A practical shortlist starting point for buyers evaluating open source employee monitoring software platforms.
5 tools ranked|5 publish a price|Updated Sep 25, 2026
How to use this ranked shortlist
Start here if the category is already clear and the team now needs a more opinionated list of tools to pressure-test. The goal is not to accept a universal ranking. It is to reduce the field to the products that deserve real time from operations, finance, and procurement stakeholders.
Buyers should compare deployment fit, pricing logic, trial availability, and how much operational effort the product is likely to require after rollout. Those are usually stronger separators than the headline feature list.
The ranking draws on the current category dataset, each product’s own dated pricing research, review coverage, and the broader category guide, so the shortlist is grounded in fit rather than feature theater.
Best tools at a glance
All 5 ranked tools, four columns. Tool links to the full profile. Published price shows a figure only where the vendor publishes one, and reads “quote only” where pricing is behind a sales call. Best for and Main tradeoff are each tool’s own authored lines, so the row states who it suits and what you give up by choosing it.
Showing 5 of 5
All 5 ranked open source employee monitoring software tools, with each tool's published price, who it suits best, and its main tradeoff.
ActivityWatch suits individuals, freelancers and developers on Windows, macOS, Linux or Android who want automatic records of their own computer use, and teams that let each member track privately for self-review or to fill in timesheets elsewhere.
Kimai suits agencies, consultancies, software shops and NGOs of roughly 5 to 200 people that bill or report hours by customer and project and want to own their time data.
TimeTrex is best for operations and people teams at SMB and mid-market companies that want structured time tracking, attendance, and workforce visibility while keeping control of where their data lives.
TimeTrex commercial pricing requires validation before you can plan budget
OrangeHRM suits HR managers at small and mid-size companies, including healthcare, manufacturing and education employers, who want a full HRMS with employee records, leave, time and recruiting under their own control rather than inside a closed cloud product.
Sentrifugo is best for small and mid-sized teams that want a free, self-hosted way to track time, activity, attendance, and workforce visibility while keeping people data inside infrastructure they control.
Sentrifugo has no paid or supported plan
Tools worth deeper evaluation
This list is meant to reduce the field, not pretend every team should buy the same platform. Use the rows below to compare review signal, commercial fit, and the likely operational shape of each tool before you move into demos or procurement.
ActivityWatch sits oddly in an employee monitoring category, because it is built for the opposite purpose. The data never leaves the device by default, there is no admin console, and there is no way for a manager to view a team's activity. The project describes itself as a privacy-first alternative to RescueTime, ManicTime and WakaTime.
Starting price
Free
Pricing model
Free and open source (MPL-2.0); optional donations
Deployment
Self-hosted
Supported platforms
Windows, macOS, Linux
Trial status
Trial not listed
Best for
ActivityWatch suits individuals, freelancers and developers on Windows, macOS, Linux or Android who want automatic records of their own computer use, and teams that let each member track privately for self-review or to fill in timesheets elsewhere.
Why teams shortlist it
Its difference from every other tool in this category is that data is local-first: ActivityWatch stores activity on the device and does not send it to a server. Combined with an open license and a REST API, that makes it the tool for people who want tracking data they fully own and can query.
Kimai is the cheapest credible timesheet system I know of: free if someone on your team can run a PHP app, and €2.99 per user on Kimai Cloud if nobody can.
Starting price
Free
Pricing model
Free self-hosted (AGPL); Kimai Cloud per user per month
Deployment
Self-hosted
Supported platforms
Web
Trial status
Trial not listed
Best for
Kimai suits agencies, consultancies, software shops and NGOs of roughly 5 to 200 people that bill or report hours by customer and project and want to own their time data.
Why teams shortlist it
Kimai stands out as one of the few time trackers you can run entirely on your own server under an open-source license, with no user limit and no license fee.
TimeTrex suits SMB and mid-market operations teams that want time and attendance tracking on a free, self-hosted Community edition, with the paid Professional, Corporate or Enterprise tiers available as a cloud or on-site fallback if self-hosting becomes a burden.
Starting price
Free
Pricing model
Free open-source community edition, plus custom-priced Professional, Corporate and Enterprise tiers
Deployment
Cloud
Supported platforms
Web, iOS, Android
Trial status
Free trial available
Best for
TimeTrex is best for operations and people teams at SMB and mid-market companies that want structured time tracking, attendance, and workforce visibility while keeping control of where their data lives.
Why teams shortlist it
TimeTrex stands out because its free community edition includes biometric facial recognition timeclocks and customizable reports, features that many paid time-tracking tools charge extra for.
OrangeHRM is the pick for SMB and mid-market HR teams that want a free, GPL-licensed HRMS they can host and modify, with the per-employee Advanced edition available when they need more modules or vendor support.
Starting price
Free
Pricing model
Free open-source Starter edition; Advanced priced per employee per month on a custom quote
Deployment
Cloud
Supported platforms
Web
Trial status
Free trial available
Best for
OrangeHRM suits HR managers at small and mid-size companies, including healthcare, manufacturing and education employers, who want a full HRMS with employee records, leave, time and recruiting under their own control rather than inside a closed cloud product.
Why teams shortlist it
Few HR suites match OrangeHRM on this point: the core product is open source under the GNU GPL and the paid edition can still be installed on your own servers.
Sentrifugo is a free, self-hosted HR option for small and mid-sized teams that would rather run their own infrastructure than pay a per-user subscription, provided they have the engineering capacity to maintain it.
Starting price
Free
Pricing model
Free / open source (self-hosted, GPL-3.0); no commercial plan or price published
Deployment
Self-hosted
Supported platforms
Web
Trial status
Trial not listed
Best for
Sentrifugo is best for small and mid-sized teams that want a free, self-hosted way to track time, activity, attendance, and workforce visibility while keeping people data inside infrastructure they control.
Why teams shortlist it
Sentrifugo stands out because it pairs open-source flexibility with a self-hosted deployment model at no license cost — a combination that is uncommon among hosted workforce visibility tools.
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