Kimai vs Watson
A side-by-side comparison of two self-hosted time tracking options — licensing, setup difficulty, resource needs, and what each one replaces.
Kimai
Professional time tracking for teams and freelancers
VS
Watson
Command-line time tracker with projects, tags, and reports
| Feature | Kimai | Watson |
|---|---|---|
| Deploy effort | Under-an-hour setup | Read-the-docs project |
| Health score | 90 · Excellent | 43 · Fair |
| Category | Time Tracking | Time Tracking |
| License | AGPL-3.0 | MIT |
| Language | PHP | Python |
| Setup difficulty | Medium | Easy |
| Min. RAM | 512 MB | 64 MB |
| Deployment | docker, bare-metal, source | binary, source |
| GitHub stars | ★ 5,039 | ★ 2,538 |
| First released | 2006 | 2015 |
| Replaces | Toggl, Harvest, Clockify | Toggl, Harvest |
What are Kimai and Watson?
Kimai
Kimai is a free, web-based multi-user time tracking application. It tracks work time across projects and activities and generates invoices and exportable reports.
- Multi-user time tracking
- Invoice generation
- Detailed reporting and exports
- Plugin marketplace
Watson
Watson is a command-line time tracker written in Python. It records time frames per project with tags, stores data in local files, and generates reports and aggregates for billing or analysis. Maintained under the Jazzband organization.
- Command-line time tracking
- Project and tag support
- Detailed reports and aggregates
- Cross-platform
Kimai vs Watson: key differences
Kimai is written in PHP, while Watson is built with Python. Licensing differs — AGPL-3.0 for Kimai versus MIT for Watson. Watson is the lighter option, starting around 64 MB of RAM against 512 MB for Kimai. Kimai is the more established project (first released 2006), while Watson arrived in 2015. Kimai lists first-class Docker deployment; Watson does not.
Why pick each one
Choose Kimai if…
- Mature and actively maintained
- Strong invoicing features
Watch out for
- Configuration can be involved
Choose Watson if…
- Released under the MIT license
- Easy to set up — beginner-friendly
- Active community (2.5k GitHub stars)
- Written in Python
Frequently asked questions
Is Kimai or Watson better?
Neither is universally better. Kimai has the larger community, while Watson is simpler to set up (easy difficulty). Choose based on the comparison table above and your own setup.
Are Kimai and Watson free and open-source?
Yes. Kimai is licensed under AGPL-3.0 and Watson under MIT. Both can be self-hosted at no software cost.
Can I run Kimai and Watson with Docker?
Kimai: yes. Watson: check the project docs for container support.
Which is lighter on resources, Kimai or Watson?
Watson has the smaller minimum footprint at 64 MB of RAM, compared to about 512 MB for Kimai. Real-world usage depends on library size, user count, and enabled features.