No app account required
Paper balances, orders, positions, watchlists, and reminder preferences stay on this device. Optional Pro purchases use your Apple Account.
STOCK MASTERY / SUPPORT & LEGAL
Stock Mastery
Support & legal
Get help with the app and learn how your information and third-party content are handled. Stock Mastery offers Taiwan end-of-day data, financial references and paper trading. From 2.3.0, optional Pro unlocks Taiwan index, electronics and financial futures, micro U.S. index, gold and oil futures, and Taiwan and U.S. equity/ETF options practice. U.S. and derivatives practice uses custom prices. No intraday quotes or real trading are provided.
No advertising tracking
There are no advertising, third-party analytics, or cross-app tracking SDKs.
Practice only
Taiwan and U.S. paper trades use virtual funds and are never sent to a broker or exchange.
SUPPORT
Contact us
Email us about technical issues, app questions, content corrections, or feature suggestions. Support is available in Traditional Chinese and English.
Developer and support: Yung Wen Cheng
Product: Stock Mastery / 股神養成
Details that help us investigate
- App version, device model, and iOS, iPadOS, or macOS version.
- Steps to reproduce the issue, what you expected, and what happened.
- For market data, the market, symbol, and data timestamp shown in the app.
- Optional screenshots with names, accounts, balances, and other personal information concealed.
Do not send passwords, verification codes, identity documents, or brokerage credentials. We will not ask you to transfer money or give us control of an investment account.
Choose an email topic
These links open your email app. You can also copy the address above. This page has no upload form and does not automatically attach app records.
Common questions
Why does a quote differ from the current trading price?
Taiwan uses official open end-of-day data. Holidays, pending publication or connection failures may leave older or cached data on screen; check the date. From 2.2.0 (12), U.S. practice uses prices you enter. U.S. quotes and historical charts for either market are not provided. Pro derivatives also use fill and mark prices you enter; prices do not change automatically when markets open or trade.
Can a paper order spend real money?
A paper order cannot. Balances, orders, positions, and results are virtual records on your device. They are never sent to a broker and cannot be withdrawn or redeemed. A simulated result does not guarantee execution in a real market. If you separately confirm a Pro subscription purchase, Apple charges a real subscription fee at the price shown in the purchase sheet.
Does a custom price change quotes or position values?
For stocks, a custom price applies only to that simulated fill and is labeled as user-entered and unverified. Taiwan positions still use end-of-day quotes. U.S. stock positions show cost, not current market value or unrealized P&L; realized P&L is calculated from fill prices when you sell. For Pro derivatives, you can update a position's mark price manually, which changes simulated unrealized P&L and account equity. It is not a market quote. These paper-trading actions do not charge real funds.
What does Pro include, and how do I manage it?
From 2.3.0, Pro lets you open or add to simulated positions in TAIEX TX, Mini-TAIEX MTX, Micro-TAIEX TMF, electronics TE and financial TF futures, plus Micro E-mini S&P 500 MES, Micro E-mini Nasdaq-100 MNQ, Micro Gold MGC and Micro WTI Crude Oil MCL futures. It also includes TAIEX TXO options and standard U.S. equity/ETF options. You enter expiration dates, strikes, fill and mark prices, fees and practice margin. Listed contract chains, live quotes, automatic exercise, assignment, settlement, forced liquidation and stock or commodity delivery are not provided.
Pro offers monthly and yearly auto-renewable plans. See the app and Apple's purchase confirmation for the actual price and period. In Profile > Stock Mastery Pro, you can restore purchases or manage your subscription. It renews automatically unless cancelled before the current period ends. You can also cancel in your Apple Account subscription settings. Deleting the app or resetting practice data does not cancel a subscription.
After Pro access expires, you cannot open or add to Pro positions. You can still view, update marks, close, export or reset existing practice records. The Apple Standard EULA applies.
How can I adjust practice time?
The TWD and USD derivatives accounts share one practice clock. Follow real time, or set a custom scenario date and use Advance a Day. After a trade, time cannot move backwards. To practice an earlier date, export your records and reset the derivatives accounts first.
Advancing the date only changes expiration checks. It does not replay historical prices, generate or predict prices, or automatically change funds or option time value. Contract expiration is checked against the practice clock. Once a contract expires, new positions are blocked and existing positions still require manual closing.
How can I adjust missing reminders?
Check Review Reminders in Profile and notification permission in system Settings. Reminders are scheduled Monday through Friday at 6:00 p.m. in your device's local time, including exchange holidays. They are not market-update or fill alerts. Focus modes and system settings can affect delivery; other features remain available without notifications.
How do I remove my records?
In Profile, reset a paper account or use Clear Personal Settings. The derivatives screen also offers export and reset. Clearing removes local watchlists, recent views, learning records, and paper-trading records; read the confirmation shown in the app. There is no app login account or app account-deletion process. Resetting or deleting the app does not cancel an Apple subscription. Email support to request deletion of correspondence.
Stock Mastery / 股神養成
© 2026 Yung Wen Cheng (Stock Mastery). All rights reserved.
Yung Wen Cheng reserves the applicable rights in the original code, text, and design of Stock Mastery and this website to the extent protected by copyright. Stock Mastery is a product name, not the owner of third-party market data.
Unless permitted by law, fair use, or a separate license, obtain the relevant rights holder's permission before reproducing, adapting, or distributing protected content. This notice does not limit rights granted to users by law.
Market data, trademarks, and third-party content
From 2.2.0 (12), Taiwan uses ten open datasets from TWSE and TPEx under the Open Government Data License v1.0. Profile > Market Data Sources lists the datasets, providers and license links. U.S. prices are entered by the user; no U.S. market service is contacted. Rights in third-party trademarks, names, indices, and data remain with their respective holders and are not included in our original-content copyright notice.
Attribution does not itself establish commercial or redistribution rights, or imply any partnership, sponsorship, certification, or endorsement by these organizations or Apple. Use of third-party content remains subject to applicable terms and licenses. This page grants no permission to reuse that content.
Copyright concerns and corrections
If you believe content in the app or on this website affects your rights, email us with its location, the work or right involved, your relationship to the rights holder, and a reply address. Public links can help identify the material; do not send identity documents or sensitive records.
We will assess the report and, as appropriate, follow up, correct, or remove the material. Contact victoriacheng1122@gmail.com.
Information we collect
This policy covers the Stock Mastery app, widgets, and this support website. The responsible developer is Yung Wen Cheng. Privacy contact: victoriacheng1122@gmail.com.
The app does not require an account with us or ask you to provide us with your name, phone number, address, or payment details. If you choose Pro, Apple processes the purchase and payment through your Apple Account. The app does not request access to your camera, photos, microphone, location, contacts, HealthKit data, or tracking permission.
Market data and network connections
From 2.2.0 (12), the app's market-data features connect only to TWSE and TPEx OpenAPI services for bulk Taiwan end-of-day data, company information, valuation metrics and corporate-action dates. The widget uses a subset of the TWSE datasets. Supplemental website reports, historical query services, Yahoo Finance and other U.S. market feeds are no longer used. Apple connections for Pro subscriptions are described below; derivatives do not connect to a market-data service.
This version requests bulk public datasets, not individual symbols or historical periods. U.S. catalog searches and custom prices are processed on the device. Watchlists, browsing records, virtual balances, positions, orders, fill prices and notes are not uploaded. Earlier test builds contacted U.S. and historical services; update to this build. Their past requests remain subject to the providers' policies at that time.
The app's market-data connections do not use provider cookies or shared system credential storage. This does not mean providers do not process connection information.
As with ordinary internet connections, these providers may receive an IP address, User-Agent, and standard connection metadata. Their handling of that information is governed by their respective policies.
Information stored on your device
Virtual TWD and USD balances, paper orders, positions, results, order history, and custom fill prices are stored on your device. Watchlists, recent views, market cache, language and notification preferences, bookmarks, reading progress, and getting-started progress are also stored locally to preserve your state. Pro derivatives' custom contracts, expiration dates, strikes, mark prices, fees, practice margin, shared practice-clock settings and trading records are also stored on the device. This information is not uploaded to our servers and is never sent to a broker or exchange.
Pro subscriptions and Apple
From 2.3.0, Pro is an optional auto-renewable subscription through Apple's App Store. Apple handles purchases, renewals, restoring purchases and subscription management. The app uses StoreKit on the device to verify Apple-provided transactions and subscription status, including product and transaction identifiers, validity periods, expiration, revocation or refund status, to determine Pro access. It does not send this transaction data to our servers.
We do not receive your Apple Account password, card number or other payment credentials. Apple handles account, payment, purchase and necessary connection information under its policies and may provide App Store sales and subscription reports to developers. See Apple's App Store & Privacy.
Notifications
Review reminders are optional. The app requests iOS notification permission only after you view an explanation and choose to enable reminders. They are scheduled on your device Monday through Friday at 6:00 p.m. local time, including exchange holidays, rather than triggered by market updates or order fills. You can disable them in the app or system settings. Declining permission does not affect any other feature.
Email support and this website
When you choose to email us, we receive your email address, sender name, message, and any attachments you provide. We use them only to respond, investigate issues, handle privacy or copyright requests, and follow up as needed, not for advertising. Include only information necessary for your request.
Support email is handled through Gmail and may be stored internationally under its service arrangements. We retain correspondence while needed to handle the request and necessary follow-up, then delete information no longer needed unless retention is required for legal obligations or disputes. Email us to request access, correction, or deletion of contact information we hold. We will explain any required retention. Backup deletion timing is governed by the email provider's policies.
This website is hosted on GitHub Pages. We have not added analytics, tracking pixels, advertising, or our own cookies. GitHub may process IP addresses, browser information, and access logs for hosting, security, and operations. External websites handle information under their own policies when you follow their links.
Your data controls
Local records remain until you reset a paper account, clear personal settings in Profile, or delete the app. The system may remove cached market data sooner. Offloading an app can preserve its data and is different from deleting it. Device or computer backups may retain earlier copies; manage these through Apple's backup settings.
We have no account server that can remotely access or delete local records. You can change notification permission in system Settings at any time. For access, correction, or deletion of email correspondence, contact the support address above.
Clearing local records or deleting the app does not cancel Pro or delete purchase records held by Apple. Manage subscriptions through Manage Subscription in the app or your Apple Account settings.
Service and investment notice
Stock Mastery provides end-of-day market information, paper-trading practice, and general educational material. It is not a broker. A paper order creates only a virtual record on your device, uses no real funds, and is never submitted as a real order. Simulated fills, commissions, taxes, and results are educational estimates and do not include every market condition, exchange rate, regulatory fee, brokerage fee, discount, minimum fee, tax effect, or product exception.
The app does not provide real trading, brokerage account opening, managed investing, personalized investment advice, or guaranteed returns. Taiwan data is end of day. U.S. and derivatives practice uses custom prices, not market quotes; valuation does not update automatically when markets open. Pro derivatives do not verify that a contract is exchange-listed or perform automatic exercise, assignment, expiration settlement, forced liquidation or stock or commodity delivery. Expiration is checked against the shared practice clock. After expiration, new positions are blocked and existing positions still require manual closing. Advancing the date does not replay historical prices, generate prices or apply option time decay. Legacy pending U.S. orders are preserved for cancellation but no longer fill automatically. Data may be delayed, incomplete, or temporarily replaced by cached information. Confirm any real decision with official exchange and brokerage information.
Policy changes and contact
If a future version introduces accounts, cloud sync, or new data practices, this page will be updated. Questions about this policy can be sent to victoriacheng1122@gmail.com.