PRIVACY POLICY
Your data
stays on your device
Here is exactly what this site and the Zhiming Yixue app do with your information — what we collect, why, how long we keep it, and how you get it back or delete it.
01What we collect
We obtain information in exactly two ways: you give it to us, or a server records it because it has to.
1.1 Information you provide
| Where | Fields | Required |
|---|---|---|
| Guestbook | Display name, topic, message | Yes |
| Guestbook | Email address | Optional, reply only |
| Your address and message | Given when you write | |
| Beta request | Email, OS version | Yes |
| App account | Phone or email, password | Yes, for membership |
No real-name verification is required. Pick any display name you like. We use your email only to reply — never for marketing.
1.2 Automatically logged
Like every web server, ours records access logs. The fields are standard:
- IP address (rate limiting, abuse prevention, troubleshooting)
- Timestamp, requested path, referrer
- Browser and OS user agent, viewport size
- HTTP status code and bytes transferred
These logs exist to find broken pages and block malicious traffic. We do not use them to build a profile of you, and we do not link them to your guestbook identity.
1.3 What we never collect
- Government ID numbers, bank card numbers, precise location
- Contacts, SMS or photo library access (photos you select for face reading are processed in memory only — see section 2)
- Advertising identifiers or cross-site tracking pixels
- Device fingerprints or canvas fingerprints
02Face reading and photos
This is the part people ask about most, so it gets its own section.
The face reading module uses an on-device model (MediaPipe FaceLandmarker) to locate 478 facial landmarks. The entire pipeline runs on your phone:
- Photos are decoded in app memory only; nothing is written to disk
- No network request is made during recognition — it works in airplane mode
- Results (landmark coordinates, palace readings) are stored in the local database and never uploaded
- Closing the page or quitting the app releases the image from memory
The same applies to every charting module — BaZi, Zi Wei, Liu Yao, Qi Men. The algorithms and the entire imagery database ship inside the app. Birth data and saved charts stay on your device.
03Cookies and local storage
This site sets no third-party cookies and does no cross-site tracking. Two items live in your own browser:
| Name | Purpose | Lifetime |
|---|---|---|
| zm-theme | Remembers your dark / light preference | Until you clear browser data |
| Guestbook cache | Stores your posts and likes while no server is attached | Same |
Both are local only. Clearing site data removes them and does not affect browsing.
04How we use it
- Publish and answer guestbook posts — display your message, reply by email if needed
- Keep the service safe — rate limiting, spam and abuse detection
- Fix problems — using access logs to trace errors and failed downloads
- Membership — verifying subscription status, handling renewals and refunds
We do not use your information for marketing messages, selling to third parties, behavioural profiling, or training AI models.
05Sharing and processing
We do not sell or rent personal data. Sharing is limited to the processors we need to run the service:
| Processor | Data involved | Purpose |
|---|---|---|
| Cloud host (Tencent Cloud) | Access logs, guestbook data | Servers, database, bandwidth |
| Payment provider | Order ID, amount | Collecting membership fees |
| SMS provider | Phone number | Login verification codes |
Processors act only on our instructions. Servers and databases are located in mainland China; there is no cross-border transfer of personal data.
The only exception is a lawful request from a competent authority under applicable law.
06How long we keep it
- Guestbook posts — until you ask us to delete them, or the service closes
- Emails attached to posts — deleted 12 months after the reply is sent, unless you ask us to keep them
- Access logs — rolling 30 days, then automatically purged
- Orders and membership records — 3 years, as required by tax and commercial law
- App data on your device — stays until you uninstall
07Your rights
Under China's Personal Information Protection Law you have the following rights, with no conditions attached:
- To know — this page is the answer; ask if anything is unclear
- To access and copy — request the posts and email records we hold about you
- To correct — fix a typo in your post or a wrong email address
- To delete — remove your posts and email, including from backups
- To withdraw consent — ask us to stop using your information at any time
- To close your account — the app has a delete-account entry; local and server records are both erased
To exercise any of these, email service@ichingxy.cn with the display name or address you used. We respond within 15 working days.
08Minors
This site and app are intended for adults. If you are under 14, please use them only with a parent or guardian present and consenting. We do not knowingly collect data from children; contact us if you believe we have, and we will delete it.
Face reading, wellness and cycle modules are cultural reference material, not medical diagnosis. Please see a doctor when you are unwell.
09Security
- HTTPS enforced site-wide (TLS 1.2 / 1.3)
- SHA-256 checksums published for every installer, so you can verify the file yourself
- Only necessary ports open; default accounts and debug endpoints disabled
- Guestbook API rate-limited and input-validated against injection and flooding
- Encrypted, regular database backups
To be honest with you: no system is absolutely secure. If a breach occurs, we will notify affected users and report to regulators as required by law.
10Changes and contact
If this policy changes materially, we update the date at the top of this page and announce it on the homepage for 30 days. Continued use means acceptance.
- Email: service@ichingxy.cn
- Guestbook: leave a message (anonymous allowed)
- Operator: Guicang Studio
You may also lodge a complaint with China's cyberspace or market regulation authorities.