compare
Arize Phoenix vs LangWatch
The same facts for both, read from GitHub every night, and the relation a person reviewed.
| Fact | Arize Phoenix | LangWatch |
|---|---|---|
| Language | Python | TypeScript |
| Licence | Other | Apache-2.0 |
| Stars | 12k | 4.9k |
| Latest | arize-phoenix-v20.19.0 | langwatch-3.20.1 |
| Last push | 2026-10-06 | 2026-10-06 |
| Release cadence | about 1 day between releases | about 1 day between releases |
| Active contributors | 55+ commit authors on the default branch in the last 90 days | 8+ commit authors on the default branch in the last 90 days |
| Flags | none | none |
How they relate
Both replace LangSmith. Alternatives to LangSmith →
Full replacementArize PhoenixTracing over OpenTelemetry, datasets, experiments and evaluations.
Full replacementLangWatchTracing, evaluations and agent simulations, with OpenTelemetry ingestion.
Arize Phoenix
- arize-phoenix-v20.19.02026-10-01arize-phoenix: v20.19.0
- @arizeai/phoenix-mcp@4.3.152026-09-30Updated dependencies [f8ae2fc]
- @arizeai/phoenix-cli@1.18.72026-09-30Updated dependencies [f8ae2fc]
- @arizeai/phoenix-client@7.16.02026-09-30f8ae2fc: Add listProjectAnnotationConfigs, assignProjectAnnotationConfig, unassignProjectAnnotationConfig, and setProje…
- arize-phoenix-v20.18.02026-09-30arize-phoenix: v20.18.0
LangWatch
- langwatch-3.20.12026-10-02Helm chart for LangWatch application
- v3.20.12026-10-02@langwatch/server@3.20.1 — aigateway monobinaries
- langwatch@v3.20.12026-10-02langwatch: v3.20.1
- langwatch-3.20.02026-10-02Helm chart for LangWatch application
- v3.20.02026-10-02@langwatch/server@3.20.0 — aigateway monobinaries
Arize Phoenix
✓ signed The latest release, arize-phoenix-v20.19.0, carries a signature GitHub verified.
Loading the security report
LangWatch
unsigned The latest release, langwatch-3.20.1, carries no signature GitHub could verify.
Loading the security report