Compare
OpenLIT vs Arize Phoenix
OpenLIT vs Arize Phoenix
Both are open-source options for LLM tracing and evaluation. OpenLIT is Apache 2.0 and OpenTelemetry-native with Prompt Hub, agent monitoring, Vault, and GPU telemetry in one self-hosted platform. Phoenix centres on OpenInference tracing and eval workflows under Elastic License 2.0.
| Feature | OpenLIT | Arize Phoenix |
|---|---|---|
| Core Architecture | ||
| OpenTelemetry-native | OpenInference / OTel-friendly tracing | |
| Open Source | Apache 2.0 | Elastic License 2.0 |
| Self-hostable | ||
| Cloud-managed option | Coming soon | |
| Vendor-neutral OTLP export | Via OTel / export paths | |
| LLM Monitoring | ||
| Token usage tracking | ||
| Cost per request | ||
| Latency / p95 metrics | ||
| Prompt & response logging | ||
| Broad LLM / framework auto-instrumentation | ||
| Infrastructure Monitoring | ||
| GPU monitoring (NVIDIA + AMD) | ||
| Vector DB tracing | ||
| Multi-environment tagging | ||
| Developer Tools | ||
| Prompt Hub (versioning) | Eval / playground oriented | |
| Evaluations (LLM-as-a-judge) | ||
| Secrets Vault | ||
| Fleet Hub (multi-deployment) | ||
| AI agent monitoring UI | Via traces | |
| Observability Backends | ||
| Grafana / Prometheus export | Via export / OTel | |
| Any OTLP-compatible backend | Via OTel paths | |
Choose OpenLIT when…
- You need Apache 2.0 rather than Elastic License 2.0 for compliance or redistribution
- You want Prompt Hub, Vault, agent monitoring, and GPU metrics in the same self-hosted product as traces
- You want fully OpenTelemetry-native spans you can forward to any OTLP backend
- You prefer one AI engineering platform instead of stitching eval UI + separate ops tooling
Choose Arize Phoenix when…
- You prefer Phoenix’s tracing and evaluation UX and are comfortable with Elastic License 2.0
- Your workflows centre on OpenInference and Phoenix notebooks / eval experiments
- You already use Arize’s broader ML observability ecosystem
More Comparisons
Get started
Ready to use the OpenLIT UI in production?
Self-host or connect your stack in minutes. Same harness UI for traces, dashboards, prompts, and evaluations.