Privacy Policy

Knosys is a local-first personal knowledge management application. Your data stays on your device by default, and any optional cloud sync is end-to-end encrypted. This Privacy Policy explains what limited information we collect, how we use it, and your rights regarding that information.

When you create an account or subscribe to Knosys Cloud Sync, we collect the following information:

• Account email address — used to identify your account and send service communications
• Subscription and billing information — processed and stored by Paddle, our merchant of record
• Device identifiers — used to facilitate sync across your devices
• Basic analytics — anonymous usage data to help us improve the application

Knosys is designed so that we never have access to your personal content. We do not collect or have the ability to read:

• Your notes, documents, or any written content
• Calendar events or reminders
• Files, images, or attachments
• Location data saved within the app

All of this data is stored locally on your device. If you use Cloud Sync, this data is encrypted end-to-end before it leaves your device. Our servers store only encrypted ciphertext that we cannot decrypt.

The limited information we collect is used to:

• Operate and maintain the Knosys Cloud Sync service
• Process payments and manage subscriptions
• Provide customer support
• Send service-related communications (e.g., billing confirmations, important updates)

We use the following third-party services to operate Knosys:

• Paddle — payment processing, billing, and sales tax as our merchant of record
• Turso — stores encrypted sync data (ciphertext only)
• Vercel — hosts our marketing website and license server

Each third-party service operates under its own privacy policy. We encourage you to review their policies for details on how they handle data.

Your local data stays entirely on your device and is never transmitted to our servers unless you opt in to Cloud Sync. When Cloud Sync is enabled, all data is encrypted end-to-end on your device before being transmitted. Our servers store only encrypted ciphertext — we cannot access, read, or decrypt your content.

We use industry-standard security measures to protect the infrastructure that supports our services.

Local data is entirely under your control and is never deleted by us. For Cloud Sync data stored on our servers, synced data will be deleted within 30 days of account termination. Account information (email and subscription records) may be retained as required for legal and billing purposes.

You have the right to:

• Access the personal information we hold about you
• Request deletion of your account and associated data
• Export your data at any time from the Knosys desktop app
• Cancel your subscription at any time

To exercise any of these rights, contact us at support@knosys.app.

Knosys is not directed at children under the age of 13. We do not knowingly collect personal information from children under 13. If you believe a child has provided us with personal information, please contact us so we can take appropriate action.

We may update this Privacy Policy from time to time. When we make changes, we will update the “Last updated” date at the top of this page. Continued use of the service after changes are posted constitutes your acceptance of the revised policy.

If you have any questions about this Privacy Policy, please contact us at support@knosys.app.