Privacy Policy

Last updated: January 7, 2026

Overview

One Line ("we", "our", or "the app") is a minimalist journaling application built with privacy at its core. This Privacy Policy explains how we handle your data when you use our app.

Data Collection

What We Collect

• Journal Entries: Stored locally on your device using AsyncStorage. We have no servers and cannot access your entries.
• App Preferences: Language settings, notification preferences, and theme choices - all stored locally.
• Purchase Information: When you purchase Pro features, RevenueCat (our payment processor) securely handles transaction data. See Third-Party Services below.

What We DON'T Collect

• ❌ Personal information (name, email, phone number)
• ❌ Location data
• ❌ Browsing history or usage analytics
• ❌ Advertising identifiers
• ❌ Device fingerprinting data

Data Storage

All your data is stored exclusively on your device using:

• AsyncStorage: For journal entries and app settings (free tier)
• Device Keychain/Keystore: For biometric authentication (Pro feature)

We have no cloud servers. Your journal entries never leave your device unless you manually export them via PDF (Pro feature).

Data Security

• Biometric Lock (Pro): Optional Face ID/Touch ID protection for your journal
• No Transmission: Since data never leaves your device, there's no risk of interception
• Device Security: Your data security depends on your device's security (passcode, encryption)

Third-Party Services

RevenueCat (In-App Purchases)

When you purchase Pro features or make tips, we use RevenueCat to process payments. RevenueCat collects:

• Purchase transaction data
• Anonymous device identifiers (for receipt validation)
• App Store/Play Store account information (handled by Apple/Google)

Read RevenueCat's privacy policy: revenuecat.com/privacy

Expo Framework

We use Expo for app development and over-the-air updates. Expo may collect:

• Crash reports (anonymous)
• App version and update information

Read Expo's privacy policy: expo.dev/privacy

Local Notifications

Daily reminders are handled entirely on-device. No data is sent to external servers.

Your Rights

• Access: All your data is already accessible to you within the app
• Export: Use PDF export (Pro) to save your journal entries
• Delete: Uninstalling the app deletes all local data permanently
• Opt-Out: Disable notifications anytime in app settings

Children's Privacy

This app is suitable for all ages. We do not knowingly collect personal information from anyone, including children under 13.

International Users

Since all data is stored locally on your device, no data crosses borders. GDPR, CCPA, and other privacy regulations are inherently satisfied by our local-first architecture.

Changes to This Policy

We may update this Privacy Policy occasionally. Changes will be posted here with an updated "Last updated" date. Continued use of the app constitutes acceptance of changes.

Data Retention

Your journal entries and settings remain on your device until you:

• Manually delete them within the app
• Uninstall the app
• Reset your device