One Big Thing
The simplest todo app
Only for iPhone
Free · Designed for iPhone. Not verified for macOS.
iPhone
A Todo app with ONE big difference. Set an intention for your day with one big thing.
Review your previous Big Things.
Receive notifications to remind you to check in on your big thing, and mark it as complete if you've done it.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Compiled for iOS26
The developer, Thomas Chatting, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Thomas Chatting
- Size
- 1.1 MB
- Category
- Productivity
- Compatibility
Requires iOS 17.6 or later.
- iPhone
Requires iOS 17.6 or later. - Mac
Requires macOS 14.6 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.3 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2025 Thomas Chatting