How to Pick a To-Do List App That Won’t Leak Your Data (2026 Guide)

Your to-do list app likely holds more sensitive information than you realize: work deadlines, personal goals, medical appointments, passwords stored in notes, and even bank account numbers for bill reminders. When that data leaks—whether through a breach, a lax privacy policy, or third-party tracking—the consequences can range from embarrassing to financially damaging.

Wirecutter’s 2026 roundup of the three best to-do list apps focused on usability, features, and reliability. But if you’re concerned about digital privacy and data security, you need a different set of criteria. Here’s what you should look for, and how the top three apps compare when it comes to protecting your information.

What Happened

In December 2025, Wirecutter published its annual review of to-do list apps, naming three winners based on extensive testing. The article highlighted each app’s design, cross-platform support, and task management capabilities. However, the review did not dive deeply into privacy or security—understandable for a general-audience guide, but a gap for privacy-conscious users.

Meanwhile, data breaches in productivity apps have continued to make headlines. In 2025, a popular note-taking app suffered a credential-stuffing attack that exposed millions of user notes, serving as a reminder that any service storing your data in the cloud can become a target.

Why It Matters

To-do list apps regularly sync across devices, which means your data travels over the internet and gets stored on company servers. Without strong encryption and transparent data handling, you’re trusting the app provider not to misuse your information or lose it in a breach.

Key security features to look for include:

End-to-end encryption (E2EE) – Only you can read your data; the service provider cannot. This is the gold standard.

Zero-knowledge architecture – The provider has no access to your passwords or the content of your tasks, even if they could decrypt the data.

Minimal data collection – The app should only collect what’s essential for syncing and basic functionality. Avoid apps that share data with advertisers or use your tasks to train AI models.

Regular third-party audits – Independent security reviews help confirm that the company’s claims match reality.

What Readers Can Do

Below is a privacy-oriented comparison of Wirecutter’s top three picks for 2026. The app names and general security profiles are based on publicly available documentation and industry knowledge as of early 2026. (Wirecutter’s review did not include a security breakdown, so this analysis is independent.)

Todoist is feature-rich and widely used, but its default encryption is not end-to-end. The company does offer a beta E2EE option, but it remains experimental and not enabled by default. Task content is stored on Todoist’s servers and can be accessed by the company (e.g., for spam filtering). If you need to share tasks with others, E2EE breaks that functionality.

Things 3 takes a different approach: tasks are stored only on your device. Sync happens through Apple’s iCloud, which uses end-to-end encryption by default. This means neither Things nor Apple can read your tasks. The trade-off is that Things is only available on Apple devices and has no web app. Collaboration is limited to others who also own Things.

TickTick offers strong server-side encryption but shares task content with its analytics and personalization systems. The free tier includes ads, which raises further privacy concerns. TickTick has not undergone a public third-party security audit in recent years, and its privacy policy allows data sharing with affiliates.

Our Recommendation for Privacy-Conscious Users

If you value privacy above all else and work within the Apple ecosystem, Things 3 is the clear winner. Its device-first storage and iCloud E2EE mean your tasks never touch a server where they could be exfiltrated.

If you need cross-platform access and collaboration, Todoist is a reasonable choice provided you enable E2EE through the beta setting and understand the limitations (no file attachments, no natural language parsing, and no sharing when E2EE is on). For most users who stick with the default mode, it’s important to know that Todoist can read your tasks.

TickTick is best avoided if privacy is a priority, unless you can accept the data collection trade-offs for its extra features like habit tracking and Pomodoro timer.

General Tips to Secure Your To-Do List Data

Regardless of which app you choose, follow these practices:

• Use a strong, unique password and enable two-factor authentication (2FA) if supported.
• Review the app’s privacy policy for mentions of data sharing with third parties.
• Avoid storing passwords, PINs, or full credit card numbers in task notes. Use a dedicated password manager instead.
• Regularly export your data as a backup in case the service shuts down or you decide to switch.
• Keep the app updated to receive security patches.

Sources

• Wirecutter, “The 3 Best To-Do List Apps of 2026,” The New York Times, December 2025. (General recommendations; no security analysis.)
• Todoist official documentation on encryption (todoist.com/security).
• Things support article on iCloud sync and privacy (culturedcode.com/things/support/articles/icloud-sync).
• TickTick privacy policy and security page (ticktick.com/about/security).
• Mozilla Foundation’s Privacy Not Included guide to productivity apps (2025 edition).

Note: App features and policies change. Verify the latest details on each company’s website before making a decision.