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Atomic

Atomic is free, open-source scheduling software that runs as a self-hosted service.

Place
#18 of 24
Score
5.5
Atomic's website

What Atomic is

Atomic is free, open-source scheduling software that runs as a self-hosted service. It is designed as a priority-driven AI scheduler for calendar and time-planning problems. You can use natural-language ChatGPT conversations to teach the system about your calendar, find or block time, and create, schedule, or update events. Semantic search matches phrases against trained past events and can reuse details such as duration, color, time preferences, priority, and tags. An AI classification model applies tags using each tag’s matching settings. Atomic handles recurring one-to-one meetings and ad hoc team meetings by considering attendees’ calendars and time preferences, including people who do not use Atomic. Its planner can run before the workday and apply patterns learned from event templates. Time blocking supports priority-based blocks with daily or weekly deadlines and soft or hard deadline choices. Training existing events is required for semantic templates. Docker Compose self-hosting is described as privacy-enabled by default and customizable.

Good

  • Free and open-source
  • Natural-language calendar planning
  • Priority-based time blocking
  • Supports recurring and ad hoc meetings
  • Self-hosted Docker Compose setup

Watch out

  • Requires training existing events for semantic templates
  • Self-hosted deployment is required
  • Microsoft Outlook integration is only listed as planned

Who it suits

Atomic suits people who want a self-hosted, natural-language calendar assistant with priority-based planning. It is also aimed at teams scheduling meetings across attendees, including non-Atomic users.

Verdict

Atomic combines calendar chat, event search, meeting coordination, tagging, and automated planning in a self-hosted package. It fits users comfortable training and operating their own scheduling service.

Plans and prices

From Atomic's own pricing page, checked 4 Oct 2026.

All about pricing
PlanPriceWhat it gives you
Customized Atomic for your team on your cloud$15 a monthSame features as cloud hosted version · $15 / month support afterwards; 1 year support included

The facts

Each one read from Atomic's own pages, with the date it was checked.

What it does

Automated tagging
An AI classification model can apply tags, each with its own settings for matching events.checked 4 Oct 2026
Autopilot
The AI planner can run automatically before the workday and apply features learned from trained event templates.checked 4 Oct 2026
Calendar assistant
The project says users can chat with their calendar using ChatGPT to teach, find, block, create, schedule, and update events.checked 4 Oct 2026
Calendar integration
The README’s meeting-assist diagram shows Google Calendar receiving an optimally selected meeting slot and event.checked 4 Oct 2026
Cloud support
The cloud-hosted version is described as prioritized and including full customer support and bug fixes.checked 4 Oct 2026
Flexible meetings
Atomic supports recurring one-to-one and ad hoc team meetings that account for attendees’ calendars and time preferences, including non-Atomic users.checked 4 Oct 2026
Purpose
Atomic describes itself as an open-source, priority-driven AI scheduler for solving time and scheduling problems.checked 4 Oct 2026
Self-hosting
Atomic offers a self-hosted Docker Compose setup and describes self-hosting as privacy-enabled by default and customizable.checked 4 Oct 2026
Semantic search
Semantic search matches phrases to trained past events and can reuse attributes such as duration, color, time preferences, priority, and tags.checked 4 Oct 2026
Time blocking
Users can set priority-based calendar blocks for tasks with daily or weekly deadlines and choose soft or hard deadlines.checked 4 Oct 2026
Training requirement
Semantic event templates require training Atomic on existing events first.checked 4 Oct 2026

The company

Maker
The repository’s support section says the maker is spending 100% of their work time on the project and is setting up GitHub Sponsors.checked 4 Oct 2026

Money

Planned integrations
The README lists Microsoft Outlook Calendar integration, SSO for teams, and ChatGPT integration for a Premium version in its roadmap.checked 4 Oct 2026

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