Arize Phoenix vs OpenLLMetry
OpenLLMetry leads on trust: 84.2/100 (Grade A) against 76.9/100 (Grade B), a 7.3-point gap. Arize Phoenix leads on maintenance and rests on broader evidence; OpenLLMetry leads on supply-chain integrity and transparency. Note: OpenLLMetry's evidence coverage is thinner (coverage B vs A) — its score rests on fewer independent signal types.
AI Observability & Evaluation
Choose Arize Phoenix if maintenance matters most.
- +6.1Maintenance: last push today, against 1d ago
- A vs BEvidence coverage: 4 of 5 independent signal types, against 3
Open-source observability for your GenAI or LLM application, based on OpenTelemetry
Choose OpenLLMetry if supply-chain integrity and transparency matter most.
- +7.0Safety / Integrity
- +5.4Transparency
Where they differ
1 dimension identical: Identity 18.0 · Full evidence table
An independent, evidence-based trust comparison of Arize Phoenix and OpenLLMetry, two Observability & Evaluation projects in the HVTracker registry. Scores come from public, checkable signals — supply-chain provenance, OSSF Scorecard, maintenance, and adoption — not popularity.
Full evidence
| Signal | Arize PhoenixArize-AI/phoenix | OpenLLMetrytraceloop/openllmetry |
|---|---|---|
| HVTrust score | 76.9 | 84.2 |
| Evidence grade | B | A |
| Coverage grade | A | B |
| Overall rank | #236 | #114 |
| Rank in Observability & Evaluation | #8 | #5 |
| GitHub stars | 12.2k | 7.5k |
| Last updated | today | 1d ago |
| Build provenance | Yes | Yes |
| OSSF Scorecard | — | 6.3 / 10 |
| License | NOASSERTION | Apache-2.0 |
| Downloads | 137k/wk | 449k/wk |
| Trust dimensions (points earned) | ||
| Safety / integrity / 25 | 12.5 | 19.5 |
| Identity & provenance / 18 | 18.0 | 18.0 |
| Transparency / 17 | 8.5 | 13.9 |
| Maintenance / 20 | 20.0 | 13.9 |
| Adoption / 20 | 16.7 | 16.8 |
| Runtime capability surface (full matrix) | ||
| MCP server | Implemented | Implemented |
| External providers | 6 — Amazon Bedrock, Anthropic, E2B, … | 9 — Amazon Bedrock, Anthropic, Cohere, … |
| Requires API keys | No | No |
| Plugin surface | plugins | — |
| Provenance drift | Partial | Match |
How to read this: HVTrust (0–100) weighs supply-chain signals (provenance, OSSF Scorecard, signed commits, open license) alongside real-world adoption, scaled by an evidence-confidence factor. Grade bands: A ≥ 80, B ≥ 65, C ≥ 50, D < 50. Signals refresh daily. Full methodology v4.4 →