Use Notii from Claude or ChatGPT
Settings → Connected apps has Notii's plugins for Claude and ChatGPT and Notii's address for apps (MCP). The first time an app uses Notii, Notii's page opens: check it's your account and select Allow. When the app takes it from there (a desktop app does), the page says the app is connected and you can close the tab.
Claude: download the Claude plugin, then in Claude open Customize → Plugins → Add → Upload plugin and choose it. Then, in a chat, open Notii there and Connectors → notii → Add, then Connect and Allow. (In the desktop app's Code tab, Connect stays greyed out until a Code session is open.) The plugin adds skills: /notii:capture saves a conversation as a note, /notii:today plans your day and /notii:find answers from your notes. Only want the connection? Add the address under Settings → Connectors → Add custom connector in Claude.
Claude Code: copy the install command from Settings → Connected apps, run it, then /mcp → notii → Authenticate.
ChatGPT: open Plugins, select + and Add custom MCP server, name it Notii, paste the address, choose OAuth, then Create as a plugin and Allow. The ChatGPT plugin (from Settings → Connected apps) adds the same skills in the ChatGPT desktop app and Codex. If ChatGPT hasn't asked you to sign in yet, ask it something about your notes: it asks the first time it uses Notii.
Searches, task lists, the calendar and saved notes show as Notii cards in the chat, and you can tick tasks off right in the card.
Connected apps can search and read your notes, create and edit notes, add tasks, use your calendar, fill in project fields, set up rules and lay out canvases. Disconnect an app from the same card.