Uptime Robot is the most popular uptime monitoring tool, with millions of users on its free tier. It is also cheaper than Warden, and it checks from more places. Warden is worth a look for one specific reason: if you run sites for clients and each client needs their own login to their own status page, Warden does that and Uptime Robot does not. Here’s how they compare.
TL;DR Comparison
| Feature | Warden | Uptime Robot |
|---|---|---|
| Type | Open-source, self-hosted + managed | Managed SaaS |
| Min check interval | 10 seconds | 30 seconds (paid), 5 min (free) |
| Check locations | One — wherever you install it | Multiple (paid) |
| Check types | HTTP(S) | HTTP, ping, port, keyword |
| Per-client login | Yes (status_viewer role) | No — shared page password |
| SSL monitoring | Built-in | Paid add-on |
| Status pages | Built-in | Paid plans |
| Alerting | Slack, JSON webhook | Slack, email, SMS, webhooks |
| Open source | Yes (AGPL-3.0) | No |
| Free tier | Self-hosted (unlimited) | 50 monitors, 5-min intervals |
| Paid pricing | From $99/mo (we host it) | Team $34/mo |
Check Frequency
This is the biggest differentiator. Uptime Robot’s free tier checks every 5 minutes. That means up to 5 minutes of undetected downtime per incident. Even their paid plans only go down to 30-second intervals.
Warden checks every 10 seconds. For a service with a 99.9% SLA (43 minutes of allowed downtime per month), the difference is significant:
- 5-minute intervals: Each undetected period burns ~11.6% of your monthly error budget
- 30-second intervals: Each undetected period burns ~1.2%
- 10-second intervals: Each undetected period burns ~0.4%
If your downtime costs are high, faster detection translates directly to money saved.
Check Locations
This one goes to Uptime Robot. It checks from multiple regions on paid plans. Warden has no remote probes and no multi-region checks — every check runs from the single host Warden is installed on, self-hosted or managed. If you need to know that your site is reachable from three continents, Warden cannot tell you that.
What Warden does instead is cut false positives at the logic layer: confirmation thresholds before an alert fires, recovery confirmation before it clears, cooldowns between notifications, and flap detection with stabilization. That helps with a flapping endpoint. It does not help with a regional network issue.
SSL Certificate Monitoring
Warden includes SSL monitoring as a core feature. It alerts in stages at 30, 14, 7 and 1 days before expiry, and detects renewal.
Uptime Robot added SSL monitoring in paid plans, but it’s a separate check type rather than being integrated into every HTTP check.
Expired SSL certificates cause immediate, total outages (browsers show security warnings that block access). This monitoring should be standard, not a paid add-on. Check your current certificates with our SSL checker.
Status Pages
Both tools offer status pages, but with different approaches:
- Warden: Built-in status pages on all tiers. One page per group, each with its own slug, logo, favicon, accent colour, theme and uptime window, plus incident timelines, maintenance windows and RSS. Pages live at
your-warden-host/status/slug— no custom domains - Uptime Robot: Status pages available on paid plans. The free tier doesn’t include them
The real split is access. Uptime Robot protects a private status page with a shared password. That is not a login: there is no client identity, you can’t revoke one client without changing the password for everyone, and you can’t see who looked. Warden’s status_viewer role is a real account scoped to one page. If you hand status pages to clients, that difference is the whole reason to look at Warden.
Pricing Comparison
Uptime Robot:
- Free: 50 monitors, 5-min intervals
- Team: $34/mo
Warden:
- Community: $0, self-hosted, unlimited clients (AGPL-3.0)
- Agency: $99/mo, up to 20 clients — we run it for you
- Pro: $249/mo, up to 50 clients
- Setup: $299 one-time on any paid plan
Uptime Robot is roughly 3x cheaper than Warden, and that is not close. If price is the deciding factor, take Uptime Robot — we will not win that argument. Warden bills per client, not per check or per seat, which works out around $5/client/month at the Agency tier; agencies typically bill that back to each client as a line item. But you are paying for per-client logins, not for a cheaper checker.
Warden’s Community tier is $0 and self-hosted if you’d rather run it yourself.
When to Choose Uptime Robot
- Cost matters — it is significantly cheaper
- You need checks from multiple regions
- You need ping, port or keyword checks
- 5-minute check intervals are acceptable for your SLA
- You don’t want to manage infrastructure
- A shared status-page password is good enough for your clients
When to Choose Warden
- Each client needs their own login, scoped to their own status page, revocable on its own
- You need check intervals under 30 seconds
- You want full control over your monitoring infrastructure (self-hosted)
- You need integrated SSL monitoring without paying extra
- You’d rather be billed per client than per monitor
- You prefer open-source tools you can audit and extend
Migration
Moving from Uptime Robot to Warden is straightforward for HTTP checks — export your monitor list and recreate them in Warden. Ping, port and keyword checks have no equivalent: Warden is HTTP(S) only, so those don’t move.
Join the Warden waitlist to get early access.
Related tools:
- Uptime Calculator — Calculate downtime for any SLA
- Downtime Cost Calculator — Quantify what outages cost
- SSL Checker — Check your certificate status now