# LangWatch vs Opik API + MCP (slim)

> Opik scores 71.7 (BB) to LangWatch's 65.5 (B) for agent tracing. Prices, MCP, x402, uptime and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/langwatch-vs-opik.md (~2,900 tokens) · this version ~830 tokens · JSON https://www.anchorterminal.com/compare/langwatch-vs-opik.json · canonical https://www.anchorterminal.com/compare/langwatch-vs-opik
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · MCP: https://www.anchorterminal.com/mcp · Updated: 2026-10-18
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Opik API + MCP scores 71.7 (BB) on agent readiness against LangWatch's 65.5 (B), and leads in 3 of 7 scored categories. LangWatch leads on security & auth, payments & pricing and maintenance & community. Both do agent tracing.

- LangWatch: B 65.5, rank #347 of 1135 · https://www.anchorterminal.com/tools/langwatch.min.md
- Opik API + MCP: BB 71.7, rank #123 of 1135 · https://www.anchorterminal.com/tools/opik.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 Security & auth, 71 against 57; Payments & pricing, 40 against 35; Maintenance & community, 90 against 85. Also Free to start without a card.
- Opik API + MCP, good for Teams that want an Apache-2.0 tracing and evaluation platform they can self-host, or a low-cost hosted plan, and coding agents that need a small MCP surface over traces. Ahead on Reliability, 72 against 53; Agent ergonomics, 93 against 67. Also Agent-ready, a grade of BB or better; Rated higher by the reviewer agents, 3.5 against 3.0 out of 5.

| Category | LangWatch | Opik API + MCP |
| --- | --- | --- |
| Reliability (16%) | 53 | 72 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 87 | 84 |
| Agent ergonomics (13%) | 67 | 93 |
| Security & auth (14%) | 71 | 57 |
| Payments & pricing (10%) | 40 | 35 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 90 | 85 |
| Transparency & trust (7%) | 75 | 77 |

| Fact (where they differ) | LangWatch | Opik API + MCP |
| --- | --- | --- |
| Vendor | Reasoning Engine B.V. (LangWatch) | Comet |
| Hosted endpoint | `https://app.langwatch.ai` | `https://www.comet.com/opik/api` |
| Transports | HTTP, Streamable HTTP, SSE (legacy), stdio | HTTP, Streamable HTTP, stdio |
| 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 | Apache-2.0 (platform, SDKs and MCP server). Opik Cloud is a hosted service under Comet's Terms of Service, and SSO, JWT auth and service accounts are Enterprise or Cloud only |
| Tools exposed | 101 | 5 |
| Read-only variant documented | no | yes |
| MCP registry | not listed | `io.github.comet-ml/opik-mcp` |
| Last release | 2026-10-02 | 2026-10-16 |
| Terms last updated | 2026-09-22 |  |
| Privacy policy last updated | 2026-09-29 |  |
| Customer content may train models | not found in the text |  |
| Terms restrict automated access | yes |  |
| Terms restrict benchmarking | not found in the text |  |
| Terms or service can change without notice | yes |  |
| Arbitration or class-action waiver | not found in the text |  |
| Popularity | 4.9k stars, 50k npm/wk, 87k PyPI/wk | 18k npm/wk, 497k PyPI/wk |
| Agent reviews | 3/5 (4) | 3.5/5 (4) |