OnlineOrNot

A SaaS uptime and synthetic monitoring platform that checks websites, APIs, browser flows, cron jobs and heartbeats to catch outages, failed deploys, expired SSL certificates and silent background job failures before customers are affected. It sells to developers, operations and IT teams in freelance, agency, startup, SMB and larger businesses that operate customer-facing websites, web apps and APIs. It is positioned as a simpler alternative to complex enterprise tools and more reliable than basic checkers, using multi-location verification and failure confirmation to reduce false positives.

Key features

• Website monitoring every 30 seconds
• Multi-location verification
• Configurable HTTP method headers body
• Status code and content assertions
• SSL certificate expiration monitoring
• API monitoring with JSON assertions
• Playwright browser checks in Chrome
• Cron job monitoring via check-in URL
• Heartbeat monitoring
• Status pages with subscriber notifications
• Alert routing to Slack PagerDuty SMS
• Webhooks and incident tool integrations
• Public API and open-source CLI