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TensorZero vs Langfuse
Quick verdict
TensorZero and Langfuse are closely matched on licensing, self-hosting and OpenTelemetry support — the decision comes down to pricing and framework integrations below.
Side-by-side comparison from the Agent Observability Index: licensing, self-hosting, pricing model and integrations — no vendor copy, primary sources linked.
| TensorZero | Langfuse | |
|---|---|---|
| One-liner | Open-source LLMOps stack unifying gateway, observability, evaluations, optimization and experimentation. | 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 | Yes | Yes |
| Self-hostable | Yes | Yes |
| Pricing model | free | freemium |
| Pricing notes | Fully open source (Rust gateway + ClickHouse storage) | 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, vLLM | langchain, openai-sdk, llamaindex, litellm, opentelemetry, vercel-ai, haystack |
| GitHub stars | 11.5k | 29k |
| Maturity (GitHub signal) | 100/100 (Mature) | 90/100 (Mature) |
| Funding / ownership | $7.3M seed (2025) | YC W23; $4M seed (Lightspeed, La Famiglia) |
How to choose
- Both link to primary pricing sources below — verify current tiers before committing; this market shifts monthly.
Sources: TensorZero · Langfuse
Frequently asked questions
Is TensorZero or Langfuse open source?
TensorZero: Yes. Langfuse: Yes.
Can TensorZero and Langfuse be self-hosted?
TensorZero: Yes. Langfuse: Yes.
TensorZero vs Langfuse: which should I choose?
TensorZero and Langfuse are closely matched on licensing, self-hosting and OpenTelemetry support — the decision comes down to pricing and framework integrations below.