Website Uptime Monitoring App
That Actually Alerts You

Most uptime monitoring tools expect you to check a dashboard. Downtime doesn’t wait for you to log in. Domain Monitor is a mobile-first uptime monitoring app for iOS and Android that alerts you instantly when your website goes down — so you fix it before your users notice.

Download for iOS Download for Android
Free to start 21-day Pro trial iOS & Android

The basics

What is a website uptime monitoring app?

A website uptime monitoring app checks your website, server, or domain at regular intervals and alerts you when something goes wrong — before your users do.

Instead of manually loading your site and hoping it works, uptime monitoring runs in the background and notifies you the moment it detects a problem:

Website goes offline
Your server stops responding, or DNS fails to resolve — you get an immediate push notification.
Latency spikes
Response time suddenly jumps — often the first sign of an overloaded or degraded server.
SSL certificate expiring
Warns you 60, 30, 14, 7, 3, and 1 day before expiry — so a lapsed cert never kills your site.
TCP port unreachable
A database port, mail server, or custom service stops accepting connections — caught immediately.

The problem

Why most uptime monitoring tools fail you

Most monitoring tools are built as web dashboards. That means they assume you’re sitting at a computer, logged in, actively checking a screen.

But downtime doesn’t wait for you to log in.

The typical dashboard workflow
  • Open browser → navigate to your monitoring tool
  • Log in → wait for dashboard to load
  • Look for anything red → maybe notice something
That’s reactive. By the time you check, your users already saw the downtime.

A mobile-first uptime monitoring app flips this completely. The alerts come to you — push notifications directly on your phone, the moment something breaks.

The solution

What makes Domain Monitor different

Domain Monitor is built phone-first. Instead of asking you to check a dashboard, it monitors your targets automatically and alerts you when something needs your attention.

Instant push & email alerts
Get notified the moment your site goes down, recovers, latency spikes, or SSL expiry approaches. Push notifications on your phone — email alerts on Pro.
SSL certificate tracking
See days remaining for every cert. Milestone alerts at 60, 30, 14, 7, 3, and 1 day. Pro shows full certificate details — issuer, SANs, validity dates.
Latency history & trends
Track response time over time with a 24-hour sparkline. See min, avg, and max — and get alerted when performance degrades before users feel it.
HTTP & TCP port monitoring
Monitor websites with HTTP status checks — catch unexpected responses including 4xx errors, 5xx failures, and redirect chains. Or go lower-level with raw TCP port checks for databases, mail servers, and custom services.
On-demand traceroute
Run a traceroute from your phone to pinpoint exactly where in the network a connection breaks down. Diagnose issues without a terminal.
Public status page
Share a live status URL with your users or team. Automatically updated from your cloud checks — no extra setup. Pro feature.

Who it’s for

Built for people who own what they build

Domain Monitor is for anyone who’s responsible for something on the internet — and doesn’t want to find out it’s broken from a customer.

Freelancers
Managing multiple client sites? Get one app that watches all of them and pings you the moment something goes wrong — even on weekends.
Indie developers
Running a SaaS or side project? Monitor your API endpoints, databases, and web app — with latency trends so you catch performance regressions early.
Small businesses
Your website is your storefront. Know immediately when it’s unreachable — not an hour later when a customer calls to ask why they can’t check out.
Network admins on the go
Run manual checks from your phone with full diagnostic detail — latency, HTTP status, SSL info, traceroute — without SSH or a laptop.

Plans

Start free. Go Pro when you need it.

No credit card required. Download the app and add your first target in under a minute. New accounts get a 21-day Pro trial automatically — no payment needed.

No Account

Free

On-device only · no sign-in needed

  • ✓ 1 target
  • ✓ Manual checks from your device
  • ✓ Home screen widget (Android)

Registered

Free

Free account · synced across devices

  • ✓ Up to 5 targets
  • ✓ Synced across devices
  • ✓ TCP port monitoring
✦ PRO

Pro

$3.99/mo

or $39.99/yr · 7-day free trial · cancel anytime

  • ✓ Up to 12 targets
  • ✓ Cloud checks every 5 minutes
  • ✓ Push & email alerts
  • ✓ SSL certificate details
  • ✓ Latency history & trends
  • ✓ On-demand traceroute
  • ✓ Public status page
21-day free Pro trial — no card needed
Every new account automatically gets 21 days of Pro. Experience cloud monitoring, push alerts, SSL tracking, and more before deciding.
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FAQ

Common questions about uptime monitoring

Is there a free uptime monitoring app?
Yes. Domain Monitor is free to start — no account or credit card needed. You can add one target and run manual checks from your device immediately. Create a free account to monitor up to 5 targets, synced across devices. Pro ($3.99/mo) adds automatic cloud checks and push alerts, and every new account gets a 21-day Pro trial automatically.
Can I monitor my website uptime from my phone?
That's exactly what Domain Monitor is built for. It's a native uptime monitoring app for iOS and Android — not a web dashboard you have to log into. You can run a manual check from anywhere, and with Pro, our servers monitor your targets automatically every 5 minutes even when your phone is off.
How do I get alerts when my website goes down?
On Pro, Domain Monitor sends you a push notification the moment a target goes DOWN — and another when it recovers. You also get email alerts for downtime, recovery, latency spikes, and SSL expiry milestones. Cloud checks run every 5 minutes automatically, so you're notified within minutes of any issue.
Is there an uptime monitoring app for Android and iOS?
Yes — Domain Monitor is available on both Google Play (Android) and the App Store (iOS). The same account works on both platforms, so your targets sync across all your devices automatically once you sign in.
Can I monitor TCP ports, not just websites?
Yes. Add any host:port combination (e.g. db.myapp.com:5432) and Domain Monitor will check whether the port is accepting connections. This works for databases, mail servers, game servers, and any custom TCP service — not just HTTP or HTTPS endpoints.
What is SSL certificate monitoring?
Every HTTPS check also reads the SSL certificate on the target. Domain Monitor shows you how many days remain before expiry and sends alerts at 60, 30, 14, 7, 3, and 1 day before the certificate lapses — so a forgotten renewal never takes your site down. Pro users also get full certificate details: issuer, validity dates, and subject alternative names.
What's the difference between a local check and a cloud check?
A local check runs directly from your device — useful for instant on-demand diagnostics from wherever you are. A cloud check runs from our server every 5 minutes, continuously, even when your phone is off or out of signal. Cloud checks are what trigger push and email alerts. Cloud checks are a Pro feature.

Stop finding out from your users

Download the uptime monitoring app for iOS and Android

Free to start. 21-day Pro trial on signup. No credit card required.

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