Watch three sites, servers or services around the clock, and get alerted the moment one stops answering. No credit card to start, no trial clock counting down, and no capability held back for the paid tiers.
Plenty of tools call a tier free, then hold back the parts that make monitoring useful — the integration you need, the alert that wakes someone, the certificate warning. Hesklo splits it the other way. Every capability is open on the free plan; the plan sets the scale.
HTTP, ping, TCP and SSH. Each of your three monitors can be a different one.
Chat, email, SMS, paging and ticketing are all open on the free plan. Nothing is held back for paid tiers.
Branches, waits, repeat alerts, schedule gates, condition checks and HTTP actions — the same editor paid accounts use.
Every HTTPS check records how many days a certificate has left, and a policy can alert before it lapses.
A failure is confirmed across consecutive checks before it counts as an outage, so one bad response pages nobody.
Seven days of outages with their cause and duration, alongside uptime and response-time charts.
Put routine notices behind working hours while the critical path stays open overnight.
An optional Monday note on how your monitors did last week. Off until you turn it on.
Three is the cap. Paid plans start at ten monitors for seven euros a month.
Compare plansEvery paid plan checks every minute; Team and Business check every thirty seconds.
See check intervalsPaid plans keep thirty, ninety or a hundred and eighty days of incidents and response times.
How history worksPublishing selected monitors to your own subdomain starts on the Essential plan.
About status pagesShared accounts and a painted on-call week come with the Team and Business plans.
About on-call schedulingA monitor is one thing watched on one check, and each of your three can be a different type. Point them at a public site, an internal database port, or a machine you reach over SSH.
Watch any URL. Match an exact status code or accept any 2xx, and optionally require a string in the body. SSL certificate expiry is tracked on every HTTPS check.
More on http monitoringA plain ICMP check for whether a machine answers at all — the simplest signal that a host is still alive.
More on ping monitoringOpen a connection to a host and port to confirm a database, cache or service is accepting connections, without issuing a full request.
More on tcp monitoringConnect over SSH and run one of a fixed set of read-only diagnostics: service active, disk usage, memory usage or load average.
More on ssh monitoringA free monitor is not limited to an email when something breaks. Draw the response on the same visual canvas: notify a channel, hold for five minutes, check whether it recovered, then page a person if it has not. Configure a destination once and any step in any policy can reach it.
Branch on monitor state, wait for a duration, gate on working hours, repeat until someone acknowledges, or call an endpoint to try a fix before waking anyone.
Chat, email, SMS, phone, push, paging and ticketing are all available on the free plan, with credentials encrypted at rest and a Send test button to confirm each one before you rely on it.
There is no onboarding call and nothing to install. From a cold start, the first monitor is usually running inside two minutes.
An email address and a password. No card, no sales call, nothing to cancel later.
Paste a URL, hostname or host and port, choose the check type, and it starts running on the next tick.
Connect the monitor's down port to a notify step, add a wait and a second step behind it, and the policy runs itself from there.
Most "free" uptime monitoring is a trial wearing the word. The distinction is simple enough to put in a table.
| Hesklo free plan | A typical free trial | |
|---|---|---|
| How long it lasts | Forever. There is no clock on the account. | Seven to thirty days, then it stops. |
| Credit card up front | Never asked for. | Usually required to begin. |
| What happens at the end | Nothing. Your monitors keep running. | Monitoring stops, or the card is charged. |
| Integrations available | All of them, the same as every paid plan. | Often full access, until it ends. |
| What paying changes | How much you watch and how often — not what you can do. | Whether you have the product at all. |
Three monitors, every alert destination and the full escalation canvas, free forever. Add a check, draw what happens when it fails, and watch it run.