Aviationstack ◆
Aviationstack is a scalable REST API for real-time flight tracking, historical flight data, airport info, and global aviation data.

Hesklo (Developer Tools): Hesklo is an uptime monitoring and on-call escalation platform that helps engineering teams detect and resolve incidents faster. Pricing: from $7/mo (free plan available). (data verified August 2026)
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Hesklo is a unified uptime monitoring and on-call escalation platform. It watches your websites, APIs, and infrastructure, and when a check fails, it automatically runs your team's escalation policy—routing the incident to the right person at the right time through tools you already use (like Slack, PagerDuty, or SMS). This eliminates the need to juggle separate monitoring and on-call tools, giving you a single source of truth during an outage.
Hesklo is designed for engineering teams and DevOps professionals who need reliable detection and response for their production systems. It's ideal for teams that want to streamline incident management without building complex custom integrations. If you're a solo developer or a small team, the free plan offers 3 monitors with 5-minute checks—perfect for keeping tabs on critical side projects.
Hesklo supports four check types (HTTP, ping, TCP, SSH) and offers a visual escalation canvas to design policies with branching, waits, and time gates. It includes integrations with Slack, Discord, Teams, Email, SMS, PagerDuty, Jira, and Webhook—all available on every plan. Paid plans add a public status page, and Team and Business plans include on-call scheduling and more team seats. With 30-second minimum check intervals and 180-day history on higher tiers, it's built for serious production use.
Hesklo is not a general-purpose monitoring tool for network infrastructure or database performance deep-dives. It focuses on endpoint/API availability and alerting, not metrics collection or log analysis. If you need full-stack APM or log management, you'd pair Hesklo with a dedicated tool.
Editorial score from our review methodology — not user ratings.
Hesklo pricing: from $7/mo (free plan available). Billing model: Freemium.
All plans include all eight integrations. Cancel any time. No credit card required for free plan.