Which To-Do List App Keeps Your Tasks (and Data) Safe? A Practical Guide

If you use a to-do list app regularly, you’ve probably given it a fair amount of personal information: work projects, grocery lists, perhaps even passwords or health reminders. Productivity apps have become indispensable, but they also store data that, if mishandled, could expose your habits, plans, or contact details. A few high-profile breaches in the productivity space over the past two years have made it clear that features alone aren’t enough—you need to consider where your data lives and who can access it.

This guide looks at the three to-do list apps recommended by Wirecutter in their 2026 review—Todoist, TickTick, and Microsoft To Do—and examines them from a security and privacy perspective, not just a usability one.

What Happened: The 2026 Wirecutter Picks

In late 2025, Wirecutter published its annual evaluation of to-do list apps. After testing more than a dozen contenders, they identified three winners: Todoist for its flexibility and cross-platform support, TickTick for its built-in habit tracking and calendar view, and Microsoft To Do for its tight integration with Office 365 and simple interface. The review focused almost entirely on features, design, and reliability—which is understandable, because that’s what most people search for. But security details were left to footnotes and privacy policies.

Why Privacy and Security Matter for Task Apps

A to-do list app seems harmless, but think about what you put in it. Meeting notes, travel itineraries, passwords for shared accounts, and personal reflections are common. If the app stores this data in the cloud without strong protections, it could be exposed in a breach or accessed by the company itself for purposes you didn’t agree to (such as training AI models). For people who use a single app for both work and personal tasks, the risk is even higher—corporate policies around data handling may differ from consumer terms.

How the Three Apps Compare on Security and Privacy

Todoist encrypts data in transit (while it’s moving between your device and their servers) and at rest (when it’s stored), but it does not offer end-to-end encryption. That means Todoist employees—or anyone who gains access to their servers—could theoretically read your task data. According to their privacy policy, they also collect usage data and may share it with third-party analytics providers. Their servers are in the US and EU, which gives you some geographic control.

TickTick takes a different approach: optional end-to-end encryption for notes and lists. When enabled, the encryption keys stay on your device, so even TickTick cannot decrypt your data. The catch is that this feature is not turned on by default—you have to go into the settings and enable it for each device. Many users don’t realize it exists. TickTick also collects more data than Todoist in some areas, including device identifiers and crash logs.

Microsoft To Do syncs through Exchange Online, which uses Microsoft’s enterprise-grade security infrastructure. That means compliance with standards like SOC 2 and ISO 27001, and strong encryption in transit and at rest. However, Microsoft itself can access your data. Although the company has strict privacy policies and does not use customer content for ads or training, the fact remains that the data lives on Microsoft’s servers and is subject to law enforcement requests. For users inside an organization, IT administrators may also have access.

None of these apps currently offer a true “zero knowledge” architecture by default. If that’s a must-have for you, you would need to look at niche apps like Standard Notes or a self-hosted solution like Vikunja.

Practical Steps to Protect Your To-Do List Data

You don’t have to switch apps to improve your security posture. Here are a few things you can do right now:

  • Check your encryption settings. In TickTick, go to Settings → Security → Enable end-to-end encryption. In Todoist, there is no such option—be aware of that limitation.
  • Limit what you store. Avoid putting passwords, financial account details, or full addresses into task descriptions. Use a dedicated password manager for sensitive info.
  • Review app permissions. On your phone, revoke unnecessary permissions like camera, contacts, or location for the to-do app.
  • Enable two-factor authentication (2FA). All three apps support 2FA. Turn it on to reduce the risk of account takeover.
  • Use a separate account for work vs. personal tasks. If your employer provides Microsoft To Do through Office 365, keep your personal tasks in a separate app or account.
  • Read the privacy policy. It’s tedious but doing a quick search for “data sharing” or “third party” in the policy will tell you whether your usage data is being sold or used for advertising.

Sources

  • Wirecutter, “The 3 Best To-Do List Apps of 2026,” December 2025.
  • Todoist Privacy Policy (accessed May 2026).
  • TickTick Privacy Policy (accessed May 2026).
  • Microsoft Privacy Statement (accessed May 2026).