# MLflow Tracing vs W&B Weave (slim)

> W&B Weave scores 66.7 (B) to MLflow Tracing's 61.2 (C) for agent tracing. Prices, MCP, x402, uptime and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/mlflow-tracing-vs-wandb-weave.md (~2,800 tokens) · this version ~730 tokens · JSON https://www.anchorterminal.com/compare/mlflow-tracing-vs-wandb-weave.json · canonical https://www.anchorterminal.com/compare/mlflow-tracing-vs-wandb-weave
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-09

W&B Weave scores 66.7 (B) on agent readiness against MLflow Tracing's 61.2 (C), and leads in 2 of 7 scored categories. MLflow Tracing leads on reliability and payments & pricing. Both do agent tracing.

- MLflow Tracing: C 61.2, rank #476 of 950 · https://www.anchorterminal.com/tools/mlflow-tracing.min.md
- W&B Weave: B 66.7, rank #280 of 950 · https://www.anchorterminal.com/tools/wandb-weave.min.md
- MLflow Tracing, good for Teams that already run MLflow or want Apache-2.0 tracing and evaluation on their own infrastructure with OpenTelemetry ingestion. Ahead on Reliability, 76 against 68; Payments & pricing, 60 against 35. Also Runs on your own machine.
- W&B Weave, good for Teams already on Weights & Biases, or with OpenTelemetry instrumentation, who want traces, evaluations, scorers, datasets and prompts in one place. Ahead on Security & auth, 63 against 40; Transparency & trust, 75 against 62. Also A hosted endpoint, with nothing to install; No incidents deducted, where MLflow Tracing loses 6 points for them.

| Category | MLflow Tracing | W&B Weave |
| --- | --- | --- |
| Reliability (16%) | 76 | 68 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 78 | 74 |
| Agent ergonomics (13%) | 72 | 71 |
| Security & auth (14%) | 40 | 63 |
| Payments & pricing (10%) | 60 | 35 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 88 | 87 |
| Transparency & trust (7%) | 62 | 75 |

| Fact (where they differ) | MLflow Tracing | W&B Weave |
| --- | --- | --- |
| Vendor | MLflow Project (LF Projects, LLC) | Weights & Biases (CoreWeave) |
| Hosted endpoint | no (local only) | `https://trace.wandb.ai` |
| Transports | stdio, HTTP | HTTP, Streamable HTTP |
| Auth | OAuth or key | API key |
| Pricing | Free | Freemium |
| Licence | Apache-2.0 | Hosted service under the W&B Master Service Agreement. The Weave SDKs and trace server source on GitHub are Apache-2.0, and the W&B MCP server is MIT |
| Tools exposed | 26 | none |
| Last release | 2026-10-06 | 2026-09-25 |
| Terms last updated | no document linked | 2026-09-30 |
| Privacy policy last updated | no document linked | 2026-02-24 |
| Customer content may train models |  | not found in the text |
| Terms restrict automated access |  | yes |
| Terms restrict benchmarking |  | yes |
| Terms or service can change without notice |  | not found in the text |
| Arbitration or class-action waiver |  | yes |
| Popularity | 28k stars | 624k npm/wk, 219k PyPI/wk |