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TensorZero
Open-source LLMOps stack unifying gateway, observability, evaluations, optimization and experimentation.
| Category | Observability & Tracing |
| OpenTelemetry-native | Yes — no proprietary-SDK lock-in |
| Open source | Yes |
| Self-hostable | Yes |
| Pricing model | free |
| Pricing notes | Fully open source (Rust gateway + ClickHouse storage) |
| Framework integrations | OpenAI SDK, Anthropic, vLLM |
| Funding / ownership | $7.3M seed (2025) |
| GitHub stars | 11,461 |
| Maintenance | active (commit 2026-06-11) |
| License (GitHub) | Apache-2.0 |
| Open issues | 393 |
| Maturity signal | 100/100 (Mature) — computed from public GitHub signals, see methodology |
Pricing/feature source: https://github.com/tensorzero/tensorzero
Maturity signal is computed from public GitHub data only. How it is calculated.
Frequently asked questions
Is TensorZero open source?
Yes. Licensed under Apache-2.0.
Can I self-host TensorZero?
Yes — TensorZero can run in your own infrastructure.
Is TensorZero OpenTelemetry-native?
Yes — TensorZero speaks OpenTelemetry (OTLP) natively, so there is no proprietary-SDK lock-in.
How much does TensorZero cost?
Free. Fully open source (Rust gateway + ClickHouse storage)