Walters Sentinel

Know your business is offline before your customers do.

  • Uptime, SSL, domain & DNS monitoring
  • Instant email alerts the moment something breaks
  • Public status pages your customers can trust
  • Every sign-in verified - your account, secured
Walters Sentinel

Every sign-in needs your password and a fresh emailed code.

  1. 1You
  2. 2Email
  3. 3Verify
  4. 4Password

Who is this account for?

It changes what we need from you, and nothing else. You can add a company later.

What's your email?

Every alert, every sign-in code and every receipt goes here, so it's worth typing carefully. That's why we ask twice.

Check your email

We've sent a six-digit code to your address. It expires in 10 minutes.

Wrong address? ·

Choose a password

Your email is verified.

Enter your account email and we'll send you a one-time reset link.

Code sent to your email

Enter your code

Check your inbox for a 6-digit code, or use the one-click link - either one signs you in.

You can open that link on your phone. This page will unlock by itself when you do.

One thing before you start

You need to agree to our Terms and Privacy Policy to use Walters Sentinel. This is a one-off - you will not be asked again.

Monitor only what you are allowed to. Adding a monitor for infrastructure you do not own or have permission to test is a breach of the Terms.
Nothing auto-renews, and payments are final. You are only ever charged for a period you chose to buy. We do not give refunds, including for unused time.
Some data is deleted on a schedule. Check history after 90 days, support email after 15 days. Your monitors and their current status are unaffected.

Your organizations

The organizations you can access are listed below.

Get started

Pick a plan to create your first organization

An organization holds your monitors, your team and its own subscription. Buying a plan creates one - you choose the name at checkout.

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Already been invited to one? Ask whoever runs it for the invite code, then .

Testing mode

Try any plan

Your address has tester access. Create an organization on any plan and it will behave exactly as a paid one - same monitor limits, same check intervals, same alerting. Nothing is charged.

What to check on each plan
  • Monitor limits - add monitors until it stops you, and confirm the message names the right number.
  • Check intervals - Starter and Business should not offer anything faster than 5 minutes; Enterprise should offer 1 and 2 minutes; MSP should offer 30 seconds.
  • Organization limits - Starter and Business allow one, Enterprise two, MSP unlimited.
  • Alerting - point a monitor at a broken address, set the failure threshold to 1, and confirm the email arrives and then the recovery email after you fix it.
  • Maintenance windows - Enterprise and above only.
  • The status page - open it signed out and confirm only the monitors marked public appear.

Create an organization

Join with a code

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You're on the Free plan

One website or API, checked every 5 minutes. Upgrade in Billing for more monitors, faster checks, DNS and email checks, and your team.

Public status page
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Add a monitor

Point it at an address and choose what to watch. Only the first section is required - everything else has a sensible default.

By default anything from 200 to 399 counts as working. Change that here if your site is unusual - an API that returns 401 without a key is healthy, not broken.

Check the page content

A status code alone cannot tell you the page is right. A site can return 200 while showing a database error, an empty template, or somebody else's parked domain.

Speed
Authentication

For anything behind a login. Credentials are encrypted before they are stored and are never shown again after you save.

Connection

Beyond "is it up". These run alongside the main check and catch the problems that arrive with warning - a certificate quietly expiring on a Sunday, a domain nobody renewed.

Alerts go to the organization's alert recipients, set under Settings.

Nothing is being watched yet

Add your first address and we'll start checking it. You'll hear from us when something breaks - and not before.

Is it up Checked as often as your plan allows, from outside your network, the way a customer would reach it.
Is it right A page can return "200 OK" while showing a database error. We can check the words on it too.
Is it fast Set a limit and we'll flag it as degraded before slow turns into down.
Will it break soon Certificates, domain renewals, DNS changes and email records - the failures that arrive with warning.

Not sure it's set up right? Fill the form in and use Test without saving - it sends a real request and tells you what came back.

Members

Everyone who can sign in and see this organization's monitors.

Owner Everything an admin can do, plus billing and deleting the organization. There is exactly one.
Admin Add and remove monitors, invite and remove members, change the name and logo, set maintenance windows.
Member See the monitors and their history. Cannot change anything or see billing.
Invite by email
We'll email them the code and a link to sign in. They join as a member.

Or share the code
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Anyone with this code can join, so treat it like a password. Regenerating stops the old one working immediately.

Roles & alert routing

Decide what each person can do, and which alerts reach them. Somebody on call does not need the billing emails, and whoever pays the invoices does not need waking at 3am.

My alert emails You are emailed about everything the roles you hold subscribe to.
What they can do
What they are emailed about

Everyone holding this role is emailed when one of these happens. They can silence it for themselves.

Clients

Each client gets their own isolated monitors and a white-labeled status page.

Current plan

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Change plan

Nothing renews automatically. You are never charged without choosing to be.

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Payment history

Every payment on this organization. Refunds are not issued - see the Terms.

Organization

The name and logo used across the dashboard, your public status page and every alert email.

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Logo optional
PNG, JPEG, WebP, GIF or SVG, up to 500KB. A square image looks best. We host it for you, so it keeps working even if your own site is the thing that goes down.
We'll load it from your server each time. If that address ever stops working, the logo disappears - uploading avoids that.

Saved

Delete this organization

This permanently removes the organization, its monitors and all their history. It cannot be undone, and no refund is given for any remaining time - see the Terms.

Alert recipients

Everyone here is emailed the moment a check fails. Add your on-call inbox, a shared team address, or anyone who needs to know.

Alert delivery

Who hears about a problem, when, and whose name is on the email.

Slack, Teams & webhooks

Business plan

Send alerts where your team already is. Email is still sent as well.

Quiet hours

Enterprise plan

Hold non-urgent warnings overnight - an expiring certificate can wait until morning. Outages always go straight through, at any hour. Held alerts still appear in the dashboard and the digest.

Escalation

Enterprise plan

If a monitor is still down after a set time, we email a second list. An alert nobody reads is worth nothing; the same alert to somebody else half an hour later is how an outage actually ends.

Email digests

Enterprise plan

A summary of every monitor, whether anything broke or not. The thing an alert email cannot give you: proof it was all fine this week.

Your name on the alerts

White-label / MSP plan

Alerts sign off as you, and replies reach you rather than us. Your clients need never know who runs the monitoring.

Saved

Scheduled maintenance

Pause alerting for a planned change. Checks keep running and history stays accurate - only the emails are held back.

Security

Two-factor authentication
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Which organization is this for?

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