How we rank: Website uptime monitoring
The Score (0–100) is a weighted sum of the factors below. Each factor is the weighted average of its metrics; each metric is calculated from one published fact. Missing facts score zero, and a service is ranked only when enough of its Score is backed by facts.
A service is ranked only when at least 70% of its Score is backed by verified facts.
Price 30%
Monthly list price in USD of the cheapest paid plan with monthly billing: $0 scores 100, $50 or more scores 0 (weight 3). Annual-billing prices and promotions are ignored; per-monitor or per-check pricing without a fixed plan is not used. If the official pricing page shows the monthly price only after a script runs, only as an image, or in a currency chosen by our visitor location, the fact stays empty. A single euro price list of a European vendor is converted at the ECB rate. Also a permanent free plan (weight 1) and the number of monitors it includes, on a logarithmic scale up to 50 (weight 1); a free trial does not count.
| Metric | Rule |
|---|---|
| Cheapest paid plan, monthly billing | Linear from 0 (100) to 50 (0) — lower is better |
| Free plan | Yes = 100, No = 0 |
| Monitors on the free plan | Logarithmic, full score at 50 |
Monitoring 30%
The shortest check interval available on a plan you can buy without talking to sales, on a straight line where 120 seconds or more scores 0, 60 seconds scores 50 and 30 seconds scores 75 (weight 2); how many monitors the cheapest paid plan includes, on a logarithmic scale up to 100 (weight 1); how many check locations or regions the vendor names, on a logarithmic scale up to 100 (weight 1); SSL certificate monitoring (weight 1) and domain expiry monitoring (weight 1). A fact shows that the feature exists on some plan, not that the cheapest plan has it.
| Metric | Rule |
|---|---|
| Shortest check interval on a self-serve plan, seconds | Linear from 0 (100) to 120 (0) — lower is better |
| Monitors on the cheapest paid plan | Logarithmic, full score at 100 |
| Check locations or regions (vendor's count) | Logarithmic, full score at 100 |
| SSL certificate monitoring | Yes = 100, No = 0 |
| Domain expiry monitoring | Yes = 100, No = 0 |
Alerts and status pages 25%
Public status pages (weight 1), SMS alerts (weight 1), phone call alerts (weight 1), Slack alerts (weight 1) and a documented public API (weight 1). Included SMS and call credits differ by plan; check the limits on the plan you choose.
| Metric | Rule |
|---|---|
| Public status pages | Yes = 100, No = 0 |
| SMS alerts | Yes = 100, No = 0 |
| Phone call alerts | Yes = 100, No = 0 |
| Slack alerts | Yes = 100, No = 0 |
| Public API | Yes = 100, No = 0 |
Account security and track record 15%
Two-factor authentication for user accounts (weight 1), single sign-on through SAML or another identity provider (weight 1) and how long the service has been running: 15 years or more scores 100 (weight 1).
| Metric | Rule |
|---|---|
| Two-factor authentication | Yes = 100, No = 0 |
| Single sign-on (SSO) | Yes = 100, No = 0 |
| Founded | Full score at 15+ years |