Koncentro sits in an odd spot. It ships a Pomodoro timer, a task list, and a system-level website blocker inside one window, and each workspace carries its own timer settings, block rules, and tasks. That combination is genuinely rare, and the app is free and open-source. But it runs on one machine, has no mobile companion, and the blocker needs mitmproxy running under the hood. If any of that is a dealbreaker, this guide covers seven Koncentro alternatives for Windows, macOS, and Linux that solve the same context-switching problem from different angles.
We picked tools that either bundle focus and blocking like Koncentro does or lean hard on workspaces to keep a single project in one place. Prices, free-tier limits, and platform support were verified against the vendors’ own sites in August 2026.
Quick comparison
| App | Best for | Free plan | Starting price | Standout feature |
|---|---|---|---|---|
| Super Productivity | Direct open-source swap | Full app, no limits | Free forever | Issue-tracker sync (Jira, GitHub, GitLab) |
| Focus To-Do | Mobile sync on a budget | Timer + tasks, no sync | $9.99/yr or $11.99 lifetime | Cheapest cross-device pomodoro |
| Cold Turkey Blocker | Willpower-proof blocking | Website blocking | $39 one-time | Frozen Turkey full-computer lockdown |
| Rambox | Corralling 20 web apps | Basic workspaces | $7/mo Pro | Groups 100+ web apps in one window |
| SigmaOS | Mac browser tab overload | 3 workspaces | $10/mo | Focus mode with keyboard-first split view |
| Shift | Juggling multiple Gmail/Outlook accounts | Free with limits | $199.99/yr | Address-bar AI plus 1,500+ app integrations |
| Workona | Browser-only workflows | 5 workspaces | $8/mo | Workspace with tabs, docs, notes, tasks in one place |
Why people leave Koncentro
Koncentro is free and does a real job, so the reasons people switch are structural, not price.
No cloud sync or mobile app
Koncentro is a single-device desktop app. Your tasks, timer streaks, and block rules live on the machine you installed it on. Users on GitHub and Reddit repeatedly ask for sync or an Android build, and the maintainer has said both are out of scope for now. If you work on a laptop and a desktop, you rebuild your setup twice.
The blocker relies on a local proxy
Koncentro’s site blocker works by running mitmproxy locally and intercepting web traffic system-wide, which is why it blocks in every browser at once. That is powerful, but it also means installing a certificate, granting network permissions, and troubleshooting when a VPN or corporate proxy fights back. Cold Turkey Blocker and most competitors block at the DNS or hosts-file layer with less setup.
Thin ecosystem and integrations
There is no calendar view, no Jira or GitHub link-up, no shared workspace with a teammate, no browser extension for one-click site adds. For a solo user who lives in the app itself that is fine. For anyone whose tasks already sit in Linear, Asana, or a shared Notion page, doubling the entry is friction.
Young project, occasional rough edges
Koncentro is developed by one person (Bishwa Saha, @kun-codes) and reached its first stable release in 2024. Release cadence is healthy but bug reports on GitHub cover things like tray icon glitches on Linux and edge cases in the timer state after sleep. That is normal for a young project, and worth knowing before you commit.
Only blocks websites, not native apps
If Slack, Discord, or a native game is your real distraction, Koncentro will not stop you from opening it. The blocker targets HTTP(S) traffic. Cold Turkey Blocker and a handful of others can freeze applications too.
The 7 alternatives
Super Productivity, best for a direct open-source swap
Super Productivity is the closest thing to a “Koncentro plus” that we found. It combines a task list, projects, a Pomodoro timer, deadlines, and time tracking, and it plugs directly into Jira, GitHub, GitLab, Gitea, OpenProject, Redmine, and Caldav so your open tasks stream in from wherever you already track them. Version 18, shipped in March 2026, added rule-based automations, onboarding presets, and better mobile sync.
Where it falls short: No built-in website blocker. If Koncentro’s blocker is the piece you value most, you will need to pair Super Productivity with something like Cold Turkey Blocker or LeechBlock.
Pricing:
- Free: everything, no accounts, no premium tier, no feature gates
- Paid: none, the project is donation-funded
- vs Koncentro: same price (free), broader features, no blocker
Migrating from Koncentro: No importer, but Koncentro has no export you would need to bring over beyond your task list. Recreating a couple of projects and Pomodoro presets takes about ten minutes.
Download: Windows / macOS / Linux / Android / iOS / Web
Bottom line: Pick Super Productivity if you want Koncentro’s open-source ethos with more depth and integrations, and you can live without the blocker.
Focus To-Do, best cheap cross-device Pomodoro
Focus To-Do does the timer-plus-tasks half of Koncentro on every platform you own: Windows, macOS, Linux, iOS, Android, Apple Watch, Chrome extension. The free tier is generous for single-device use, and cross-device sync unlocks at $1.99 per month, $9.99 per year, or $11.99 for a lifetime license, which is the cheapest lifetime deal in this space.
Where it falls short: No website or app blocker at all, and the UI feels dated next to Super Productivity. Sync is proprietary, not open standards.
Pricing:
- Free: full Pomodoro timer, unlimited tasks on one device, basic reports
- Paid: $1.99/mo, $9.99/yr, or $11.99 lifetime for sync, white noise, deeper stats, custom themes
- vs Koncentro: same free desktop story, adds mobile and sync for pocket change
Migrating from Koncentro: No importer. Rebuild your project list once; the app is simple enough that this is a five-minute job.
Download: Windows / macOS / iOS / Android / Web
Bottom line: Pick Focus To-Do if the piece of Koncentro you actually use is the timer and task list, and you want it on your phone for $12 forever.
Cold Turkey Blocker, best for willpower-proof blocking
Cold Turkey Blocker is the strongest distraction blocker on Windows and macOS. It blocks websites, native applications, and even the entire computer. The Frozen Turkey mode locks you out for a set window with no override, no restart trick, no reinstall workaround, which is why it shows up in every serious review of focus tools since 2017.
Where it falls short: No task list, no notes, no pomodoro in the free tier (Pro adds scheduled focus blocks that behave like pomodoro rounds). It is a blocker first and a productivity suite second.
Pricing:
- Free: unlimited website blocking with basic schedules
- Paid: $39 one-time for Pro, which adds application blocking, Frozen Turkey, and scheduled sessions
- vs Koncentro: pricier upfront but pays once, and the blocker is meaningfully stronger
Migrating from Koncentro: Copy your block list from Koncentro’s workspace settings into a Cold Turkey block list. There is no direct importer, but a mid-size list takes five minutes.
Download: Windows / macOS
Bottom line: Pick Cold Turkey Blocker if your problem is that you always find a way around your own blocks. Pair it with Super Productivity or Focus To-Do for tasks.
Rambox, best for corralling web apps into workspaces
Rambox takes the workspace idea in a different direction. Instead of grouping tasks and a timer, it groups the actual web apps you use, Slack, WhatsApp, Gmail, Notion, Trello, Asana, ClickUp, and 100 others, into named workspaces you can flip between. When you switch from “Client A” to “personal”, every relevant app switches with you.
Where it falls short: Rambox is Chromium under the hood, so RAM use climbs with each active app. There is no Pomodoro, no task list of its own, and no blocker.
Pricing:
- Free (Basic): unlimited apps, basic workspaces, limited themes and integrations
- Paid: $7/mo Pro ($5.83/mo billed annually), $14/user/mo Enterprise
- vs Koncentro: solves a different half of the problem, at a subscription price
Migrating from Koncentro: Not applicable, the two do different things. Many users run both, Koncentro for focus, Rambox for the app sprawl.
Download: Windows / macOS / Linux
Bottom line: Pick Rambox if the real reason you context-switch is that you have twelve web apps open in twelve tabs.
SigmaOS, best for Mac users who live in the browser
SigmaOS is a Mac-only browser built around workspaces. Each workspace holds its own tabs, split-screen layout, and snooze rules, and the focus mode strips every toolbar so only the current tab is visible. It is the closest browser-native equivalent to what Koncentro does at the app level.
Where it falls short: macOS only. The free plan caps you at three workspaces, which is tight if you actually use the feature.
Pricing:
- Free: 3 workspaces, split view, built-in ad blocker
- Paid: $10/mo or $96/yr Pro (unlimited workspaces, cross-device sync), $15/mo per user Teams, students and educators get 50% off
- vs Koncentro: pricier and Mac-only, but the workspace model runs in the browser where the distraction lives
Migrating from Koncentro: Not applicable. Import bookmarks from your current browser; SigmaOS handles Chrome, Firefox, and Safari imports natively.
Download: macOS
Bottom line: Pick SigmaOS if you are on a Mac, most of your day is in the browser, and $10 a month buys back the hours you lose to tab overload.
Shift, best for juggling multiple accounts and heavy web-app stacks
Shift looks like Rambox at first glance but leans harder on multi-account workflows. Connect every Gmail, Outlook, and Microsoft 365 account you have and switch between them without logging in and out. It wraps Notion, Trello, Asana, Slack, and 1,500 other web apps into named Spaces, and since April 2026 the address bar has a built-in AI that answers questions across your Spaces.
Where it falls short: The Advanced plan is $199.99 per year, which is real money. Linux is not supported.
Pricing:
- Free: 2 accounts, 1 workspace, basic search
- Paid: $149.99/yr Basic, $199.99/yr Advanced (unlimited accounts + AI), $99.99/user/yr Teams
- vs Koncentro: expensive by comparison, but a genuine productivity gain if you have four inboxes to manage
Migrating from Koncentro: Not applicable. Sign in to each app the first time; Shift saves the sessions and pins them into a Space.
Download: Windows / macOS
Bottom line: Pick Shift if you run a consultancy, a side project, and a day job out of the same laptop and the account switching is the actual pain.
Workona, best if your work already lives in the browser
Workona is a browser extension for Chrome, Firefox, and Edge that turns your tabs into project-based workspaces. Each workspace stores tabs, docs, notes, tasks, and links, and the whole thing autosaves and syncs across devices. It is the lightest-touch option in this list because it does not install a desktop app.
Where it falls short: Browser only, so it does nothing for native apps. The free plan capped workspaces at 5 in late 2024, down from 10, which frustrated long-time users.
Pricing:
- Free: 5 workspaces, core tab and workspace management, sync
- Paid: $8/mo Pro ($96/yr) for unlimited workspaces and integrations with Google Drive, Slack, Asana
- vs Koncentro: no focus timer or blocker, but the workspace organization is stronger for browser-heavy workflows
Migrating from Koncentro: Not applicable. Save your current open tabs into named workspaces on first install; that takes a couple of minutes per project.
Download: Web / Chrome / Firefox / Edge
Bottom line: Pick Workona if 90% of your work happens in a browser tab and you never open a native app for anything but Zoom.
How to choose
The honest answer depends on which piece of Koncentro you actually use most.
If you love the whole bundle and just want more polish, Super Productivity is the closest match, still open-source, and still free.
If you sync between a laptop, a desktop, and a phone, Focus To-Do at $11.99 lifetime is the cheapest way to keep the timer and task list wherever you are.
If Koncentro’s blocker is the load-bearing feature and you keep sneaking past it, Cold Turkey Blocker is the nuclear option. Pair it with any task manager you already trust.
If the real problem is not focus but too many web apps open at once, Rambox or Shift solve that head-on. Pick Rambox for a free start on Linux, Shift if you are on Mac or Windows and want polished multi-account support.
If you are a Mac user who lives in the browser, SigmaOS replaces both your browser and your workspace tool. If you are on Chrome across platforms, Workona does the same job as an extension for less money.
Stay on Koncentro if you value the exact combo (timer plus tasks plus system-wide blocker) on a single machine, and you would rather use free open-source software than pay a subscription. It is the only tool in this list that ships all three in one window.
FAQ
Is Koncentro really free?
Yes. Koncentro is free and open-source under the GPL-3.0 license, with no paid tier. You can install it from the GitHub releases page for Windows, macOS, and Linux.
What is the best free Koncentro alternative?
Super Productivity. It is free forever, open-source, cross-platform including mobile and web, and it integrates with the major issue trackers. The one thing it lacks compared to Koncentro is a built-in website blocker.
Does Super Productivity have a Pomodoro timer like Koncentro?
Yes. Super Productivity includes a configurable Pomodoro timer tied to your tasks, so every session logs time against the thing you were working on. Version 18 also added deadlines and rule-based automations.
Can I use Koncentro on my phone?
No. Koncentro is desktop-only for Windows, macOS, and Linux, and the maintainer has not committed to a mobile build. If mobile sync matters, Focus To-Do and Super Productivity both offer Android and iOS apps.
What is the best Koncentro alternative for blocking websites?
Cold Turkey Blocker on Windows and macOS. It blocks at the system level, blocks native applications in the Pro tier, and its Frozen Turkey mode is the strongest lockdown mode in this category. There is no equivalent on Linux with the same polish, though open-source options like LeechBlock (browser only) come close.
Do any of these tools import my Koncentro data?
No. Koncentro stores tasks locally and none of these alternatives offer a Koncentro importer. The good news is that Koncentro projects are small enough (task lists and block lists, not databases) that rebuilding one manually takes minutes, not hours.
