Kimai

Open source time-tracking application for freelancers, teams, and organisations, with timesheets, invoicing, and detailed reports.

Open source alternative to:

Toggl

Harvest

Kimai is a free, open source time-tracking application that has been actively maintained for almost two decades. It is a popular alternative to Toggl Track, Harvest, and Clockify for freelancers, agencies, and small companies that want to track billable hours and generate invoices.

Kimai offers a web-based multi-user interface, projects and activities with hourly rates, customer and team reports, JSON API for integrations, and a powerful plugin system. It supports exporting to PDF, XLSX, CSV, and direct invoicing workflows. A self-hosted community edition is fully free, while the vendor offers a SaaS option and optional paid support contracts.

It is built on PHP, Symfony, and Doctrine, runs on MySQL or MariaDB, and is released under AGPL-3.0. Kimai is translated into dozens of languages and is a mature, well-documented choice for time tracking without a subscription.

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Similar open source alternatives

Solidtime

Modern, open source time-tracking app for freelancers and teams with project, client, task, and reporting features.

Alternative to:

Toggl

TimeTracker

A robust, self-hosted time tracking application designed for teams and freelancers who need reliable time management without cloud dependencies. Built with Flask and optimized for Raspberry Pi deployment, TimeTracker provides persistent timers, comprehensive reporting, and a modern web interface.

Alternative to:

Toggl