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Datadog LLM Observability vs Langfuse
Quick verdict
Key difference: Langfuse is open-source while Datadog LLM Observability is proprietary; Langfuse can be self-hosted while Datadog LLM Observability is cloud-only.
Side-by-side comparison from the Agent Observability Index: licensing, self-hosting, pricing model and integrations — no vendor copy, primary sources linked.
| Datadog LLM Observability | Langfuse | |
|---|---|---|
| One-liner | LLM and agent tracing inside the Datadog APM suite, attractive to teams already standardized on Datadog for infrastructure monitoring. | Open-source (MIT) LLM engineering platform combining tracing, prompt management, evals and datasets, widely used as the default self-hosted observability stack. |
| Category | Observability & Tracing | Observability & Tracing |
| OpenTelemetry-native | Yes | Yes |
| Open source | No | Yes |
| Self-hostable | No | Yes |
| Pricing model | paid | freemium |
| Pricing notes | Free up to 40k LLM spans/mo; Pro from ~$160/mo incl. 100k LLM spans, billed per span thereafter | Free Hobby tier (50k units/mo); Core $29/mo, Pro $199/mo, unlimited users on paid tiers; MIT core fully self-hostable |
| Frameworks | openai-sdk, anthropic, langchain, amazon-bedrock, opentelemetry | langchain, openai-sdk, llamaindex, litellm, opentelemetry, vercel-ai, haystack |
| GitHub stars | — | 29k |
| Maturity (GitHub signal) | — (no public repo) | 90/100 (Mature) |
| Funding / ownership | Public company (NASDAQ: DDOG) | YC W23; $4M seed (Lightspeed, La Famiglia) |
How to choose
- Choose Langfuse if open-source licensing or full data control is a hard requirement.
- Langfuse can run inside your own infrastructure; Datadog LLM Observability is cloud-only.
- Both link to primary pricing sources below — verify current tiers before committing; this market shifts monthly.
Sources: Datadog LLM Observability · Langfuse
Frequently asked questions
Is Datadog LLM Observability or Langfuse open source?
Datadog LLM Observability: No. Langfuse: Yes.
Can Datadog LLM Observability and Langfuse be self-hosted?
Datadog LLM Observability: No. Langfuse: Yes.
Datadog LLM Observability vs Langfuse: which should I choose?
Key difference: Langfuse is open-source while Datadog LLM Observability is proprietary; Langfuse can be self-hosted while Datadog LLM Observability is cloud-only.