telemetry.dev vs Langfuse
Both trace LLM apps and AI agents: model calls, tool calls, cost and latency. telemetry.dev is a newer OpenTelemetry-based service; Langfuse is an established open-source LLM engineering platform you can also self-host.
| telemetry.dev ↗ | Langfuse | |
|---|---|---|
| Free plan | $0: 30k ingestion units/month, 14-day retention, 1 project, 2 seats | Hobby $0: 50k units/month, 30 days data access, 2 users |
| Entry paid plan | Pro $25/month: 500k units, 30-day retention, 5 projects, 5 seats | Core $29/month: 100k units then $8 per 100k, 90 days data access, unlimited users |
| Next tier | Team $50/month: 2M units, 90-day retention, unlimited projects and seats | Pro $199/month: unlimited history, high rate limits |
| Overage | Ingestion continues above the included amount with no automatic overage charges | $8 per 100k extra units |
| Self-hosting | Hosted service | Yes, self-hosted option |
Which should you pick?
Pick telemetry.dev for a cheap, OpenTelemetry-native hosted tracer with no surprise overage bills. Pick Langfuse if you want to self-host or need its larger feature set and unlimited users on the paid plan.
FAQ
Is telemetry.dev free?
Yes. The Free plan is $0 with 30,000 ingestion units a month and no credit card.
Is Langfuse free?
Yes. The Hobby plan on Langfuse Cloud is free with 50k units a month, and you can self-host.
Which has more free usage?
Langfuse Hobby includes 50k units a month versus 30k on telemetry.dev Free, though the two count units their own way.
Sources (official pages, checked 2026-10-31): telemetry.dev pricing · Langfuse pricing. Prices change often, so check the official page before buying.
More
Best AI tools for AI agents & assistants · Cursor vs Windsurf · Cursor vs Claude Code · Lovable vs Bolt.new · ChatGPT vs Claude