Free Tools

RSC Clock: A Browser Toolbar Clock Extension With Digital & Analog Views

RSC Clock is the free Browser Toolbar Clock Extension I built for the exact moment you look up from a deep-work tab and have no idea what time it is — or worse, no idea what time it is for the client three zones away. No more opening a new tab, no more mental math on "their time is my time minus five." Click the icon once and see your local time plus up to two other zones, in a digital or fully-numbered analog view, styled with your own colors and fonts. One permission, nothing else — it runs entirely in your browser, syncs your settings through your browser's own account, and never phones home. No sign-up, no server, no tracking, no alarms or notifications competing for your attention.

Add to Chrome — Free Add to Firefox — Free

Also works on Edge, Brave, Opera & Vivaldi. Source available for review on GitHub — see how to install below.

RSC Clock — Browser Toolbar Clock Extension popup in light theme, showing the digital view RSC Clock — Browser Toolbar Clock Extension popup in dark theme with custom purple accent colors

This is the real RSC Clock icon — look for it on GitHub and on the Chrome/Firefox store listings to confirm you've got the genuine extension, not an impostor.

  • One Permission, Total Privacy RSC Clock asks for just storage — no tracking, no external server.
  • Every Chromium Browser & Firefox One extension — Chrome, Edge, Brave, Opera, Vivaldi, plus Firefox on its own listing.
  • Local Time + 2 World Clocks See your time zone and two others, side by side.
  • Free, Forever No trial, no premium tier, no ads — ever.

How to Install RSC Clock

One click from the official store for your browser, confirm the single permission it asks for, and you're done — no restart, no config file, nothing else to set up. Updates install themselves automatically from then on, so it just keeps working.

Chrome, Edge, Brave, Opera & Vivaldi

  1. STEP 01

    Click "Add to Chrome"

    Opens RSC Clock's official Chrome Web Store listing in a new tab — works the same on Edge, Brave, Opera, and Vivaldi too.

  2. STEP 02

    Click "Add extension"

    Chrome shows you the one permission it asks for — storage — before anything installs. Confirm it.

  3. STEP 03

    Pin it to your toolbar

    Click the puzzle-piece icon in your toolbar, then the pin next to RSC Clock, so it's always one click away.

  4. STEP 04

    You're set

    The RSC Clock icon appears in your toolbar immediately — click it any time to check the time.

Add to Chrome — Free

Firefox

  1. STEP 01

    Click "Add to Firefox"

    Opens RSC Clock's official Firefox Add-ons (AMO) listing in a new tab.

  2. STEP 02

    Click "Add"

    Firefox shows you the one permission it asks for — storage — before anything installs. Confirm it.

  3. STEP 03

    Pin it to your toolbar

    Click the extensions (puzzle-piece) icon, then the pin next to RSC Clock, so it's always visible.

  4. STEP 04

    You're set

    The RSC Clock icon appears in your toolbar immediately, and it stays there — no re-installing after a restart.

Add to Firefox — Free

Everything a Toolbar Clock Should Have Done From the Start

Most toolbar clocks stop at "shows the time," then bury it behind extra clicks or pile on alarms and stopwatches you never asked for. RSC Clock is built to be quiet by design — styled the way you'd actually want to glance at it dozens of times a day, and it never asks for more access than the one thing it needs to remember your settings.

  • Digital & Analog Views

    Switch between a clean digital readout and a fully-numbered analog face — all 12 numbers shown, not just dots or minimalist markers.

  • World Clock, 2 Extra Zones

    Add two more timezone slots alongside your local time — built for anyone coordinating calls or deadlines across time zones.

  • 12/24-Hour & Seconds Toggle

    Switch between 12-hour (with AM/PM) and 24-hour format, and turn the seconds display on or off, independently.

  • Light, Dark, or Auto Theme

    Pick a theme, or set it to Auto and let it follow your system's own light/dark preference automatically.

  • Custom Colors

    Quick-pick swatches for both the background and the clock face itself — make it match your browser, not fight it.

  • Custom Fonts

    Roboto Mono, Orbitron, Share Tech Mono, or your system default — pick whichever reads best to you at a glance.

  • No Tracking, No Account

    RSC Clock asks for exactly one permission — storage — and nothing else. No analytics, no external server, no sign-up.

  • Settings Sync, Built In

    RSC Clock's settings sync through the browser's own storage.sync — no account of mine required, no data ever touches my servers.

Digital for a quick glance, analog when you want it to actually look like a clock on your wall, not a widget.

RSC Clock — Browser Toolbar Clock Extension digital view showing local time and two world clock time zones
RSC Clock, digital view — local time plus two world clock slots.
RSC Clock — Browser Toolbar Clock Extension analog clock view with fully numbered clock faces, all 12 numbers shown
RSC Clock, analog view — every clock face fully numbered, not just dots.
RSC Clock — Browser Toolbar Clock Extension settings panel open, showing theme, color, and font customization options
RSC Clock's settings panel — theme, colors, fonts, and format, all in one place.

Frequently Asked Questions About RSC Clock

The questions people actually ask before installing a Browser Toolbar Clock Extension — permissions, privacy, and which browsers it supports.

Is RSC Clock really free?
Yes, completely — no trial, no premium tier, no ads. I built this Browser Toolbar Clock Extension because I wanted a clean toolbar clock myself and every option I found was either bare-bones or asked for permissions it had no business needing.
What permissions does RSC Clock need, and why?
Exactly one: storage. That's it — used only to remember your settings (theme, timezones, format) locally and sync them through your browser's own account, the same mechanism your bookmarks sync through. No tracking, no analytics script, no external server call, ever.
Is my data or settings sent to your servers?
No. There's no server involved at all. RSC Clock's settings live in the browser's built-in storage.sync — the same private, Google/Mozilla-run sync every extension with this permission uses. I never see it, store it, or have access to it.
Can I install RSC Clock without using the Chrome Web Store or Firefox Add-ons?
Yes — the source and a packaged zip for both browsers are on GitHub, for anyone who prefers a manual install or wants to review the code first. The store listing is still the recommended path for most people: it handles updates automatically, which a manual zip install doesn't.
Which browsers does RSC Clock work on?
Chrome, Edge, Brave, Opera, and Vivaldi all install the same package from the Chrome Web Store listing (anything built on Chromium works the same way). Firefox has its own listing on Firefox Add-ons (AMO).
Do I need to create an account to use RSC Clock?
No account, ever. Your settings sync through your browser's own built-in account (the same one your bookmarks already sync through) — RSC Clock never asks you to sign up for anything of its own.
Can I use more than two extra timezones?
Not yet — v1.0.0 ships with your local time plus two world clock slots, which covers the vast majority of "I work with people in two other time zones" cases without cluttering a small toolbar popup. More slots is on the list if there's real demand for it.
Is RSC Clock open source?
The source is public on GitHub for review and reference, so you can see exactly what it does before installing it. It isn't open for reuse or redistribution under its current license — see the repository for details.

Sponsorship Opportunities

I offer sponsorship spots on this tool page for brands looking to reach a highly targeted audience. I provide multiple sponsorship tiers, each offering a specific active duration before expiration. To maintain strict business ethics, all link placements are sequenced purely on a first-come, first-served basis. No tier upgrade or funding amount can bypass the line or alter your sequence. If you want to feature your brand here, please click the Sponsorship button in the footer to start the discussion and secure your placement.

Diamond Sponsors

This is the organization backing this tool at the highest level — their top-tier commitment is what keeps RSC Clock free and actively maintained. I've used and vetted what they've built, and I recommend exploring their platform.

Diamond

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Gold Sponsors

Gold sponsors play a critical role in keeping this tool fast and accessible. Their support directly funds continuous technical improvements. Take a look at what they're building right now.

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Who RSC Clock Is Built For

Anyone who glances at the corner of their browser a dozen times a day and gets nothing useful back for it.

  • Remote & Distributed Teams

    Stop losing track of time mid-task and showing up to standup a minute after everyone else already started.

  • Freelancers With Overseas Clients

    No more mental math before you hit send — know exactly when it's a reasonable hour to message a client three zones away.

  • Support & Ops Teams

    Track a shift-handoff or SLA window against a second timezone at a glance, not by counting on your fingers.

  • Anyone Who Just Wants a Clock

    No calendar app, no bloated dashboard widget, no alarms you didn't ask for — just the time, styled how you like it.