Dexter — an opinionated day planner for iOS, Android, and the web

The day planner that fixes everything ... just kidding, but it will help you get and stay organized — and it's pretty, too!

Open the web app · Website · The Dexter Method · Connect your AI

What is Dexter?

Dexter fills the gap between planners that are too simple to be useful and ones that are too complicated to use every day. It's carefully crafted to help you get more done while avoiding the trap of busyness — we call this the Dexter Method.

Prioritize with the Eisenhower Matrix, plan your day intentionally, brain-dump to quiet the anxiety, and keep your whole day — tasks, notes, journal, and calendar — in one place.

Features

• Prioritization (an adaptation of the Eisenhower matrix)
• Quick Planner backlog triage — surface tasks that are overdue, due soon, or left behind
• Markdown notes & a customizable journal with reflection prompts
• Calendars in one place — device calendars on mobile, .ics feeds (Google, Outlook, iCloud, …) on web
• Habit tracker
• Goals & milestones — because being busy != being productive
• Repeating tasks
• Native task alarms so nothing slips (iOS 26+, via AlarmKit)
• MCP server — plan alongside Claude, ChatGPT, Gemini, and Cursor
• Customizable themes (dexter, light, dim, dark, abyss) with light/dark/system modes
• One universal app for iOS, Android, and web
• Fully deletable data — no third-party analytics, and we never sell your data
• Week-at-a-glance view
• Focus blocks (Pomodoro technique)
• Full-text search for tasks and notes
• Subtasks
• Fully exportable data

Connect your AI

Dexter exposes a Model Context Protocol server, so any MCP-compatible assistant can plug into your planning data. Plan your day, capture tasks, and review what you wrote in your journal just by asking.

• Server URL: https://api.dexterplanner.com/functions/v1/mcp-server
• Works with: Claude (claude.ai, Claude Desktop, Claude Code), ChatGPT, Gemini CLI, Cursor, and other MCP clients

See the MCP setup guide for connection steps.

For developers

Dexter is a monorepo:

Directory	What it is
/src	Expo (React Native) app — iOS, Android, and web
/supabase	Supabase backend — PostgreSQL + RLS, Auth, and Deno Edge Functions
/www	Lume marketing site for dexterplanner.com
/docs	Engineering documentation

Quick start

Area	Command
App	cd src && npm install --legacy-peer-deps && npm start
Backend	See supabase/README.md
Website	cd www && deno task serve
Docs	Start with docs/frontend.md and docs/backend.md

Contributing

Found a bug or have a feature idea? Open a GitHub issue (or use the in-app Settings menu).

Dexter is maintained by a solo indie developer, so please be kind and patient — features get added when they're something worth maintaining. Pull requests are welcome but never required. If Dexter makes your life a little easier, consider sponsoring the project to help cover hosting (and the occasional matcha latte).

License

Dexter is open source under the MIT License.