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Kimai

kimai/kimai
Official cloud The vendor offers a hosted version: sign up and use it without deploying anything. Free tier or trial depends on the vendor.

Kimai is the #1 open-source time-tracking application. From freelancers to companies and organisations - everyone can manage timesheets, generate reports, create invoices and so much more... Web-based multi-user application, available as On-Premise or SaaS version: https://www.kimai.org

Time trackingBilling
Kimai website screenshot

From the README

Kimai is a professional grade time-tracking application, free and open-source. It handles use-cases of freelancers as well as companies with dozens or hundreds of users. Kimai was build to track your project times and ships with many advanced features, including but not limited to:

Stars
★ 5.0k
Language
PHP
License
AGPL-3.0
Last updated
2026-09-22
Category
Finance & invoicing
Section
🌏 Going global