formulas, rules — short, concise explanations are available, following the Vietnamese high school curriculum.

• Geometry problems have illustrative diagrams reconstructed from the problem, making them easy to understand.

MANAGE YOUR LEARNING

• All conversations and completed assignments are saved and can be retrieved by content.

• Mathematical formulas are displayed clearly and correctly.

• Usable in both Vietnamese and English, switch at any time.

PACKAGES

Xai Du Ky uses "Sand" as the unit for each question. The free package has daily Sand refills with a weekly limit. The Premium package increases the daily and weekly Sand limit, for those who study more.

Premium offers four subscription periods: 1 month, 3 months, 6 months, and 12 months. The price for each plan is displayed directly in the app before you confirm payment.

All Premium plans automatically renew for the selected period. The renewal fee will be charged within 24 hours before the current period ends, unless you turn off automatic renewal at least 24 hours prior to that time. You can view, manage, or cancel renewals in Apple's Subscriptions section at any time.

Terms of Use: https://xaiduky.com/service-conditions

Privacy Policy: https://xaiduky.com/privacy

SUPPORT

Email: [e-mail] — Hotline: [phone]

Operated by: RedDot Edu Co., Ltd.

What’s new

Chúng mình đã nâng cấp trải nghiệm trò chuyện và hiển thị lời giải mượt mà hơn, đồng thời sửa một số lỗi để ứng dụng chạy ổn định hơn. Cảm ơn bạn đã đồng hành cùng Xai Du Ký.