Free
FreeForeverNo card
$0
forever, no credit card
- 5 monitored domains
- Daily SSL + reachability checks
- Expiry alerts at 30, 7, and 1 day
- Plain-text email from Otis
SSL certificate monitoring
Your cert
won't expire
on a Saturday.
Otterwatch checks your sites once a day and emails you when a certificate is about to expire — or when your site goes quiet. That's the whole product.
Free plan
No credit card
Plain-text email
From Otis
Hi — your certificate for apple.com expires in 7 days. Time to renew it.
— Otis at Otterwatch
Free tool
Just want to spot-check a site?
Paste a domain, see its cert. No signup, no tracking.
The dashboard
Everything you need on one page.
Each site shows its status, when its certificate expires, and when we last checked. That's the whole interface — no graphs, no tabs, no settings to fiddle with.
How it works
One quiet daily check.
01
Add a site
Paste the URL. That's it — no DNS or HTML changes needed.
02
We check daily
Once a day, Otis runs the two checks. No scheduling for you to set.
03
Email if something changes
Otherwise, silence. You won't hear from us if everything is fine.
What we watch
Two checks, done well.
We don't do synthetic transactions or 17-region uptime. We do the two things that actually wake you up at 4am.
SSL certificates
We read your cert each morning and email you at 23, 14, 7 and 1 days before it expires. If it's already expired, you'll hear about it within the hour.
Reachability
A daily HTTP check from a quiet box on the east coast. Anything other than 2xx counts as down. We re-check three times before we email you.
Plain-text email
No HTML, no tracking pixels, no marketing fluff. A note from Otis with what changed and a link to the dashboard — where you can stop alerts anytime.
Pricing
Free forever. Pro when you're ready.
Five domains, watched daily, no card and no clock. Pro adds the deeper SSL and security watching for $15 a month.
Pro
ProMonthly
$15/month
monthly — no annual plan, no lock-in
- CT issuance monitoring. Any new certificate issued for your domain, the moment it happens
- Cert change-detection. Renewals confirmed, unexpected swaps caught
- Hourly checks. Free looks once a day
- 25 monitored domains. Free stays at five
Start watching
Put one site on the trail.
Sign in with your email — we'll mail you a one-time link, no password to remember. Add a site, and that's onboarding.
Send me a magic link