Each plan card above lists its limits, and the service enforces them itself: an extra monitor is refused with an upgrade prompt, a faster interval than the plan allows is rounded to the plan's floor, and detailed history older than the plan's retention is pruned while daily uptime is kept. Heartbeat monitors are available on every plan and count towards the monitor limit. Certificate and domain expiry monitors and the public status page are included only on the plans that list them. "Unlimited" means not metered for the ordinary use of one customer, within our fair-use rules; on an unlimited plan detailed history is kept for 365 days.
Every plan is a recurring monthly subscription except the Day Pass, which is a single charge for 24 hours. You can cancel at any time, without logging in — Easy to Cancel stops future charges immediately and confirms by email — and refund requests within 30 days of any charge are honoured in full. How checks, alerts and status pages work in detail: How monitoring works.