Privacy Policy

CloudEx Inc. ("we", "us", "our") operates the app "Pocket Science Lab" (the "Service"). This Privacy Policy explains what information we collect, how we use it, and the choices you have. By using the Service, you agree to the practices described in this policy.

1. Our Approach

Pocket Science Lab is an app for watching science experiments, such as pendulums, circuits, waves, lenses and planetary orbits, run on your phone while you change their conditions. Every calculation, the checking of graphs, formulas and challenges, and the saving of records happen entirely on your device. The experiments do not need an internet connection, and there is no account to create. The conditions you set and the results of your experiments are stored on your device, and we never view, collect or upload them, or send them to our servers. In particular, we have no access to any of the following:

  • The conditions you set in an experiment, its results, and the values in graphs and data tables
  • The records you save and the CSV files or images you export
  • Your challenge progress, favorites and app settings

The App does not ask for access to your location, camera, microphone, contacts, photos and videos, or files on your device. Experiment data leaves your device only when you yourself share or save a CSV file or image (Section 2).

2. Experiment Data and Records

  • Experiment conditions and display settings: For each experiment, the conditions you set last, the quantities shown in the graph, the layout of circuit parts and the playback speed are stored in the App's private storage on your device, so you can pick up where you left off.
  • Records (Premium): The conditions and results you save in "Records" are stored as files in the App's private storage on your device. You can rename or delete them in the App at any time.
  • CSV files and images: A CSV file of the data table or an image of the experiment screen is created only when you choose "Share" or "Save". When you share, that single file is handed only to the app you pick in Android's share sheet. When you save, it is written only to the location you pick in Android's file picker. Files created for sharing are kept in the App's temporary storage on your device.
  • When data leaves your device: Apart from the sharing and saving described above, and an email you choose to send us (Section 3.1), experiment data never leaves your device.

3. Information We Collect

3.1 Information Collected Automatically

  • Anonymous crash reports: We use Firebase Crashlytics. When the App crashes, it collects the stack trace, device model, OS version, app version, and a random installation ID issued by Firebase to group crashes. It contains no personally identifiable information and no experiment conditions or results.
  • Purchase information: The one-time "Premium" is purchased on Google Play. The App confirms the purchase by talking directly with Google Play on your device, using the purchase information Google Play issues. We do not send the purchase token to our servers, and we never receive payment details such as credit card numbers. Through Google Play's order management, we can see the information needed to handle an order (such as a refund), including the order number, the purchase date and time, and the country of purchase.
  • List of our other apps: To introduce our other apps, the App downloads their names, descriptions and icons from our content server (static files on Cloudflare Pages). These requests contain no personal data and no experiment data from the App. As with any web server, your device's IP address reaches the server as part of how the internet works. Tapping an app in the list opens its page on Google Play.
  • Viewing this Privacy Policy: When you open the Privacy Policy in the App, this page is loaded from our web server. As with any website, the server may keep access logs (such as IP address, browser type, and date and time).
  • Contacting us: When you send an email from "Contact" in the App, the app version, Android version and device model are filled into the message in advance to help us investigate. You can review or delete them before sending. We receive only the content of the email you actually send, including your email address.

3.2 Information Stored Only on Your Device

  • Experiment conditions and records: Stored on your device as described in Section 2, and never leave it unless you share or save them.
  • App settings and progress: Settings such as the color theme, showing the grid, keeping the screen on, the CSV separator and showing electron flow in circuits, as well as your challenge progress, favorites, the last experiment you opened and a cached copy of your Premium purchase status, are stored on your device. How many times the in-app review prompt has been shown and whether you have seen the onboarding are also recorded only on your device.
  • Android backup: If backup is turned on in your device settings, Android may include the App's settings and challenge progress in a backup to your own Google account. Saved records are excluded from cloud backup, but they may be moved when you transfer data directly to a new device. This is done by Android, and we cannot access the content.
  • When you uninstall: Uninstalling the App or clearing its data deletes the experiment conditions, records and settings on your device. CSV files and images you saved to a location you chose remain until you delete them.

3.3 Information We Do Not Collect

  • Experiment conditions, results and records, and the CSV files or images you export
  • Your name, email address, phone number or contacts (the App has no account registration; the only exception is an email you send us)
  • Your location
  • Camera, microphone, photos and videos, or files on your device
  • The advertising ID, your web browsing history or the content of your communications
  • What is on your screen or the content of other apps

3.4 Permissions the App Requests and Why

Pocket Science Lab uses only the permissions below. All of them are granted automatically at installation; the App never asks you for permissions that need your individual approval (such as location, camera, microphone, storage or notifications).

  • Internet (INTERNET) / view network state (ACCESS_NETWORK_STATE) — Used only to send anonymous crash reports, confirm purchases on Google Play, provide in-app review and in-app update, download the list of our other apps, and display this Privacy Policy in the App. The experiments do not need an internet connection.
  • Google Play billing (com.android.vending.BILLING) — Used to buy the one-time Premium on Google Play and to confirm and restore the purchase.

4. How We Use Information

We use the limited information we collect only to:

  • Operate and maintain the Service
  • Confirm Premium purchases and handle orders, such as refunds
  • Diagnose and fix crashes
  • Respond to your support requests
  • Comply with applicable laws

We do not sell the information we collect or use it for advertising or marketing.

5. Third-Party Services

Pocket Science Lab uses the following third-party services, each with its own privacy policy:

  • Firebase Crashlytics (Google LLC) — anonymous crash diagnostics
  • Google Play Billing (Google LLC) — purchase of the one-time Premium. Payment is completed entirely on Google Play
  • Google Play In-App Review / In-App Updates (Google LLC) — lets you rate or update the App without leaving it. Google Play handles the processing
  • Cloudflare Pages (Cloudflare, Inc.) — delivery of the list of our other apps (static files)

Pocket Science Lab does not include any usage analytics tools or advertising SDKs. It shows no ads in the App and does not share your data with advertising networks.

6. Data Retention

  • Crash reports: kept for 90 days, then deleted.
  • Support emails: kept for 12 months after our last exchange, then deleted (unless the law requires otherwise).
  • Experiment conditions, records and settings on your device: kept until you delete them, uninstall the App or clear its data.

7. International Data Transfers

We are based in Japan. The infrastructure used for crash diagnostics and for delivering the list of our other apps may be located in various countries. By using the Service, the minimal information described above may be processed outside your country of residence under standard contractual safeguards.

8. Your Rights

Depending on where you live (for example the EEA, the UK, California or Japan), you may have the right to request access to, correction of, or deletion of the limited information we hold. You can:

  • Delete saved records in the App at any time, and reset experiment conditions to their defaults
  • Delete all experiment conditions, records and settings on your device by uninstalling the App or clearing its data
  • Contact us at the address below with a request about information we hold (such as crash reports or your support emails)

9. Children's Privacy

Pocket Science Lab is not directed to children under 13 (or under the minimum age that applies where you live). The App has no account registration and never asks you for personal information such as your name or contact details. If we learn that we have accidentally received personal information from such a child, we will delete it promptly after being contacted.

10. Changes to This Policy

We may update this Privacy Policy from time to time. The latest version, with its effective date, is always published at this URL. We will also let you know about important changes in the App where appropriate.

11. Contact Us

For questions about privacy, requests about your data, or to report a concern, please email .

CloudEx Inc. (Japan)

Effective Date: October 27, 2026