Errly: AI Tutor & Error Book
All Subjects: Scan & Review
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
Turn homework and test mistakes into your next study session. Errly 3 adds biology, custom subjects and five more languages, from schoolwork to university courses.
Turn today’s mistakes into tomorrow’s review.
Errly is an AI error notebook for students aged 13+, from middle and high school to university.
Save questions from homework and tests, understand the steps and practice with your own material.
From daily homework to exam week
After class, save the questions you found difficult and note what went wrong. Before a test, bring them back for focused review. At university, create subjects for your courses and keep problem sets and lecture questions together.
Capture and organize
• Capture handwritten questions: photograph them or write a question directly in the app, then check and edit the recognized text
• Also scan printed questions, import images and PDF pages, or type your question
• Keep multi-page passages and diagrams connected to their questions
• Save the original, your answer, notes and the reason for a mistake
• Correct the detected subject or save as Unclassified for later
Make room for every subject
Math, physics, chemistry and biology include subject-specific guidance and topic organization. Chinese language and literature, English, history, geography and politics are also built in. Create custom subjects for literature, other languages, university courses or professional exams, then organize them with your own labels.
Understand, review and practice
• Follow guided explanations of the reasoning
• Ask follow-up questions with Pro or Ultra; explore another approach when suitable
• Revisit saved questions with flashcards and spaced review
• Generate practice from your mistakes; with Ultra, choose a supported question type, such as multiple choice or short answer, when suitable for the source question
• Find questions by subject, keywords and labels; Ultra adds search by meaning
• With Ultra, build printable worksheets from saved original questions or suitable AI-generated practice
• Export questions and learning reports as PDF or Word, within your export allowance
• Practice on paper with A4 PDFs: advanced templates leave room for working and put solutions on separate pages, with an eligible subscription or export credit
Learn in eight languages
The interface and explanations support English, Simplified Chinese, Japanese, French, German, Korean, Spanish and Portuguese. Choose how you read the explanation while keeping the original question unchanged.
Keep your notebook across devices
With Pro or Ultra, sign in and enable cloud sync to sync subjects, questions, images and progress across supported devices, within your cloud storage allowance. Saved local content remains available offline; AI requests require an internet connection. You can export or delete your data.
AI explanations and generated practice depend on the question and the material provided. Automatic checking is available for supported question types; open-ended answers use reference points and self-review.
Some features require a Basic, Pro or Ultra subscription. Usage and export allowances depend on your plan and purchases. Subscriptions renew automatically unless cancelled. Local prices, billing periods, any trial eligibility and full benefits are shown before purchase. Manage or cancel subscriptions in your Apple account settings.
Apple Standard EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Errly Terms of Service: https://errly-60ac8.web.app/terms.html
Privacy Policy: https://errly-60ac8.web.app/privacy.html
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
What's New:
• All 9 subjects in one Error Book: Chinese, English, History, Geography, Politics, and Biology join Math, Physics, and Chemistry — plus create your own custom subjects
• Now in 8 languages: French, German, Spanish, Portuguese, and Korean join English, Chinese, and Japanese
• Export your Error Book as a Word document — as clean and print-ready as PDF
The developer, 奎锋 张, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
- Purchases
- Location
- Identifiers
- Usage Data
Data Linked to You
The following data may be collected and linked to your identity:
- Purchases
- Location
- Contact Info
- User Content
- Search History
- Identifiers
- Usage Data
- Diagnostics
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Identifiers
- Usage Data
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- 奎锋 张
- Size
- 173.1 MB
- Category
- Education
- Compatibility
Requires iOS 15.5 or later.
- iPhone
Requires iOS 15.5 or later. - iPad
Requires iPadOS 15.5 or later. - iPod touch
Requires iOS 15.5 or later. - Mac
Requires macOS 12.4 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
English and 7 more
- English, French, German, Japanese, Korean, Portuguese, Simplified Chinese, Spanish
- Age Rating
13+
- 13+
- This app is rated 13+ with content restrictions.
Some content may be rated higher, and may therefore be restricted and managed by the developer through in-app controls. - In-App Controls
Age Assurance
Contains
Advertising
- In-App Purchases
Yes
- Errly Pro Yearly (No Trial) $59.99
- Errly Pro Monthly (No Trial) $9.99
- Errly Pro Weekly $4.99
- Errly Extra Storage 50 GB $2.99
- Errly Midnight Blue Theme $2.99
- Errly Forest Theme $0.99
- Errly Advanced Export (Unlimited) $4.99
- Errly Advanced Export (1 Use) $0.99
- Errly Ultra Yearly $119.99
- Errly Ultra Monthly $14.99
- Copyright
- © 2026 Ganzhou Yunxiangji Technology Co., Ltd.