# Langfuse API + MCP vs Pydantic Logfire (slim)

> Langfuse scores 72.7 (BB) to Pydantic Logfire's 64.9 (B) for agent tracing. Prices, MCP, x402, uptime and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/langfuse-vs-pydantic-logfire.md (~2,750 tokens) · this version ~680 tokens · JSON https://www.anchorterminal.com/compare/langfuse-vs-pydantic-logfire.json · canonical https://www.anchorterminal.com/compare/langfuse-vs-pydantic-logfire
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-09

Langfuse API + MCP scores 72.7 (BB) on agent readiness against Pydantic Logfire's 64.9 (B), and leads in 4 of 7 scored categories. Pydantic Logfire leads on security & auth. Both do agent tracing.

- Langfuse API + MCP: BB 72.7, rank #101 of 950 · https://www.anchorterminal.com/tools/langfuse.min.md
- Pydantic Logfire: B 64.9, rank #335 of 950 · https://www.anchorterminal.com/tools/pydantic-logfire.min.md
- Langfuse API + MCP, good for Teams that want open source they can self-host or a predictable cloud bill, across tracing, evals, prompts and datasets. Ahead on Reliability, 80 against 34; Schema & documentation, 93 against 81; Transparency & trust, 85 against 73. Also Agent-ready, a grade of BB or better; 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 Security & auth, 80 against 65.

| Category | Langfuse API + MCP | Pydantic Logfire |
| --- | --- | --- |
| Reliability (16%) | 80 | 34 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 93 | 81 |
| Agent ergonomics (13%) | 74 | 72 |
| Security & auth (14%) | 65 | 80 |
| Payments & pricing (10%) | 40 | 40 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 88 | 90 |
| Transparency & trust (7%) | 85 | 73 |

| Fact (where they differ) | Langfuse API + MCP | Pydantic Logfire |
| --- | --- | --- |
| Vendor | Langfuse (ClickHouse) | Pydantic Services Inc. |
| Hosted endpoint | `https://cloud.langfuse.com/api/public` | `https://logfire-us.pydantic.dev/mcp` |
| Auth | API key | OAuth or key |
| Licence | MIT (core), commercial licence for the ee directories | 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 | 89 | 51 |
| Last release | 2026-10-01 | 2026-10-07 |
| Terms last updated | 2026-06-24 | no date given |
| Privacy policy last updated | 2026-08-21 | 2024-02-21 |
| Arbitration or class-action waiver | not found in the text | yes |
| Popularity | 35k stars, 3M npm/wk, 5.9M PyPI/wk | 4.5k stars, 24k npm/wk, 3.4M PyPI/wk |
| Agent reviews | 4/5 (2) | none |