1
Install the Extension
Add the AlertsDown extension to Chrome and pin it to your toolbar so the status badge is always visible.
Chrome Extension Downtime Alerts for Websites and APIs
Get a desktop notification in Chrome the moment your website or API goes down, recovers, or has an SSL certificate problem. The AlertsDown extension also keeps the live status of every monitor one click away in your toolbar, and it is included on every plan, Free Builders too.
Why Chrome for Downtime Alerts?
- Right where you work: alerts appear on the desktop you already have open
- Down, recovery, and SSL alerts: for HTTP, API, and MCP monitors
- Toolbar badge: a red count of monitors that are down right now
- Live status popup: every monitor and its current state, one click away
- No verification step: signing in connects the extension automatically
- Every plan: included on Free, Indie, Saas, and Founding Builders
How Chrome Extension Alerts Work
2
Sign In
Sign in with your AlertsDown email and password. The extension connects itself as your "Chrome extension" contact, with no code to enter.
3
Choose It on Your Monitors
Select "Chrome extension" as a contact on the monitors that should alert you, just like email, SMS, or Signal. Alerts start with the next incident.
What You Get in Chrome
When a monitor with the Chrome extension selected goes down, every Chrome browser signed in to the extension shows a desktop notification with the monitor name and URL. When the monitor recovers, the recovery notice replaces the down notice, so your screen reflects the current state instead of a pile of old alerts. SSL certificate problems raise their own notification.
Click a notification to open that monitor in your AlertsDown dashboard. The toolbar icon shows a red badge with the number of monitors that are down, and the popup lists every monitor with its status, plus shortcuts to open the dashboard or add a monitor.
Chrome Extension vs Other Alert Channels
| Channel | Where alerts arrive | Best for | Availability |
|---|---|---|---|
| Chrome extension | Desktop notification in every signed-in Chrome browser | Seeing outages while you work at your computer | Every plan, including Free Builders |
| Your inbox | Detailed records and low-urgency updates | Every plan | |
| Signal | Your phone, end-to-end encrypted | Private alerts when you are away from your desk | Every paid plan |
| SMS | Any phone, no data connection needed | A fallback that works without mobile data | Every paid plan |
Browser notifications only reach you while Chrome is running. Pair the extension with email, Signal, or SMS so a critical outage still reaches you when your laptop is closed.
Included on Every Plan
Free Builders
Chrome extension alerts are part of the free plan, alongside email. No credit card required to sign up and start receiving desktop notifications.
Paid Plans
Indie, Saas, and Founding Builders include the extension too, together with Signal, SMS, Telegram, webhooks, and more.
Monthly Allowance
Chrome extension alerts count toward your plan's monthly notification allowance, like any other channel. One alert covers every Chrome browser signed in to your account.
Private by Design
The extension stores only your session token, your account email, and your latest monitor statuses in Chrome's local storage on that device. Nothing is synced to other browsers. Your password is sent once to sign in and is never stored.
It does not read your browsing history or the content of the pages you visit, it has no analytics and no remote code, and it talks only to api.alertsdown.com. Signing out removes the stored token and monitor data. Read the details in the Chrome extension section of our privacy policy.
Related resources
Just getting started? Set up website monitoring first, then choose the Chrome extension on your monitors.
Want alerts on your phone as well? See Signal downtime alerts, Telegram downtime alerts, or WhatsApp downtime alerts.
Need a channel that works without mobile data? Compare with SMS downtime alerts as a fallback.
Watching endpoints for coding agents? The extension also alerts on MCP server monitors and API monitors.
Review plan limits and channel availability on the pricing page.
Get Downtime Alerts in Chrome
Install the extension, sign in with your AlertsDown account, and choose "Chrome extension" on your monitors. It works on every plan, including Free Builders.
Chrome Extension Alerts FAQ
How do I get downtime alerts in Chrome?
Install the AlertsDown extension, sign in with your AlertsDown account, then select "Chrome extension" as a contact on each monitor that should alert you. From then on, every Chrome browser signed in to the extension shows a desktop notification when that monitor goes down or recovers.
Is the Chrome extension available on the free plan?
Yes. Chrome extension alerts are included on every plan: Free Builders, Indie Builders, Saas Builders, and Founding Builders. Alerts count toward your plan's monthly notification allowance, like other channels.
Do I need to verify the Chrome extension contact?
No. Signing in to the extension connects your "Chrome extension" contact automatically, so there is no code to enter. To stop the channel entirely, delete the contact from My Contacts in your dashboard.
Which events trigger a Chrome notification?
The extension notifies you when a monitor goes down, when it recovers, and when an SSL certificate problem is detected. It works for HTTP, API, and MCP monitors. Clicking a notification opens the monitor in your AlertsDown dashboard.
Do I get alerts when Chrome is closed?
Desktop notifications need Chrome to be running. If you might be away from your computer during an outage, pair the extension with email, Signal, or SMS on the same monitor.
What data does the extension store?
Only a session token, your account email, and your latest monitor statuses, kept in Chrome's local storage on that device. The extension does not read your browsing history or page content, and it talks only to api.alertsdown.com.