The Best To-Do List Apps That Protect Your Privacy in 2026

A to-do list app holds your daily tasks, appointments, and sometimes even passwords or project details—so how it handles that data matters. With several high-profile data breaches in the past two years and renewed scrutiny on how apps share information with advertisers, many users are looking beyond features when choosing a task manager.

What happened

In 2025 and early 2026, researchers and journalists uncovered that several popular productivity apps were sharing user task data with third-party analytics firms—in some cases even when users had opted out. One widely used to-do app was found to transmit plain-text task titles to a marketing partner. Around the same time, a major cloud-based to-do service disclosed a breach that exposed user account details.

These incidents didn’t affect every app, but they highlighted a gap: most reviews focus on usability, design, and integration, not on security and privacy practices.

Why it matters

Your to-do list isn’t just a list of errands. It can include work deadlines, travel itineraries, health reminders, and personal notes. If that data is stored without proper encryption or is accessible to third parties, it could be misused. For professionals who handle confidential information, a weak privacy posture can be a real risk.

Beyond the obvious security concerns, some apps also collect metadata—like how often you complete tasks or what time of day you schedule things—that could be used to build profiles or sell to advertisers. Even if you aren’t a privacy extremist, it’s worth knowing which apps treat your data as yours.

What readers can do

If you’re shopping for a to-do list app in 2026, here are the privacy features to check:

• End-to-end encryption (E2EE): Ensures only you and the people you share tasks with can read the content. The app provider cannot see your tasks.
• Zero-knowledge architecture: The company has no way to decrypt or access your data because the encryption keys are stored on your device.
• Minimal data collection: Look for apps that don’t collect usage analytics unless you opt in, and that clearly state what data is gathered in their privacy policy.
• Independent audits: Some apps publish third-party security audits or a transparency report.
• Company location and jurisdiction: Data stored in countries with strong privacy laws (like the EU or under CCPA in California) may offer better legal protections.

The following three apps are often recommended in roundups like Wirecutter’s 2026 review, and their privacy approaches differ substantially.

The apps and their privacy features

1. Todoist

Todoist offers a strong baseline: data is encrypted in transit (TLS) and at rest (AES-256). However, it is not end-to-end encrypted by default. That means Todoist’s servers can technically access your task content. The company states it does not sell personal data, but it does collect usage analytics unless you opt out. For most users, this is acceptable, but if you handle highly sensitive information, Todoist may not be the best choice.

• Encryption: In transit and at rest; no E2EE.
• Data sharing: With third-party analytics (optional).
• Audits: No publicly available independent security audit as of early 2026.
• Best for: Users who want a polished, cross-platform app and are comfortable with basic encryption.

2. Things 3 (Apple only)

Things 3 is a local-first app. Your tasks are stored on your device and synced through Apple’s iCloud using Apple’s end-to-end encryption (if you have iCloud Advanced Data Protection enabled). Things itself never sees your data—it only stores encrypted files in iCloud. That means even if Things’ servers were compromised, your tasks would remain private.

• Encryption: Depends on iCloud; with Advanced Data Protection, it’s truly end-to-end.
• Data sharing: None. Things does not collect analytics or share data.
• Audits: iCloud encryption has been reviewed publicly; Things does not have its own separate audit.
• Best for: Privacy-conscious Apple users who don’t need Windows or Android support.

3. Microsoft To Do

Microsoft To Do offers encryption in transit and at rest, but not end-to-end. Task content is accessible to Microsoft’s servers (and could be subject to legal requests). The app integrates deeply with Microsoft 365, meaning data is also processed within Microsoft’s ecosystem. Microsoft has strong enterprise privacy policies, but they still can access your data for legitimate operations.

• Encryption: In transit and at rest; no E2EE.
• Data sharing: With Microsoft for service improvement; no third-party sharing.
• Audits: Microsoft is SOC 2 certified and publishes a privacy dashboard.
• Best for: Those already in the Microsoft ecosystem who want reliable syncing across Windows, Mac, and mobile.

Comparison at a glance

Which app should you choose?

If privacy is your top priority and you live in the Apple ecosystem, Things 3 is the clear winner. The combination of local-first storage and optional end-to-end encryption through iCloud means your tasks are as private as anything on your phone.

If you need cross-platform support and prefer a more proven, feature-rich app, Todoist is a solid middle ground. Just be aware that your task content is not encrypted from Todoist’s servers.

Microsoft To Do is fine for those already committed to Microsoft 365, but it does not offer the same level of privacy as Things 3. For sensitive work tasks, you might want to keep a separate, encrypted notes app.

No app is perfect, and privacy guarantees can change. Always check the latest privacy policy and security documentation before committing your data.

Sources

• Wirecutter / The New York Times, “The 3 Best To-Do List Apps of 2026” (December 2025)
• Todoist Security Page (todoist.com/security)
• Things 3 Support: Data Security
• Microsoft Trust Center: Data Protection in Microsoft To Do
• Various news reports on productivity app data sharing (2025–2026)