โ Core Principle: No Server Transmission
KSTA Calculator does not collect or transmit personal information to any server.
All data (portfolio, settings, memos, etc.) is stored only on your device (localStorage).
๐ 1. Stored Information (Device Only)
The following is stored only in your device's localStorage and is not transmitted externally.
Type
Content
Storage Location
โ๏ธ Settings
Dark mode, language, voice options, etc.
Device only
๐ผ Portfolio
Coins held, quantities, average prices
Device only
๐ Alerts
Target price alerts, daily briefings
Device only
๐ Investment Memos
Voice memos, investment journal (v108)
Device only
๐ Price History
24-hour price records (for chart analysis)
Device only
๐ฌ AI Conversation
Recent AI conversations (none or short-term cache)
Device only
๐ 2. Data Transmitted Externally
The data this service transmits externally is limited to:
2-1. Price Lookup (Price Provider APIs)
Targets: Upbit (api.upbit.com), Binance (api.binance.com) public APIs
Content: Coin symbol lookup requests (includes your IP)
Condition: Only occurs when AI features are enabled and used
โน๏ธ AI Usage Notice
AI providers (Anthropic, OpenAI, Google) have their own privacy policies.
Voice-input questions are transmitted to those services' servers, so do not include sensitive personal information.
2-3. PWA Updates
App file updates via Service Worker (HTTPS)
No personally identifiable information
๐๏ธ 3. Voice Data
Voice recognition and synthesis use the browser's Web Speech API:
iOS Safari: Uses Apple's voice services
Android Chrome: Uses Google voice services
Desktop: Uses each browser provider's services
Voice data is not transmitted to KSTA servers and follows the browser / OS provider's policies.
๐ก Tip
Do not speak sensitive personal information (SSN, passwords, etc.) during voice recognition.
๐ช 4. Cookies and Tracking
โ No Cookies Used
This service does not use cookies. No tracking pixels, advertising IDs,
Google Analytics, or any other tracking tools are used.
The only storage technologies used are:
localStorage: For settings / portfolio / etc. (device only)
Service Worker Cache: For offline app file cache
๐ 5. Security
5-1. Transmission Security
All communications are encrypted with HTTPS (TLS 1.3).
External API calls also use HTTPS only.
5-2. Storage Security
localStorage is only accessible from the service's domain.
We recommend using device security (PIN, biometrics) when storing sensitive information.
5-3. Data Deletion
You can delete all data using:
Within the app: "Reset Data" in settings (future addition)
Browser: Settings โ Privacy โ Clear Site Data
iOS: Settings โ Safari โ Clear History and Website Data
Android: Chrome Settings โ Privacy โ Clear Browsing Data
๐ค 6. User Rights
Users have the following rights:
๐ Right to access: View all data stored on your device from within the app
โ๏ธ Right to correct: Directly modify all settings / portfolio items
๐๏ธ Right to delete: Delete individual items or all data
๐ซ Right to object: Turn off AI / voice features
๐ค Right to portability: (Future) Data export feature
Since this service does not store personal information on servers, users can exercise all rights directly.
๐ถ 7. Child Protection
This service is intended for users aged 14 and above.
Children under 14 may only use it with parental / guardian consent.