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CheckAPI – open-source API monitoring built with FastAPI and Next.js

CheckAPI – open-source API monitoring built with FastAPI and Next.js

by JEONSEWON·Feb 21, 2026·2 points·0 comments
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AI Analysis

●MidShip It

Well-built but monitors APIs same way Betterstack, UptimeRobot, and 20 others do.

Strengths
  • •Multi-channel alerts (Slack, Discord, Telegram, webhooks) reduce notification silos
  • •Self-hosting option gives teams data control Betterstack doesn't
  • •Clean UI and transparent pricing ($5-15/mo) undercut SaaS incumbents
Weaknesses
  • •API monitoring is solved; no novel detection, alerting logic, or architectural advantage
  • •No evidence of uptime reliability claims (own monitoring shows 99.8%, but unverified)
Category
SaaS
Target Audience

Developers and small teams needing affordable uptime monitoring

Similar To

Betterstack · UptimeRobot · Datadog RUM

Post Description

Built CheckAPI - an open source API monitoring tool for developers.

Tech stack: - FastAPI backend with Celery workers - Next.js 14 frontend - Redis for job queue - Multi-channel alerts (Email, Slack, Telegram, Discord, Webhook)

Free tier: 3 monitors Paid: $5-15/mo

GitHub: https://github.com/JEONSEWON/api-health-monitor

Built in 6 weeks with AI assistance (OpenClaw). Made it open source so others can learn from it or self-host.

Feedback welcome, especially on the tech architecture.

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