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Free uptime and monitoring tools

One page per tool, each with the tool itself, the command or formula behind it and a monitor that keeps checking after you leave.

Is my site down Enter your URL and Logdash requests it from its own servers, outside your network, and shows the status code and response time within a few seconds, so you know whether the site is down for everyone or just for you. HTTP status checker Enter a URL and Logdash sends a GET request from its servers, follows up to 5 redirects and shows the final HTTP status code with the time the whole request took. Website response time checker Enter a URL and Logdash times a full GET request from its servers, from DNS lookup to the last byte, then repeats it every 5 minutes so you see a trend instead of one lucky number. Ping monitor online Logdash does not send ICMP ping; it requests your URL over HTTP every 5 minutes for free, which answers what ping cannot: whether the site serves pages, not just whether the machine is switched on. Uptime calculator The uptime calculator turns an uptime percentage into the downtime it allows per day, week, month, quarter and year, so 99.9% comes out as 1m 26.4s a day, 43m 49.8s a month and 8h 45m 57.6s a year. 99.9 uptime calculator At 99.9% uptime the calculator gives 1m 26.4s of allowed downtime per day, 10m 4.8s per week, 43m 49.8s per month, 2h 11m 29.4s per quarter and 8h 45m 57.6s per year. 99.95 uptime calculator At 99.95% uptime the calculator gives 43.2s of allowed downtime per day, 5m 2.4s per week, 21m 54.9s per month, 1h 5m 44.7s per quarter and 4h 22m 58.8s per year. 99.99 uptime calculator At 99.99% uptime the calculator gives 8.64s of allowed downtime per day, 1m 0.48s per week, 4m 22.98s per month, 13m 8.94s per quarter and 52m 35.76s per year. 99.5 uptime calculator 99.5% uptime allows 7m 12s of downtime per day, 50m 24s per week, 3h 39m 9s per month, 10h 57m 27s per quarter and 1d 19h 49m 48s per year, and the calculator on this page does the same sum for any percentage you type. SLA calculator The SLA calculator turns an SLA percentage into the downtime it allows per day, week, month, quarter and year, and multiplies the SLAs of every service in your request path into the composite SLA you can actually promise. Downtime cost calculator The downtime cost calculator multiplies the length of the outage by your revenue per hour and by what the people fixing it cost per hour, and the formula below adds the customers who leave and any SLA credits, so you get one number for one outage. Incident postmortem template Copy the blameless template below into a markdown file within 48 hours of the incident, fill the timeline from your alert timestamps in UTC, and end it with at most three action items that each have an owner and a date. Status page generator Logdash generates a status page from the uptime monitors you already run: publish the hosted page from the dashboard, or put one in your own code with the Next.js starter or a single shadcn command. Uptime badge generator The generator turns any Logdash monitor on a published status page into a live SVG badge, in classic, status or card style, and gives you the markdown or HTML to paste into a README or a site. Cron expression generator The cron expression generator builds a schedule once and writes it in four dialects: classic 5-field Unix cron, 6-field cron with seconds for node-cron and Spring, Quartz, and AWS EventBridge, each with its own field order and weekday numbering.

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