Yesterday, today, and tomorrow. Summarized by Claude or ChatGPT every morning, waiting on your iPhone and Mac.
On the App Store now for iPhone and Mac.
Every morning a scheduled task in your own Claude or ChatGPT account reads your calendar, inbox, and Slack, writes a short summary, and publishes it to Three Days. The app shows it as three tabs.
Finally, a daily summary that you get a notification about on your Mac or iPhone, and if you'd like, a Home Screen widget on your iPhone too. Simple glances for Yesterday, Today, and Tomorrow.
What mattered, plus yesterday's own summary kept exactly as it was published. An archive, not a rewrite.
A one-line headline, the urgent issues in priority order, and today's schedule in time order.
What's known about tomorrow: the headline, what to prepare, and tomorrow's schedule.
Three parts. Your data never leaves your Claude or ChatGPT account; only the finished summary travels.
A scheduled task in Claude or ChatGPT runs each morning with the connectors you already use: calendar, mail, Slack. It gathers, thinks, and writes the summary.
The assistant publishes through the Three Days connector, an MCP server at threedays.net. It stores the summary for you, keeps a few days of history, and sends a push to your devices.
Each app works on its own: sign in with Apple and it shows your summary. Use both and the same Apple ID shows the same three days everywhere, with a Home Screen widget on the iPhone.
About five minutes. You'll need a Claude or ChatGPT plan with custom connectors and scheduled tasks.
Prefer to watch? Pick your device and assistant:
Download Three Days from the App Store for your iPhone, your Mac, or both. Open it and tap Sign in with Apple. Want a look first? Tap Explore a sample day on the welcome screen.
Claude: open Customize → Connectors → Add custom connector. Name it Three Days, paste https://threedays.net/mcp, then tap Add and Connect.
ChatGPT (paid plan): open Settings → Apps & Connectors → Advanced settings and turn on Developer mode, then Create a connector named Three Days with the same URL and OAuth.
A page opens with a six-character code. Tap Open Three Days on it, or enter the code in the app under Settings → Approve a connection, and approve. Your assistant is now linked to you, with no passwords or keys to copy.
In Claude or ChatGPT, make a new scheduled task for each morning, enable the Three Days connector plus your calendar, mail, and Slack connectors, and paste these instructions. They never need to change; the connector supplies the details on every run.
Run the task once to try it (in Claude, tap Run now). Within a minute or two the app fills in, the widget updates, and from then on it happens by itself every morning. Add the widget from your home screen, and sign in with the same Apple ID in the Mac app to see the same three days there.
Only what you see in the app.
Read the full privacy policy · Delete everything any time from Settings → Account in the app.
