OSI-licensed open source
Time tracking software records where hours go, for client billing, project costing or personal productivity. Open-source tools let you self-host the data and avoid per-seat pricing, and they range from team timesheet apps to automatic trackers and developer-focused coding stats.
Every tool on this page is free to use and OSI-licensed, with the licence confirmed on its repository this run. They fit freelancers, agencies and developers who want ownership of their tracking data.
Tools, licences and pricing checked against vendor and repository pages on November 7, 2026.
| Tool | Best for | Pricing | Licence |
|---|---|---|---|
| Kimai | Teams and agencies needing timesheets, rates and invoices | Free, open source (self-hosted) | AGPL-3.0 |
| Solidtime | Freelancers and agencies wanting a modern UI | Free, open source (self-hosted) | AGPL-3.0 |
| ActivityWatch | Automatic personal tracking with data kept local | Free, open source | MPL-2.0 |
| TimeTagger | Simple tag-based tracking | Free, open source (self-hosted) | GPL-3.0 |
| Traggo | Self-hosted tag-based tracking with dashboards | Free, open source (self-hosted) | GPL-3.0 |
| Super Productivity | Developers who combine tasks and time tracking | Free, open source | MIT |
| Wakapi | Tracking coding time across editors | Free, open source (self-hosted) | MIT |
Best for: Teams and agencies needing timesheets, rates and invoices · Free, open source (self-hosted)
Kimai is an open-source multi-user time-tracking application for timesheets, reports and invoices, available on-premise or as a hosted service.
Best for: Freelancers and agencies wanting a modern UI · Free, open source (self-hosted)
Solidtime is an open-source time tracker for freelancers and agencies with a modern interface.
Best for: Automatic personal tracking with data kept local · Free, open source
ActivityWatch is a free and open-source automated time tracker that is cross-platform, extensible and privacy-focused.
Best for: Simple tag-based tracking · Free, open source (self-hosted)
TimeTagger is an open-source web-based time tracker that uses tags instead of projects.
Best for: Self-hosted tag-based tracking with dashboards · Free, open source (self-hosted)
Traggo is a self-hosted tag-based time tracking server.
Best for: Developers who combine tasks and time tracking · Free, open source
Super Productivity is an advanced to-do list app with integrated timeboxing and time tracking, connecting with issue trackers including Jira, GitLab, GitHub and OpenProject.
Best for: Tracking coding time across editors · Free, open source (self-hosted)
Wakapi is a minimalist, self-hosted WakaTime-compatible backend for coding statistics.
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| If you need… | Start with |
|---|---|
| Team timesheets and invoices | Kimai, Solidtime |
| Automatic tracking | ActivityWatch |
| Tag-based tracking | TimeTagger, Traggo |
| Tasks plus time | Super Productivity |
| Coding stats | Wakapi |
Quick answers to common questions
The software is free to self-host, but you pay for hosting and maintenance. Some projects also sell hosted versions.
Kimai offers timesheets, reports and invoices; Solidtime targets freelancers and agencies.
ActivityWatch tracks automatically and keeps data under your control.
ActivityWatch and Super Productivity are applications you run locally; the others are self-hosted servers.
List it on TechLogHub and we'll review it for this guide.
