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CatchJS provides real-time JavaScript error monitoring for web applications with instant alerts and diagnostics. · CatchJS · Observability

Overview

CatchJS offers a straightforward way to monitor and debug JavaScript errors in web applications, ideal for small projects or early-stage products.

Good fit

Use CatchJS's 14-day trial to evaluate real-time JavaScript error monitoring, or apply for a free open source subscription.

  • frontend developers
  • indie makers
  • small teams
  • open source projects

Not a fit

Avoid if you need a permanent free plan for commercial use; CatchJS is paid only after the trial ends.

  • need backend error tracking
  • need a permanent free commercial plan
  • monitoring multiple high-traffic sites
Quickstart · 5 steps
  1. Start a free 14-day trial on the CatchJS Development plan.
  2. Create a new project in the dashboard.
  3. Copy the provided JavaScript snippet.
  4. Paste the snippet into your website's HTML before the closing </body> tag.
  5. Deploy your site and verify error reporting in the CatchJS dashboard.

Other free observability options

Datadog · Observability
Up to 5 hosts (Free plan) · 1-day metric retention (Free plan) · 14-day free trial of Pro/Enterprise features
Billing risk: None
No card
New Relic · Observability
100 GB/month data ingest · Unlimited basic users, 1 full platform user · 500 synthetic checks/month
Billing risk: None
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Sentry · Observability
5,000 errors/month · 5 GB logs and metrics/month · 5M spans/month
Billing risk: None
No card
UptimeRobot · Observability
50 monitors · 5-minute check interval
Billing risk: None
No card