Terms of Service

Personal account and eligibility

These Terms govern your use of WhyArc, operated by Cao Jian. The service is for ages 13 and older in supported countries and regions. Provide accurate age and country or region information and do not bypass eligibility restrictions. Regional service and App Store subscription availability may differ; the app checks current account eligibility and Apple displays the local billing terms. Each account is for one learner. If applicable law requires a parent or guardian's permission for you to enter these Terms, authorize data processing or make a purchase, obtain it before continuing. For Malaysia learners under 18, the parent or legal guardian must control the sign-in account and give the additional, recorded guardian permission after reviewing the English and Bahasa Melayu privacy notice. Verified sign-in confirms account control, not your age, adulthood or a parental relationship.

Sign in before setting up your learning profile or opening lessons. With profile saving enabled, use the same sign-in method and WhyArc account on another device to restore its saved cloud profile, progress and learning plan after successful server authorization. If no learning plan has been saved to your account, choose one once. Keep credentials secure and report suspected unauthorized access. Email/password accounts require email verification. Apple and Google sign-in availability depends on the installed version.

Learning and acceptable use

WhyArc is supplemental science practice, not a school, accredited course or guarantee of grades, examination results or mastery. The current English lessons primarily cover science foundations around ages 13–14, and the catalog may grow over time. Follow appropriate adult, school and manufacturer safety instructions for real-world activities; do not improvise dangerous experiments.

Do not use the service unlawfully, harm or identify others, access another account, bypass security or entitlement checks, overload the service, distribute malicious code or unlawfully copy or sell its content. We may restrict access for material abuse or security risks, subject to applicable law and notice.

WhyArc Plus

Free includes 12 lessons—the first two in each of six chapters—and up to two newly completed lessons per local day. Completed lessons and reviews remain available subject to the current account agreement. Plus includes all 120 current lessons, new Plus lessons released while the subscription is active, and up to six newly completed lessons per local day. Agreement to AI processing is required for registered learning but does not grant Plus or bypass its limits. Nova's online AI answer feedback still requires Plus, current permission and an available online service; permission does not need to be switched on for each request. Check the service status in the app; agreement and purchase do not activate a disabled service.

Plus is an automatically renewing monthly or annual App Store subscription when available in your installed version. Apple shows the exact localized price, billing period, any eligible introductory offer and renewal terms before confirmation. Payment uses the App Store account on your device; Plus belongs to the WhyArc account signed in during the verified purchase. Use the same WhyArc account to restore. A purchase cannot be bound to multiple WhyArc accounts.

Unless cancelled, subscriptions renew automatically under the terms displayed by Apple. Cancelling renewal preserves the paid period, subject to refunds or revocation. Restore purchases does not create a new charge. Apple handles subscription management and refund requests under its rules and applicable law. A pending, cancelled or unverified purchase does not grant Plus.

Expiry or refund does not erase completed lessons, reviews or rewards. New paid content and online AI may become unavailable. Deleting WhyArc or its account does not cancel renewal. Use Apple subscription settings separately.

Privacy and AI coaching

The Privacy Policy explains account data, minimal United States progress sync and written-answer AI processing through BytePlus ModelArk, whose published processing locations include Malaysia, Indonesia and the EU/EEA. AI answer coaching is a core part of registered learning and requires explicit agreement to the current AI account notice before account setup or continued learning. Purchasing Plus, merely signing in or an older AI grant does not authorize text transmission under this changed notice. Account/profile processing and written-answer processing remain separately recorded. After agreement, intentionally submit an answer for available Nova feedback; we do not send it merely because you typed it or agreed. You may withdraw permission under AI coaching & privacy; registered learning then pauses while privacy, data export, account deletion and sign-out remain available.

AI feedback can be incomplete or incorrect. It supports reflection rather than professional advice, authoritative grading or emergency help. When you authorize written-answer coaching and submit an answer, that text and approved lesson context are sent through our backend to the AI provider. Do not include personal or sensitive information. We do not save your writing or generated feedback as answer history; provider safety-retention limitations are explained in Privacy.

Content, services and termination

WhyArc content and software belong to Cao Jian or their licensors. You receive a limited personal, non-exclusive and non-transferable right to use the service for learning, subject to these Terms and any required subscription. You retain rights in your original writing. Mandatory rights and lawful exceptions remain unaffected.

Firebase, Apple, Google and BytePlus have their own applicable service terms. Availability may be affected by their services. We may change or discontinue features subject to notice, paid-access commitments and applicable law. You can stop using the service and request account deletion in Settings after a recent sign-in; deletion may complete asynchronously.

The service is provided as available. We do not exclude liability or consumer rights that cannot lawfully be excluded. Contact jamesloopme@gmail.com about disputes, account access, subscription help or these Terms. We will notify users of material changes and obtain renewed agreement when required.

Contact and provider information

Operated by Cao Jian. jamesloopme@gmail.com.

Firebase privacy · BytePlus processing notice · Apple billing support

Governing law: Singapore. This does not remove mandatory protections under applicable law.