What is the best open-source employee monitoring software?

For true employer-side monitoring with a manager dashboard, Cattr is the closest open project, though its licence is source-available (SSPL), not OSI-approved open source. ActivityWatch is the best genuinely open-source activity tracker but is built for individuals, not central team monitoring. The right pick depends on whether you can self-host and what you actually need to see.

Is ActivityWatch employee monitoring software?

Not in the employer sense. ActivityWatch (MPL-2.0) is an excellent open-source tool for tracking your own activity locally, but its data stays on each device with no central manager dashboard or team rollout out of the box. Many roundups mislabel it as team monitoring; it isn't.

Is open-source employee monitoring software really free?

The licence is free, but running it is not. You take on server hosting, installation and configuration, security patching and upgrades, agent upkeep as operating systems change, and — importantly — you become the data controller with no vendor SOC 2 report or DPA. 'Free' moves the cost from a licence line to your IT labour line.

Is SSPL the same as open source?

No. The SSPL (used by Cattr) is source-available but is not approved as open source by the Open Source Initiative. For internal employee monitoring its copyleft usually doesn't trigger, since you're not reselling the tool as a service — but it's accurate to call it source-available, not open source.

Should I self-host or use a hosted monitoring tool?

Self-host if you have IT capacity, a data-residency requirement, and want full control. Choose a hosted tool if you'd rather not run servers, need compliance artefacts like SOC 2 and a DPA, or want silent fleet deployment and support. Most small and mid-size teams are better served hosted.

Open-Source Employee Monitoring Software (2026)

An accurate 2026 guide to open-source employee monitoring software — real projects with verified licenses, what each does, and the hidden cost of self-hosting.

Search "open-source employee monitoring software" and most roundups get three things wrong: they pad the list with abandoned hobby repos, they mislabel source-available licences as "open source," and they call tools "monitoring" that only track your own activity locally. This is the accurate version — real projects, verified licences, what each one actually does, and the honest cost of running it yourself.

First, two distinctions that matter

Open source vs source-available. True open source is OSI-approved (MIT, GPL, AGPL, MPL). Some tools marketed as "open source" use the SSPL, which is source-available but not OSI open source. It's a real, usable licence — just describe it accurately.
Personal activity tracker vs employer monitoring. Some of the most popular "open-source monitoring" tools track your own activity on your own machine, with no central dashboard. Great for individuals; not a fleet-monitoring tool. We flag which is which.

The genuinely open (and source-available) tools

Tool	Licence	What it actually does	Honest fit
ActivityWatch	MPL-2.0 (OSI)	Local automatic activity tracking (active window, apps, AFK); Win/Mac/Linux	Individuals wanting private local tracking — no central manager dashboard
Cattr	SSPL (source-available)	Screenshots, activity detection, app/URL tracking, manager dashboard; self-host	Closest OSS to real employer monitoring — if you have IT to run it
Kimai	AGPL-3.0 (OSI)	Multi-user manual time tracking, timesheets, invoices	Agencies billing hours — not monitoring (no screenshots/passive capture)
Ever Gauzy	AGPL-3.0 (OSI)	All-in-one business suite incl. time tracking + screenshots	Teams wanting a self-hosted ERP/HR/PM suite — heavy to run
Tockler	GPL-2.0 (OSI)	Active-window + idle timeline; Win/Mac/Linux	Individual, single-machine, local only
OrangeHRM	GPL (OSI)	Full HR lifecycle (records, leave, time)	HRMS, not surveillance — see our free-HR note below

A caution the other lists skip: most "open source employee monitoring" GitHub results beyond these are student projects or abandoned repos — no licence, no maintenance, unrunnable in production. We left them off on purpose.

The hidden cost of self-hosting (stated plainly, not as FUD)

Open-source software is free to license. Running it as your monitoring system is not:

Servers and hosting — a box to run it on, plus a database (often PostgreSQL).
Install & configuration — Docker/PHP/Postgres setup, and re-doing it per OS for the agents.
Security patching & upgrades — you own every CVE and version bump.
No vendor support or SLA — when it breaks at month-end, you're the support team.
No compliance artefacts — no SOC 2 report, no DPA. You become the data controller, which under regimes like India's DPDP Act or GDPR is a real responsibility, not a checkbox.
No silent fleet deployment — no MDM package to push the agent across 200 machines.

None of this makes open source wrong — it makes it a trade of a licence fee for IT labour. Know which one is cheaper for your team.

When open source fits — and when hosted wins

If you're on the hosted side of that line but still want the open-source values — privacy, transparency, no lock-in feel — that's the gap ProdView fills: it measures activity metadata (not content), screenshots optional, employees see their own data, one lightweight agent on Windows, macOS and Linux, SOC 2 Type II, and a free tier for 3 seats. You get the privacy-first posture without becoming your own sysadmin and data controller. For the full hosted field, see best employee monitoring software.

The bottom line

The best open-source employee monitoring software depends on a single honest question: can you run it? If yes and you need self-hosting, Cattr and Ever Gauzy are the real options — just budget the IT labour and own the compliance. If not, a privacy-first hosted tool gives you most of the same values without the server room. Either way, insist on accuracy: a tool that tracks only your own machine isn't team monitoring, and source-available isn't the same as open source.

Want the hosted, privacy-first path without self-hosting? Start a free ProdView tenant (3 seats, no card).

Licences and project details verified via GitHub as of July 2026; projects change, so confirm the current licence and maintenance status before you deploy. This is general information, not legal advice.