Features

Automatic focus zones, website blocking, calendar-aware activation, and wall-clock timing — all local-first and privacy-respecting.

7+
Browsers
3
Platforms
0
Accounts needed
100%
Open source
Core

Automatic focus activation

Forca integrates with your calendar to detect when meetings end. When a meeting finishes, it automatically starts your configured focus zone — no buttons to press, no willpower required.

Google Calendar integrationOAuth-based, read-only access to your calendar events.
iCal URL supportWorks with Outlook, Apple Calendar, and any iCal-compatible service.
Configurable post-meeting delaySet a buffer between meeting end and zone start (0–30 minutes).
Manual start always availableStart any zone instantly from the home screen or tray.
Blocking

Website blocking

Define lists of websites to block during focus sessions. The browser extension enforces these rules in real time using the browser's native Declarative Net Request API — no performance overhead.

Per-zone site listsEach zone has its own set of blocked domains.
Domain-level blockingBlock entire domains (e.g., reddit.com) with a single entry.
Instant unblock on zone endDNR rules are removed the moment a zone ends or a break starts.
Works across all supported browsersOne zone blocks sites in every connected browser simultaneously.
Flexibility

Focus zones

Create multiple focus profiles for different types of work. Each zone has its own duration, blocked sites, and trigger rules. Switch between them effortlessly.

Unlimited zonesCreate as many as you need — deep work, email triage, side projects.
Custom durations (5–480 minutes)Short sprints or extended deep work sessions.
Per-zone blocked site listsBlock social media for deep work but keep Stack Overflow accessible.
Pause and resume supportPaused time is added back so your session stays accurate.
Timer

Wall-clock accurate timing

Forca uses wall-clock timing instead of tick-based counters. Your timer stays accurate even if your computer sleeps, suspends, or the process is throttled by the OS.

Sleep-safe timersClose your laptop, come back — the timer picks up exactly where it left off.
Pause adds time backPause for a call? That time is added to the end of your session.
Break remindersForca reminds you when a break ends so you can start your next zone.
Tray status at a glanceSee remaining time and zone status directly in the system tray.
Cross-browser

Browser support

Forca's browser extension works with Firefox (one-click install from Add-ons) and all major Chromium browsers via Developer Mode. The same blocking features work across every supported browser.

Firefox: Add-ons Store (1-click)Install directly from Mozilla — no Developer Mode needed.
Chrome, Edge, Brave, Arc, Vivaldi, OperaLoad unpacked via Developer Mode — persists across restarts.
Same blocking across all browsersOne zone blocks sites in every connected browser at once.
Setup guided by the desktop appThe onboarding wizard walks you through installation step by step.
Privacy

Local-first architecture

Your data never leaves your computer. Forca stores everything locally with no cloud dependency. No accounts, no tracking, no data collection. Open source so you can verify.

Zero cloud dependenciesAll settings, zones, and scores stored locally with electron-store.
No account requiredDownload, install, and start using immediately.
Open source (MIT)Full source code on GitHub — audit it yourself.
Optional syncFirebase sync available if you want multi-device support (optional).

How blocking works

Five steps from starting a zone to sites being blocked — all happening locally on your machine.

1

You start a zone

Click Start in the app, or let it auto-trigger after a meeting ends.

2

Desktop app broadcasts state

The Zone Engine sends the active zone, duration, and blocked site list over WebSocket (port 7432).

3

Extension installs blocking rules

The browser extension receives the state and installs DNR rules for each blocked domain.

4

Sites are blocked

Navigating to a blocked site shows the Forca blocked page. The timer counts down in the tray.

5

Zone ends, rules removed

When the timer completes (or you end the zone), DNR rules are removed and sites become accessible.

Why Forca

How Forca compares to manual site-blocking or basic timer apps.

FeatureForcaManual
Automatic activation after meetings
Calendar integration
Per-zone blocked site lists~
Wall-clock accurate timers
Pause and resume with time back
Multiple browser support~
System tray controls
Break reminders
No account required~
Open source~

Platform support

Desktop app and browser extension work across all major platforms.

Desktop App

Windows10+ (64-bit)
Recommended
macOSApple Silicon & Intel
Linuxx64 (AppImage)

Browser Extension

FirefoxAdd-ons Store
ChromeDeveloper Mode
EdgeDeveloper Mode
BraveDeveloper Mode
ArcDeveloper Mode
VivaldiDeveloper Mode
OperaDeveloper Mode

Privacy by design

No telemetryZero analytics, tracking, or data collection of any kind.
No cloud dependencyAll data stored locally with electron-store. Works fully offline.
No account requiredDownload, install, and start using immediately.
OAuth tokens strippedCalendar tokens are removed before any optional sync.
Open source (MIT)Full source code on GitHub — audit it yourself.
Local WebSocket onlyDesktop-to-extension communication stays on port 7432.
Download Forca free