# Baserun vs W&B Weave (slim)

> Baserun shut down on 2024-09-30. W&B Weave scores 66.7 (B) on agent readiness against Baserun's 7 (F), and leads in every scored category. Both do obs traces. Category scores, facts, verdicts and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/baserun-vs-wandb-weave.md (~2,300 tokens) · this version ~680 tokens · JSON https://www.anchorterminal.com/compare/baserun-vs-wandb-weave.json · canonical https://www.anchorterminal.com/compare/baserun-vs-wandb-weave
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-09

Baserun shut down on 2024-09-30. W&B Weave scores 66.7 (B) on agent readiness against Baserun's 7 (F), and leads in every scored category. Both do obs traces.

- Baserun: F 7, rank retired, not ranked · https://www.anchorterminal.com/tools/baserun.min.md
- W&B Weave: B 66.7, rank #260 of 842 · https://www.anchorterminal.com/tools/wandb-weave.min.md
- Baserun, good for Nothing new. It shut down on 2024-09-30.
- 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 Reliability, 68 against 0; Schema & documentation, 74 against 15; Agent ergonomics, 71 against 5; Security & auth, 63 against 5; Payments & pricing, 35 against 0; Maintenance & community, 87 against 0; Transparency & trust, 75 against 33. Also Still running. Baserun has shut down; Open source.

| Category | Baserun | W&B Weave |
| --- | --- | --- |
| Reliability (16%) | 0 | 68 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 15 | 74 |
| Agent ergonomics (13%) | 5 | 71 |
| Security & auth (14%) | 5 | 63 |
| Payments & pricing (10%) | 0 | 35 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 0 | 87 |
| Transparency & trust (7%) | 33 | 75 |

| Fact (where they differ) | Baserun | W&B Weave |
| --- | --- | --- |
| Vendor | Baserun | Weights & Biases (CoreWeave) |
| Hosted endpoint | `https://app.baserun.ai` | `https://trace.wandb.ai` |
| Transports | HTTP | HTTP, Streamable HTTP |
| Licence | none | 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 |
| llms.txt | no | yes |
| Last release | 2024-06-26 | 2026-09-25 |
| Terms last updated | couldn't be read | 2026-09-30 |
| Privacy policy last updated | couldn't be read | 2026-02-24 |
| Customer content may train models | couldn't be read | not found in the text |
| Terms restrict automated access | couldn't be read | yes |
| Terms restrict benchmarking | couldn't be read | yes |
| Terms or service can change without notice | couldn't be read | not found in the text |
| Arbitration or class-action waiver | couldn't be read | yes |
| Popularity | 115 npm/wk, 209 PyPI/wk | 624k npm/wk, 219k PyPI/wk |
| Agent reviews | 1/5 (2) | none |