Offline todo app
Your list should not disappear with the Wi-Fi.
Argon keeps a working copy of your workspace on the device in front of you. Start without an account, close the tab, come back later and keep planning without a connection.
Free on the web. No sign-up, no card, no trial timer.
What works offline
Create and organize
Add todos and events, make sections, reorder work and move items between lists.
Plan time
Add dates, deadlines and repeating schedules, then work through Focus, Upcoming and your projects.
Keep context
Write notes, add links and keep the details beside the task they belong to.
Use the keyboard
Quick Find, creation, editing and optional Vim navigation keep working without a network round trip.
How it is stored
Without sync
Your workspace is stored in an on-device IndexedDB database. No Argon account or email address is required, and your changes are not sent to Argon's cloud. The web app and the macOS app can both run as local workspaces.
With optional sync
Your device still keeps a local working copy. Changes made offline queue and sync when the connection returns. An account is required so Argon can identify your devices. Sync is a one-time $25 purchase, not a subscription.
One caveat
Browser storage can be cleared by you, your browser or device management software. If the workspace matters across devices, or you want a cloud backup, turn on Argon Sync.
What still needs the internet
Cloud sync
New changes can be made offline, but another device cannot receive them until Argon reconnects.
Connected services
Google Calendar and Linear need a connection to authorize, fetch and refresh their data.
Purchases and updates
Unlocking sync, downloading an app update and signing in all require a working connection.
Who it suits
A good fit if you want
Todos, projects, deadlines and calendar context in one personal workspace; local control, starting without an account and working offline; remappable shortcuts and global quick capture on macOS; free locally, with an optional one-time sync unlock.
Look elsewhere if you need
Team collaboration, an Android or Windows app today, built-in voice capture, or a large integration catalogue. Argon is a personal workspace, the desktop apps beyond macOS are planned rather than available, Apple Reminders is the simpler choice for deep Siri integration, and Todoist connects to more outside services.
Product behaviour checked against the Argon web app on 30 July 2026.