# LangWatch vs Pydantic Logfire (slim)

> LangWatch and Pydantic Logfire score within a point of each other for agent tracing, 65.5 and 64.9 out of 100. Prices, MCP, x402, uptime and agent notes side by side.

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

LangWatch and Pydantic Logfire score within a point of each other on agent readiness, 65.5 (B) and 64.9 (B). Pydantic Logfire leads on agent ergonomics and security & auth. Both do agent tracing.

- LangWatch: B 65.5, rank #318 of 950 · https://www.anchorterminal.com/tools/langwatch.min.md
- Pydantic Logfire: B 64.9, rank #335 of 950 · https://www.anchorterminal.com/tools/pydantic-logfire.min.md
- LangWatch, good for Teams that want tracing, evaluations and simulated-user agent tests in one open-source product, hosted in the EU or self-hosted, and that drive it from a coding assistant through MCP or the CLI. Ahead on Reliability, 53 against 34; Schema & documentation, 87 against 81. Also Runs on your own machine; Open source.
- Pydantic Logfire, good for Teams that want agent traces alongside application logs and metrics in one OpenTelemetry store, queried by SQL from a coding assistant. Ahead on Agent ergonomics, 72 against 67; Security & auth, 80 against 71.

| Category | LangWatch | Pydantic Logfire |
| --- | --- | --- |
| Reliability (16%) | 53 | 34 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 87 | 81 |
| Agent ergonomics (13%) | 67 | 72 |
| Security & auth (14%) | 71 | 80 |
| Payments & pricing (10%) | 40 | 40 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 90 | 90 |
| Transparency & trust (7%) | 75 | 73 |

| Fact (where they differ) | LangWatch | Pydantic Logfire |
| --- | --- | --- |
| Vendor | Reasoning Engine B.V. (LangWatch) | Pydantic Services Inc. |
| Hosted endpoint | `https://app.langwatch.ai` | `https://logfire-us.pydantic.dev/mcp` |
| Transports | HTTP, Streamable HTTP, SSE (legacy), stdio | HTTP, Streamable HTTP |
| Licence | Apache 2.0 for the platform, with an Enterprise licence for the `platform/app/ee` directory. The SDKs and the MCP server are MIT | Proprietary hosted service under the Logfire Terms of Service. The Python, JavaScript and Rust SDKs and the Helm chart are open source, the Python SDK under MIT |
| Tools exposed | 101 | 51 |
| Last release | 2026-10-02 | 2026-10-07 |
| Terms last updated | 2026-09-22 | no date given |
| Privacy policy last updated | 2026-09-29 | 2024-02-21 |
| Terms restrict automated access | yes | not found in the text |
| Terms restrict benchmarking | not found in the text | yes |
| Terms or service can change without notice | yes | not found in the text |
| Arbitration or class-action waiver | not found in the text | yes |
| Popularity | 4.9k stars, 50k npm/wk, 87k PyPI/wk | 4.5k stars, 24k npm/wk, 3.4M PyPI/wk |