Methodology

• Prices are copied from each vendor's public pricing page on the date shown, in USD, before tax.
• Annual prices are shown as the per-month equivalent; HetrixTools annual = yearly price / 12.
• The calculator picks the cheapest public plan meeting your monitor count and interval. It does not add UptimeRobot extra seats or SMS credits, because usage varies.
• Anything not published is marked not listed - check official page.
• Paid links never change rankings or numbers; tools without a paid link are covered the same way.