A self-hosted, open-source productivity app built on Getting Things Done
Tandem GTD started because I needed a system to manage the complexity of launching a bespoke fashion studio – pattern drafting, client fittings, fabric sourcing, software development, school projects, all running in parallel. Every productivity tool I tried either treated GTD as a checkbox feature or locked my data in someone else's cloud. So I built the right thing myself.
It's a faithful implementation of David Allen's Getting Things Done methodology – not a generic task manager with GTD bolted on. Weekly Reviews, cascading next-actions, Horizons of Focus, and context-based filtering are foundational architecture, not afterthoughts.
What Makes It Different
- Self-hosted -- your GTD data is the most intimate map of your life. That data belongs on your hardware, not someone else's cloud.
- GTD-pure -- built around the methodology from the ground up. Contexts, next actions, horizons of focus, weekly review, someday/maybe, waiting-for -- all of it.
- AI-native -- MCP server integration means Claude or ChatGPT can work directly with your GTD system at zero additional cost.
- Community-scale – flat-fee per instance, not per seat. Run it for your family, your nonprofit, your team. Everyone gets in.
- "What Should I Do Now?" – the killer feature. Tell it where you are, how much time you have, and what energy you're bringing. It tells you the most important thing to work on.
Core Features
- Inbox capture and guided processing with two-minute rule support
- Automatic next-action cascade engine
- Sequential and parallel project management
- Context-based task filtering (@computer, @phone, @errands)
- Energy level and time estimate matching
- Horizons of Focus -- from daily actions to life purpose
- Guided weekly review workflow with optional AI coaching
- Waiting-for tracking
- Someday/Maybe lists
- Built-in wiki with [[wikilink]] syntax and version history
- Activity feed and cascade tracing
- Multi-user collaboration with private data protection
Links
- Website: tandemgtd.com
- Source: github.com/courtemancheatelier/tandem-gtd
- License: AGPL-3.0 -- self-host freely, no strings attached
Built by: Jason Courtemanche / Courtemanche Atelier
Year: 2026 – present
Type: Open-source software
Status: Active – private beta
Built in a workshop, not a boardroom. Tandem GTD is one of the ventures under the Courtemanche Atelier umbrella.