Privacy Policy

Last Updated: October 7, 2025

Plain Calendar's Use and Transfer of Information: Plain Calendar's use and transfer of information received from Google APIs adheres to the Google API Services User Data Policy, including the Limited Use requirements.

1. Introduction

This Privacy Policy describes how Plain Calendar ("we", "our", or "the Application") collects, uses, and protects your information when you use our Windows desktop application.

2. Information We Collect

2.1 Calendar Data from Google

When you connect your Google Calendar account, the Application accesses:

Calendar event titles, descriptions, and locations
Event start and end times
Event attendees and organizers
Calendar names and settings
Event reminders and notifications

2.2 Information We Do NOT Collect

We do not collect any personal information beyond what's necessary for calendar synchronization
We do not collect analytics or usage statistics
We do not collect device information or system data
We do not use cookies or tracking technologies
We do not collect information about other applications on your device

3. How We Use Your Information

Your calendar data is used exclusively for:

Display: Showing your calendar events in the application interface
Synchronization: Keeping your local calendar in sync with Google Calendar
Management: Allowing you to create, edit, and delete events
Offline Access: Storing data locally so you can view events without internet

We do NOT:

Share your data with any third parties
Use your data for advertising or marketing
Analyze your calendar data for any purpose
Train AI models or machine learning algorithms with your data
Sell or monetize your information in any way

4. Data Storage

4.1 Local Storage

All calendar data is stored locally on your Windows device in an encrypted database using Windows Data Protection API (DPAPI). The data location is:

Windows: %LOCALAPPDATA%\PlainCalendar\
Data is encrypted and accessible only by your Windows user account
No cloud backup or external storage is used

4.2 No Remote Storage

We do not operate any servers or cloud storage. Your calendar data never leaves your device except when:

Synchronizing directly with Google Calendar API
You explicitly choose to back up your device

5. Data Sharing and Third Parties

The Application only communicates with Google Calendar API for synchronization purposes. We do not share your data with any other third parties.

5.1 Google Calendar Integration

When you authorize Google Calendar access:

Data is transmitted directly between your device and Google servers
We do not act as an intermediary or store credentials
Your Google authentication tokens are stored locally and encrypted
You can revoke access anytime through Google Account settings

6. Data Security

We implement security measures to protect your data:

Encryption: Local data is encrypted using Windows DPAPI
Authentication: OAuth 2.0 for secure Google Calendar access
No Password Storage: We never see or store your Google password
Isolated Storage: Data accessible only by your Windows user account

7. Your Rights and Choices

7.1 Access and Control

You have complete control over your data:

View: All your calendar data is visible in the application
Export: Data is stored in standard SQLite format
Delete: Uninstalling removes all local data
Disconnect: You can disconnect Google Calendar access anytime

7.2 Revoking Access

To revoke Google Calendar access:

Visit Google Account Permissions
Find "Plain Calendar" in the list
Click "Remove Access"

8. Data Retention

Calendar data is retained locally until you delete it or uninstall the application
Uninstalling the application permanently deletes all local data
Disconnecting Google Calendar does not delete local data (manual deletion required)

9. Children's Privacy

Plain Calendar is not intended for users under 13 years of age. We do not knowingly collect information from children.

10. International Data Transfers

Your data is stored locally on your device. When synchronizing with Google Calendar, data transfer is handled by Google according to their privacy policy.

11. Changes to This Privacy Policy

We may update this Privacy Policy from time to time. Changes will be posted on this page with an updated "Last Updated" date. Continued use after changes constitutes acceptance of the updated policy.

12. Compliance

This application complies with:

Google API Services User Data Policy
Google OAuth 2.0 Policies
Limited Use requirements for Google user data

13. Contact Us

If you have questions about this Privacy Policy or your data, contact us at:

Email: nightskyworks@gmail.com

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