Which To-Do List Apps Keep Your Data Safe? Privacy Check for 2026’s Best

If you rely on a to-do list app to manage work projects, grocery runs, and personal goals, you’re trusting it with a surprisingly detailed picture of your life. Task names, deadlines, recurring habits, and even private notes all live inside that app. Yet most app roundups focus on features and design, not on how well they protect that data.

Wirecutter’s latest review of productivity apps, published in December 2025, named three top picks: Todoist, TickTick, and Microsoft To Do. The review is thorough on usability, syncing, and cross-platform support. But it doesn’t dive into the privacy and security trade-offs each one makes. Given recent data breaches and growing scrutiny of app permissions, it’s worth asking: how safe are these daily planners?

Let’s walk through what each of these apps does — and doesn’t — do to keep your data secure.

What happened

The New York Times’s Wirecutter team updated its guide to the best to-do list apps in late 2025, calling Todoist, TickTick, and Microsoft To Do the standouts. The guide is based on hands‑on testing and user feedback, and it covers everything from natural language entry to collaboration features. But the privacy policies and security settings of these apps vary widely, and they’re not always obvious in a standard review.

Why it matters

Todoist, TickTick, and Microsoft To Do store your tasks, schedules, and sometimes notes on their servers so they can sync across devices. That means the companies — or anyone who gains access to their systems — could read your data. If you use these apps for work, you might be exposing confidential project information. If you use them for personal planning, you’re sharing your daily routines, health reminders, and travel plans.

The risks aren’t theoretical. In the past few years, popular productivity apps have suffered breaches that exposed user data. Others have been criticized for vague data retention policies or for requesting permissions (like access to contacts or location) that aren’t needed for basic task management.

What readers can do

You don’t need to be a security expert to make smarter choices. Here’s a simple checklist to evaluate any to-do app — including the three Wirecutter recommends — before you commit:

  1. Check for encryption at rest and in transit. End‑to‑end encryption (E2EE) means only you can read your data. Todoist, for example, offers E2EE only on its premium tier. Free accounts are encrypted in transit but not end‑to‑end, meaning Todoist’s servers can see your task list. TickTick uses standard encryption but hasn’t published detailed audits. Microsoft To Do relies on Microsoft’s enterprise‑grade infrastructure, which protects data with TLS in transit and at rest, but like Todoist, it’s not fully end‑to‑end unless you use certain Office 365 configurations.

  2. Look for two‑factor authentication (2FA). All three apps support 2FA, but how easy it is to set up varies. TickTick and Todoist offer it through authenticator apps; Microsoft To Do integrates with your Microsoft account’s 2FA. Enable it — it’s one of the simplest ways to lock out attackers.

  3. Read the privacy policy’s section on data collection and sharing. TickTick has been noted for ambiguous language around data retention and third‑party analytics. Todoist collects usage data and may share it with processors and advertisers, though it allows you to opt out of some tracking. Microsoft To Do is part of Microsoft’s consumer privacy framework, which means your data is used to personalize ads unless you turn off that setting in your account.

  4. Review app permissions on your phone. Does a to‑do list app really need access to your camera, microphone, or contacts? If it requests something that seems unnecessary, deny it. Even legitimate features like attaching photos should be optional.

  5. Consider your threat model. If you’re a journalist or activist managing sensitive information, a fully encrypted tool like Standard Notes or tiddlywiki might be better — but they lack the polish and ecosystem of the mainstream apps. For most people, enabling 2FA, limiting sharing, and using a strong, unique password is enough.

  6. Test the free tier before paying. Many privacy features (like E2EE or advanced sharing controls) are gated behind a subscription. Make sure the free version gives you the security baseline you need.

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