# OneTask

> Free task app that syncs Google, Outlook and CalDAV task lists

OneTask is a task and to-do list app for Android, iPhone, iPad, Mac and Windows from the Dutch developer Code Spark. It works as a client for task lists held elsewhere: Google Tasks, Outlook, Office 365, iCloud Reminders and CalDAV servers such as Nextcloud and Synology. Tasks sync directly between the device and the provider, and the store listings, which title it One Task or One Tasks, show it as a free download.

- **Category:** To-Do List Apps
- **Made by:** Code Spark (since 2016)
- **Website:** https://www.onetask.eu
- **Runs on:** iOS, macOS, Windows, Android
- **Facts last checked:** Oct 9, 2026

## Pricing

OneTask is free to use.

- **Pricing model:** Free
- **Free plan:** The app is a free download on the App Store, Google Play and the Microsoft Store. The US App Store listing shows no in-app purchases.
- **Free trial:** None listed.

| Plan | Price | What you get |
| --- | --- | --- |
| Free | $0 | The full app on iPhone, iPad, Mac, Android and Windows, connected to the user's own task accounts. |

Read from https://apps.apple.com/us/app/one-tasks/id1455000420 on Oct 9, 2026. Prices change, so confirm with OneTask before buying.

## Key features

- **Several task providers in one app:** Accounts from Google Tasks, Outlook, Office 365 and iCloud Reminders can be added side by side, so task lists from each appear in one place.
- **CalDAV task lists:** Any third-party CalDAV server can be added with a username, password and server address. Nextcloud, Synology and Mailbox.org have dedicated account types.
- **Subtasks, due dates and reminders:** Tasks can carry subtasks, due dates and reminders, and widgets show tasks outside the app.
- **Offline use:** The site and the Microsoft Store listing both list working offline, without an internet connection, as a feature.
- **Views, search and theming:** The app offers multiple views of task lists, task search and personalized color themes.
- **Direct sync with no vendor server:** The privacy policy says task data is not stored on Code Spark's servers. Google and Microsoft accounts sign in with OAuth 2.0, and the token is stored encrypted on the device.

## Good for

- People with tasks split across Google and Microsoft accounts
- Users of Nextcloud, Synology or another CalDAV server
- Anyone who also uses Code Spark's OneCalendar app

## Worth knowing

- There is no web version; the site lists apps for Android 6 and higher, iPhone, iPad, Mac and Windows 10 and 11 only.
- It has no task service of its own: tasks live in a connected Google, Microsoft, iCloud or CalDAV account.
- Google Play and the Microsoft Store label the app as having in-app purchases, but no listing or vendor page shows a price for one.
- The app is titled One Task on Google Play and the Microsoft Store and One Tasks on the App Store, not OneTask.

## Works with

Google Tasks, Outlook, Office 365, iCloud Reminders, OneCalendar, Nextcloud, Synology, Mailbox.org

**Tags:** Tasks, Works offline

## Alternatives

- [Tasks.org](https://toolgpa.com/tools/tasks-org): Open-source Android to-do list with CalDAV and Google Tasks sync. [Compare](https://toolgpa.com/compare/onetask-vs-tasks-org)
- [Google Tasks](https://toolgpa.com/tools/google-tasks): Google's to-do list, built into Gmail, Calendar, Chat and Docs. [Compare](https://toolgpa.com/compare/google-tasks-vs-onetask)
- [Microsoft To Do](https://toolgpa.com/tools/microsoft-to-do): Free to-do list from Microsoft that syncs with Outlook tasks. [Compare](https://toolgpa.com/compare/microsoft-to-do-vs-onetask)
- [2Do](https://toolgpa.com/tools/2do): Task manager for Mac, iPhone, iPad and Android with no subscription. [Compare](https://toolgpa.com/compare/2do-vs-onetask)
- [TasksBoard](https://toolgpa.com/tools/tasksboard): Full-screen kanban board and list sharing for Google Tasks. [Compare](https://toolgpa.com/compare/onetask-vs-tasksboard)

## Sources

The prices, plans, platforms and features above were read from these pages on Oct 9, 2026:

- https://apps.apple.com/us/app/one-tasks/id1455000420
- https://www.onetask.eu/
- https://www.onetask.eu/download/store
- https://www.onetask.eu/onetask/about
- https://www.onetask.eu/onetask/privacypolicy
- https://www.onetask.eu/support/faq/about_security
- https://www.onetask.eu/support/faq/add-caldav-calendar
- https://play.google.com/store/apps/details?id=biz.codespark.onetask&hl=en_US&gl=US
- https://apps.microsoft.com/detail/9nblggh2jhrg?hl=en-US&gl=US

Page: https://toolgpa.com/tools/onetask
Listed by ToolGPA (toolgpa.com).