# The One Thing

> The One Thing is a focused to-do list that reduces choice overload by showing one current priority at a time. It is designed for calmer focus and includes accessibility options for neurodivergent users, including OpenDyslexic font support.

The product is available on iOS, Android, and the web. The free plan supports up to 10 active tasks and unlimited completions. One Thing Pro adds unlimited active tasks, editing, reordering, move-to-top, and home-screen widgets. Current subscription pricing is shown in the app before purchase.

## Primary resources

- [Product homepage](https://theonethingapp.com/): Product overview, how it works, accessibility, plans, and downloads.
- [AI and MCP guide](https://theonethingapp.com/mcp): Human-readable connection instructions, available tools, and security model.
- [Journal](https://theonethingapp.com/blog): Articles about focus, ADHD, dyslexia, choice overload, task paralysis, and motivation.
- [Web app](https://web.theonethingapp.com/): Browser version of The One Thing.
- [RSS feed](https://theonethingapp.com/rss.xml): Complete journal feed.
- [XML sitemap](https://theonethingapp.com/sitemap.xml): Canonical crawl index for the site.

## Model Context Protocol access

The One Thing provides a remote OAuth-protected MCP server for user-authorised task access.

- MCP endpoint: https://mcp.theonethingapp.com
- Protected resource metadata: https://mcp.theonethingapp.com/.well-known/oauth-protected-resource
- OAuth authorisation server metadata: https://mcp.theonethingapp.com/.well-known/oauth-authorization-server
- Authentication: OAuth 2.1 authorisation code flow with S256 PKCE
- Supported scopes: `tasks:read`, `tasks:write`
- Account model: Users sign in with their existing The One Thing account. The MCP client receives a revocable OAuth token and never receives the user's app password.

Available MCP tools:

- `list_tasks`: List the signed-in user's active or completed tasks and priority positions.
- `get_task`: Get one task by its task ID.
- `get_completion_trends`: Summarise 1–30 days of task completions in the user's time zone.
- `add_task`: Add a new active task.
- `update_task`: Rename or reprioritise a task. This requires Pro or gifted access.
- `complete_task`: Complete one active task.
- `delete_task`: Permanently delete one task. This tool is explicitly marked destructive.

Every task query and mutation is restricted to the authenticated user. Free-plan limits and Pro entitlements are also enforced through MCP.

## Journal articles

- [How to Focus on One Task at a Time](https://theonethingapp.com/blog/how-to-focus-on-one-task-at-a-time)
- [The Best Kind of To-Do List App for ADHD](https://theonethingapp.com/blog/adhd-todo-list-app)
- [Task Paralysis: Why You Freeze at Your To-Do List](https://theonethingapp.com/blog/task-paralysis)
- [Single-Tasking vs Multitasking](https://theonethingapp.com/blog/single-tasking-vs-multitasking)
- [Dyslexia-Friendly Productivity](https://theonethingapp.com/blog/dyslexia-friendly-productivity-apps)
- [Choice Overload and Decision Fatigue](https://theonethingapp.com/blog/choice-overload-decision-fatigue)
- [Reward Yourself: The Missing Half of Every To-Do List](https://theonethingapp.com/blog/reward-yourself-habit-motivation)

## Product identity

- Product name: The One Thing
- Category: Productivity and task management
- Primary proposition: Keep the whole list available while showing only one current priority.
- Audience: Anyone overwhelmed by long task lists, including people with ADHD or dyslexia.
- Platforms: iOS, Android, web, and remote MCP clients.
- Publisher: Ryland Consulting Limited
- Canonical domain: https://theonethingapp.com