Healthchecks.io keeps pricing simple: a free Hobbyist plan with 20 checks and 3 team members, Business at $20/mo with 100 checks and 10 members, and Business Plus at $80/mo with higher limits (as published July 2026 — verify with the vendor). It's also open source — self-hosting is free if you run the infrastructure yourself. There's a Supporter tier for people who simply want to fund the project, which tells you something good about how it's run.
The boundary isn't price — it's scope. Healthchecks.io is deliberately passive: it listens for pings and alerts when they stop. It cannot probe a URL, watch an SSL certificate, detect DNS drift, or host a customer-facing status page. Production teams pair it with an active uptime tool, so the real monthly cost is Healthchecks.io plus that second product.
FourSight prices both halves as one product: Starter $16/mo covers 50 active uptime monitors; Growth $40/mo adds heartbeat/cron monitors (5-field cron expressions, grace periods) alongside 100 monitors across all 8 check types, escalation policies, and 5 status pages.