Comparison
Compare at a glance
Headline prices are close; the differences are in intervals, seats and how SMS/phone alerts are billed.
| Tool | Free tier | Cheapest paid (annual / monthly) | Fastest public interval | Alert add-ons |
|---|---|---|---|---|
| UptimeRobot | 50 monitors, 5 min | $12 / $13 (Solo, 10 monitors) | 15 s (Scale) | SMS/voice via one-time credits |
| Better Stack | 10 monitors, interval not listed - check official page | $29 / $34 per responder license | 30 s | Phone + SMS unlimited per license |
| HetrixTools | 15 monitors, 1 min | $8.33 / $9.95 (Professional, 30 monitors) | 1 min | 25-50 SMS/month on some plans |
Worked examples (annual billing, list price)
- Hobby, 20 sites, 5-minute checks, 1 person: UptimeRobot Free $0; HetrixTools Free covers 15 so Professional $8.33; Better Stack free covers 10 so 1 license + 1 pack = $50.
- Agency, 80 sites, 1-minute, 3 people on call: UptimeRobot Team $39 (3 seats incl.); HetrixTools Enterprise $41.66 (200 monitors; seats are sub-accounts); Better Stack 3 licenses + 2 packs = $129.
- 30-second checks, 50 monitors, 1 person: UptimeRobot Team $39; Better Stack 1 license + 1 pack = $50; HetrixTools does not offer 30 s.
Run your own numbers in the calculator.