CHEMBOOK PRIVACY POLICY
Version 2026-07-31

Publisher: Qemica Lab, an independent software developer based in the
Republic of Korea ("we").
Contact: feedback.qemica@gmail.com  ·  We are a one-person operation and
have not appointed a separate data protection officer. Email is our
contact channel; we publish no postal address.

This policy covers the Chembook mobile application. It does NOT cover the
Qemica desktop workbench, which is a separate product with its own policy
at /legal/privacy.


1. SUMMARY

   Chembook does not collect, transmit, or share any personal data.

   The app needs no account, no sign-in, and no network connection to
   function. There is no analytics, no advertising, no tracking, no
   crash reporting, and no third-party SDK that observes your use of
   the app.

   We have declared "Data Not Collected" on the App Store, and the
   privacy manifest shipped inside the app says the same thing.


2. WHAT THE APP STORES ON YOUR DEVICE

   Chembook saves a small amount of data locally, inside the app's own
   private storage on your device. It is never uploaded anywhere, and
   we have no way to read it. This includes:

   - Study progress, bookmarks, recent searches, and quiz results.
   - App preferences (interface scale, reduced motion, haptics).
   - A cached flag recording whether you own the Premium upgrade.

   You can erase all of it at any time from Settings > Reset all data,
   or by deleting the app. Deleting the app removes this data from your
   device; it does not cancel a purchase (see Section 4).


3. NETWORK USE

   The app itself makes no network requests. Every reaction, spectrum,
   orbital, structure and reference table ships inside the download and
   is read from local storage.

   The only network activity is the purchase and purchase-restore flow
   in Section 4, which is performed by the operating system's own store
   services, not by Chembook.


4. PURCHASES

   Chembook offers one optional, one-time in-app purchase ("Premium")
   that unlocks additional content already included in the download.

   Purchases are processed entirely by Apple (App Store) or Google
   (Google Play). Chembook never sees or stores your payment details,
   your store account identity, or your purchase history. Whether you
   currently own the purchase is checked on-device through the
   platform's own store APIs.

   Apple and Google handle that transaction under their own privacy
   policies, which we do not control:
   - Apple:  https://www.apple.com/legal/privacy/
   - Google: https://policies.google.com/privacy

   To restore a previous purchase on a new device or after
   reinstalling, use Restore Purchases on the Premium screen.


5. CHILDREN'S PRIVACY

   Chembook is an educational tool suitable for all ages and is rated
   4+. Because it collects no personal data at all, it does not
   knowingly collect information from children, and there is nothing
   for a parent or guardian to request the deletion of. Any data the
   app has written is on the device and is removed with the app.


6. YOUR RIGHTS

   Privacy laws such as the GDPR and the CCPA give you rights of
   access, correction, deletion, and portability over personal data a
   company holds about you.

   We hold none. There is no account, no server, and no database in
   which you appear, so there is nothing for us to disclose, correct,
   export, or erase. The data described in Section 2 is under your own
   control on your own device.

   We do not sell or share personal information, because we do not
   collect any.


7. CHANGES TO THIS POLICY

   If this policy changes, the updated version will be posted at this
   URL with a new version date. Material changes will also be noted in
   the app's release notes.

   Because the app collects nothing, we do not expect changes other
   than clarifications and updates to reflect new features.


8. CONTACT

   Questions about privacy: feedback.qemica@gmail.com