Can a Chrome extension block Slack, Teams, or email at work?

Only the browser versions. A Chrome extension can block mail.google.com, slack.com, or teams.microsoft.com in a tab, but it can't touch the Slack, Teams, or Outlook desktop apps, because those run outside the browser. If your real work distraction is the desktop Slack app pinging you every few minutes, an extension won't help — you need OS-level blocking from a desktop tool like the Focuh Mac app, which can block applications during a focus session.

Should I block websites during the whole workday or just in focus sprints?

Sprints work better for most jobs. Blocking everything from nine to five sounds disciplined but tends to break the first time you legitimately need a blocked site for research, and once you disable the block it rarely goes back on. Time-boxed blocking — block hard for a 50- or 90-minute focus sprint, then open up — keeps the block credible because it has a clear end. Focuh's challenge model and Pomodoro extensions like Strict Workflow both fit this rhythm.

Are free Chrome work blockers good enough, or do I need a paid one?

Free is enough for the core job of blocking distracting sites during work. Focuh, LeechBlock NG, and Strict Workflow are all free and handle blocking, scheduling, or Pomodoro structure without a subscription. You're paying mainly for cross-device sync, password locks, and team features — useful for some, unnecessary for a solo worker who just wants Reddit and YouTube gone during deep work. Start free; only pay if you hit a specific wall.

Will a work blocker slow down my browser or leak my browsing to my employer?

A lightweight blocker won't slow Chrome down — it just checks the current hostname against a local list, which is negligible work. Privacy depends on the extension: local blockers like Focuh and LeechBlock NG don't send your browsing anywhere, while some freemium blockers sync to a server. Note that a personal extension you install yourself doesn't report to your employer, but a blocker pushed by company device management is a different thing and may be visible to IT.

How many sites should I block for work?

Block the handful you actually lose time to, not an exhaustive list. For most people that's the social feeds (X, Instagram, LinkedIn, Reddit), video (YouTube, Twitch), news, and shopping. Five to fifteen domains covers the real damage. This is exactly where a three-site free cap becomes a problem, since a serious work blocklist blows past three by mid-morning. An uncapped free blocker like Focuh or LeechBlock NG avoids that ceiling entirely.

Can I block websites for work but still allow them on breaks?

Yes, two ways. A Pomodoro blocker like Strict Workflow blocks during the work interval and automatically opens up during the break, so breaks are built in. Or use a session-based blocker like Focuh: start a focus block when you sit down, end it when you take a real break. Avoid all-day blocks if you want break access — they make the block feel like a punishment, which is when people rip it out and don't reinstall it.

Chrome extensionwebsite blockerworkproductivityfocus

Best Chrome Extension to Block Websites for Work (2026)

Q: What's the best Chrome extension to block websites for work in 2026?

For most people it's Focuh, because it's genuinely free, needs no account, and doesn't cap how many sites you block — which matters when your distraction list runs to a dozen domains. LeechBlock NG is the better pick if you want hour-by-hour work schedules and don't mind a dense settings page. Strict Workflow suits people who already work in Pomodoro intervals. BlockSite is polished but caps its free tier at three sites, so it stops being free fast for a real work blocklist.

Q: What blocks work distractions across every browser, not just Chrome?

No Chrome extension can, by definition — it only controls Chrome. If you switch to Safari or Firefox to reach a blocked site, the extension is gone. For coverage across every browser plus desktop apps, you need OS-level blocking. The free Focuh Mac app blocks at the macOS level during a focus session, so the block holds whether you're in Chrome, Safari, Firefox, or a native app. Many people pair the free extension with the free Mac app.

June 19, 202610 min readFocuh

The best Chrome extension to block websites for work in 2026 is the one you'll actually keep on during a deep-work block — which usually means free, no account, and no three-site cap that you blow past before lunch. For most people that's Focuh; for schedule obsessives it's LeechBlock NG; for Pomodoro people it's Strict Workflow. This guide compares the real options on the things that matter at work: how they block, what they cost, and where each one quietly fails.

A work blocker has a different job than a study or "digital detox" blocker. You need a blocked site to be blocked when you're heads-down, but you also genuinely need some of those sites during the day — LinkedIn for a client, YouTube for a tutorial, Twitter for a support handle. So the question isn't just "what blocks the hardest." It's "what blocks hard during focus and gets out of the way the rest of the time."

The best Chrome extensions to block websites for work, compared

Extension	Free	Site cap	Best blocking model for work	Account
Focuh	Yes	Unlimited	Session/challenge blocks for deep work	None
LeechBlock NG	Yes	Unlimited	Hour-by-hour schedules per blockset	None
Strict Workflow	Yes	Unlimited	Pomodoro: block during work interval	None
StayFocusd	Yes	Unlimited	Daily time budget on time-wasters	None
BlockSite	No (3-site free cap)	3 free	Scheduling behind a paywall	Required

The column that decides most of this is the site cap. A serious work blocklist — the feeds, video, news, shopping — runs to a dozen domains easily. A blocker that lets you block three for free isn't a free work blocker; it's a demo. That alone moves BlockSite down the list for this use case, however polished it is otherwise.

Focuh — best free pick for deep-work blocks

Focuh is a free Chrome extension built around blocking distractions for a set focus period rather than nagging you with a daily allowance. You add your work-distraction domains — no limit on how many — and run a challenge while you work. There's no account, no telemetry, and no paid tier, so the whole blocklist works for free.

For work, the strength is simplicity under pressure. You're not configuring schedules at 9am when you should be working; you start a block, the distracting sites redirect to a quiet page, and the attempt counter shows you how often the reflex fired. When you take a real break, you control when the block lifts.

The honest limit is the one every extension shares: it blocks Chrome and only Chrome. If your work distraction is the desktop Slack app or you'll hop to Safari to reach a blocked site, the extension alone won't hold. That's what the free Focuh Mac app is for — OS-level blocking across browsers and apps, covered below.

Try Focuh for work

LeechBlock NG — best for hour-by-hour work schedules

If your ideal is "block social media 9–12 and 1–5 on weekdays, open on weekends," LeechBlock NG is the tool. It's free, open-source, and gives you up to 30 independent blocksets, each with its own list, schedule, and time limit. You can block by domain, URL pattern, or keyword, and require a delay or password before a block can be lifted — useful friction during work hours.

The cost is setup time. LeechBlock's options page is dense, and getting your work schedule dialed in takes a focused 15 minutes. Worth it if you want a precise weekly blocking calendar; overkill if you just want to block five sites and start working.

Strict Workflow — best for Pomodoro workers

Strict Workflow pairs a 25/5 Pomodoro timer with a blocklist: blocked sites are blocked while the work timer runs and open during the break. If you already structure your day in Pomodoros, blocking comes for free with the rhythm you're already using, and breaks are built in so the block never feels like a cage. It's free with no account.

It's single-purpose, though — no long sessions, no analytics, no scheduling beyond the timer. For Pomodoro-native workers that's the appeal; for anyone wanting longer deep-work blocks, Focuh or LeechBlock fit better. For the wider trade-offs between methods, see timeboxing vs Pomodoro vs time blocking.

StayFocusd — the daily-budget option

StayFocusd uses a daily time budget: give yourself, say, 20 minutes total on time-wasters, and once it's spent, those sites lock for the rest of the day. For work, this suits people who want some access without going down a hole. It's free with no account. Two caveats: it's effectively unmaintained, and it's owned by Sensor Tower, an ad-intelligence company — worth weighing if you care who builds your tools. The best free website blocker for Chrome roundup digs into that ownership question.

The limit every Chrome work blocker shares

Here's what no extension can do, and it matters more at work than anywhere else: a Chrome extension blocks Chrome, full stop. It can't block the Slack desktop app, the Outlook app, the Spotify app, or a blocked site you reopen in Safari. At work, your worst distractions are often not in a Chrome tab — they're the desktop apps pinging you, or the muscle-memory Cmd+Tab to another browser.

For blocking that holds across every browser and desktop apps, you need OS-level blocking. The free Focuh Mac app blocks at the macOS level during a focus session, so the block applies whether you're in Chrome, Safari, Firefox, or a native app. The reliable work setup is layered: the free extension for the browser, the free Mac app for everything else. The reasoning is laid out in system-level vs browser website blocking. If your work is studying-adjacent, the best Chrome extension to block websites for studying covers that angle too.

Which work blocker should you choose?

You want free, uncapped, dead-simple deep-work blocking — Focuh. Start a block, get to work, no account.
You want a precise weekly blocking schedule — LeechBlock NG, once you've spent 15 minutes configuring it.
You already work in Pomodoros — Strict Workflow, blocking built into the timer.
You want a daily allowance, not a hard block — StayFocusd, with the ownership caveat noted.
You also lose time to desktop apps or other browsers — add the free Focuh Mac app on top of any of the above.

No extension fixes focus by itself, and the "best" one is just the one you don't disable by 10am. Pick the model that matches how you work, keep the blocklist to the domains that actually cost you time, and put OS-level blocking behind it if your distractions live outside Chrome. Install Focuh free to start, and get the free Mac app when the browser layer isn't enough.