Which To-Do List Apps Keep Your Tasks Private? A Security-Focused Guide

It sounds like a mundane question, but the answer matters more than most people realize. To-do list apps often hold a running record of your daily life: work deadlines, personal errands, medical appointments, even passwords or ideas you jot down in a note field. If that data leaks or gets sold, it can create real problems—from targeted phishing to unwanted profiling.

Wirecutter’s latest roundup of the best to-do list apps for 2026 focused on features, speed, and cross-platform reliability. That’s useful. But for anyone who worries about where their data ends up, a feature list alone isn’t enough. Below, I’ve taken the same three apps Wirecutter recommends—Todoist, TickTick, and Microsoft To Do—and looked at them through a privacy-and-security lens.

What Happened

In December 2025, The New York Times’s Wirecutter published its annual review of to-do list apps, naming Todoist as the top pick, TickTick as an alternative, and Microsoft To Do as a good option for those already in the Microsoft ecosystem. The review evaluated hundreds of hours of testing and user feedback, but it didn’t dive deep into data collection practices or encryption policies. That’s not a criticism—it just wasn’t the review’s focus.

But given the steady drumbeat of data breaches and the growing sophistication of ad-tracking networks, it’s worth asking: how private are these apps?

Why It Matters

A to-do list is a surprisingly intimate piece of software. You might store your grocery list, but you might also track a job search, a health condition, or a legal matter. If the app’s servers are compromised—or if the company itself mines your data for advertising or AI training—that sensitive information can be exposed or monetized without your consent.

It’s also worth noting that many people use a single app across work and personal life, blurring the line between professional and private tasks. A breach that leaks your employer’s project details could have professional consequences too.

What Readers Can Do: A Privacy Check of the Top Three

I checked the current privacy policies, security documentation, and any publicly reported security incidents for each app as of early 2026. Here’s a snapshot, with the usual caveat that policies can change.

Todoist (the overall Wirecutter pick) encrypts data in transit using TLS, but it does not offer end-to-end encryption. That means Todoist’s servers can read your task data, and the company says it may use aggregate data for product improvement. It also logs IP addresses and device identifiers. On the plus side, Todoist has never suffered a major public breach, and it offers two-factor authentication. For casual task lists, this level of protection is probably fine. For anything you’d want truly private—like a password reminder or a sensitive project—you might want to look elsewhere.

TickTick (the alternative pick) has a similar profile: TLS encryption in transit, no end-to-end encryption, and a privacy policy that permits data collection for analytics and advertising. TickTick also logs your location if you permit it for location-based reminders. In 2024, the company updated its policy to clarify that it does not sell personal data, but it does share non‑personal data with third‑party analytics providers. Two-factor authentication is available only through a third‑party authenticator app. For most users, the privacy risk is low, but the lack of end-to-end encryption means the company could theoretically access your tasks.

Microsoft To Do runs on Microsoft’s cloud infrastructure. Data is encrypted in transit and at rest. However, Microsoft’s broad data collection policies are well documented—the company uses aggregated data to improve its AI features, and it may share data with its subsidiaries. That said, Microsoft offers enterprise-grade security features like conditional access and compliance certifications. For individuals, the privacy trade‑off is similar to using any other Microsoft consumer product: you get robust security, but your data is part of a larger ecosystem that Microsoft uses for product development and, in some cases, targeted advertising (though not for To Do specifically). Two-factor authentication is supported through your Microsoft account.

No app in this group offers full end-to-end encryption, which means your tasks are visible to the company running the service, at least in theory. If that gives you pause, consider a self‑hosted option like Vikunja or a more privacy‑focused app like Tasks.org (Android) that supports end‑to‑end encryption when used with compatible storage providers.

For different user types:

  • Casual users who only track grocery lists and low‑sensitivity tasks: any of the three is fine. Just enable two-factor authentication and review the privacy settings.
  • Security‑focused individuals who need to keep certain tasks private (e.g., health or legal reminders): consider a local‑only app or one that lets you encrypt tasks client‑side.
  • Team users who share task lists at work: if your organization uses Microsoft 365, Microsoft To Do is probably the safest choice because admin controls can enforce policies. For non‑Microsoft shops, Todoist’s business tier offers solid basic security.

General tips for securing your to‑do list data:

  1. Enable two‑factor authentication on your account (all three apps support it).
  2. Review the app’s permission settings: disable location access if you don’t need it.
  3. Be careful what you type into task titles or notes. Treat your to‑do list like a postcard—anyone who works at the company can read it.
  4. Regularly export your data in case you want to switch apps.
  5. Keep the app and your device’s operating system up to date.

Sources

  • Wirecutter’s “The 3 Best To-Do List Apps of 2026” (The New York Times, December 2025).
  • Todoist’s privacy policy and security page (accessed April 2026).
  • TickTick’s privacy policy and security FAQ (accessed April 2026).
  • Microsoft To Do privacy documentation and Microsoft’s Privacy Statement (accessed April 2026).
  • Industry reports on app data breaches (no relevant incidents found for these apps as of early 2026).

Note: Privacy policies can change. The information above reflects publicly available documents as of May 2026. Always check an app’s current policy before choosing to trust it with sensitive data.