Best Open Source Error Tracking Tools in 2026

Sentry Team costs $26/month for 50K events. Datadog Error Tracking costs $15/host/month. Here are the best open source alternatives.

Quick Comparison

Tool	Best For	License	Stars	Self-Host RAM
Sentry	Full-featured	BSL → Apache-2.0	39K+	8-16 GB
GlitchTip	Lightweight Sentry	MIT	1K+	1-2 GB
Highlight.io	Error + session replay	Apache-2.0	8K+	4-8 GB
Bugsink	Simple errors	BSL	2K+	512 MB

Key Differences

Sentry (Self-Hosted) — Most Complete

• Error tracking for 100+ platforms
• Performance monitoring
• Session replay
• Profiling
• Cron monitoring
• Release tracking
• Source maps
• 20+ containers to run

GlitchTip — Best Lightweight

• Sentry-compatible (use Sentry SDKs!)
• Error tracking
• Performance monitoring
• Uptime monitoring
• 80% of Sentry at 10% of resources
• 3 containers (app, db, redis)
• MIT license

Highlight.io — Best Full-Stack

• Error tracking
• Session replay (watch user sessions)
• Log management
• Traces
• All-in-one observability
• Modern UI

Choosing the Right Tool

Need	Choose
Full-featured (budget for resources)	Sentry
Lightweight (limited server)	GlitchTip
Error + session replay	Highlight.io
Simplest possible	Bugsink

Cost Savings

Events/month	Sentry Team	Self-Hosted GlitchTip	Annual Savings
50K	$312/year	$54/year (VPS)	$258
500K	$3,120/year	$96/year	$3,024

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Compare all error tracking tools on OSSAlt — features, SDKs, and resource requirements side by side.