Codename Jo

Codename Jo is a native iOS voice assistant that lets you handle email and common work tools by talking. It’s aimed at people who want inbox tasks and tool actions (Slack, GitHub, Notion, and more) to happen without switching apps, while keeping their mail processing on-device.

It’s built around a “talk to it, get work done” flow. Jo can read your mail, summarize what matters, draft and send replies, and help with follow-up actions like archiving and unsubscribing.

• Gmail + inbox tasks: reads your week ranked by importance, summarizes emails, drafts replies, and can send, forward, archive, trash, label, filter, and unsubscribe
• Calendar actions: puts items on your calendar and can read or change calendar details
• Slack calls: walks you through unread Slack items, reads channels and threads, and can send, schedule, react, and mark as read
• GitHub help: pulls issues, PRs, checks, commits, notifications, and workflow runs, with merge and workflow actions gated behind your confirmation
• Notion and Granola: searches and summarizes content, creates and updates notes/pages (with Notion constrained to updates and creations, not deletions)
• Custom tools via MCP: connects to any MCP server you specify, then exposes the server’s tools for Jo to call

What makes it stand out is where the work runs. Jo is “fully client-executed,” meaning ranking, summaries, and decisions run on your phone. It uses your OpenAI API key for voice and reasoning, and it calls Google services directly for Gmail and Calendar. The only third-party server mentioned is a thin, stateless token shim for Google auth, which doesn’t store your mail.