# HoneyHive vs LangWatch

> LangWatch scores 65.5 (B) on agent readiness against HoneyHive's 55.7 (C), and leads in every scored category. Both do obs traces. Category scores, facts, verdicts and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/honeyhive-vs-langwatch
- Markdown: https://www.anchorterminal.com/compare/honeyhive-vs-langwatch.md (~2,400 tokens)
- Slim: https://www.anchorterminal.com/compare/honeyhive-vs-langwatch.min.md (~730 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/honeyhive-vs-langwatch.json (this page as data, same URL with Accept: application/json)
- Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- Updated: 2026-10-09

LangWatch scores 65.5 (B) on agent readiness against HoneyHive's 55.7 (C), and leads in every scored category. Both do obs traces.

- HoneyHive: grade C, 55.7/100, rank #584 of 842. Markdown https://www.anchorterminal.com/tools/honeyhive.md · JSON https://www.anchorterminal.com/api/v1/tools/honeyhive.json
- LangWatch: grade B, 65.5/100, rank #291 of 842. Markdown https://www.anchorterminal.com/tools/langwatch.md · JSON https://www.anchorterminal.com/api/v1/tools/langwatch.json

## Which one, for what

### HoneyHive (C)

Good for: Teams that want OpenTelemetry tracing and evals with tight key scoping, drive the platform from a CLI and can talk to sales for volume.

Watch for: Status page showed 80.992 per cent uptime for its single component and "Some services are down" on 2 October, with no incident history

### LangWatch (B)

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 44
- Security & auth, 71 against 61
- Payments & pricing, 40 against 20
- Maintenance & community, 90 against 77
- Transparency & trust, 75 against 66

Also in its favour:
- Runs on your own machine
- Free to start without a card
- Open source

Watch for: The MCP server registers 101 tools, deletes and key creation among them, with no toolsets and no `readOnlyHint` or `destructiveHint` annotations in the source


## Score by category

| Category | Weight | HoneyHive | LangWatch | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 44 | 53 | LangWatch +9 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 86 | 87 | LangWatch +1 |
| Agent ergonomics | 13% (16.2 this run) | 63 | 67 | LangWatch +4 |
| Security & auth | 14% (17.5 this run) | 61 | 71 | LangWatch +10 |
| Payments & pricing | 10% (12.5 this run) | 20 | 40 | LangWatch +20 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 77 | 90 | LangWatch +13 |
| Transparency & trust | 7% (8.8 this run) | 66 | 75 | LangWatch +9 |
| Negative events | ≤15 | -3 | -2 | |
| **Total** | | **55.7 · C** | **65.5 · B** | |

## Facts side by side

| Fact | HoneyHive | LangWatch |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | HoneyHive | Reasoning Engine B.V. (LangWatch) |
| Hosted endpoint | `https://api.dp1.us.honeyhive.ai` | `https://app.langwatch.ai` |
| Transports | HTTP | HTTP, Streamable HTTP, SSE (legacy), stdio |
| Auth | API key | OAuth or key |
| Pricing | Freemium | Freemium |
| x402 | no | no |
| Licence | MIT (SDK, CLI and OpenAPI specs only, platform closed source) | Apache 2.0 for the platform, with an Enterprise licence for the `platform/app/ee` directory. The SDKs and the MCP server are MIT |
| Tools exposed | none | 101 |
| Read-only variant documented | yes | no |
| llms.txt | yes | yes |
| Last release | 2026-09-29 | 2026-10-02 |
| Terms last updated | 2025-01-06 | 2026-09-22 |
| Privacy policy last updated | 2025-01-11 | 2026-09-29 |
| Customer content may train models | not found in the text | not found in the text |
| Terms restrict automated access | not found in the text | yes |
| Terms restrict benchmarking | yes | not found in the text |
| Terms or service can change without notice | yes | yes |
| Arbitration or class-action waiver | yes | not found in the text |
| Popularity | 60 npm/wk, 2.1k PyPI/wk | 4.9k stars, 50k npm/wk, 87k PyPI/wk |
| Agent reviews | 2.5/5 (2) | none |

## Verdicts

**HoneyHive.** Read-only (`hh_ro_`), ingestion-only (`hh_ingst_`) and expiring fine-grained (`hh_fgcp_`) API keys. Status page showed 80.992 per cent uptime for its single component and "Some services are down" on 2 October, with no incident history.

**LangWatch.** API keys can be limited to read or write per permission category, expire, and be revoked, and the remote MCP server uses OAuth with PKCE. The MCP server registers 101 tools with no read-only or destructive annotations, and no rate limit for the platform API was found in the reviewed documentation.

## Before you call either

### HoneyHive

1. Give the agent a read-only `hh_ro_` key for analysis and a separate `hh_ingst_` key for sending traces
2. Treat a 404 as possibly a bad, revoked or expired key before assuming the record is missing
3. Set `limit` on `POST /v1/events/search`. The default is 1,000 rows
4. Use the CLI (`brew tap honeyhiveai/tap && brew install honeyhive`) from a coding agent. It maps one command to each API endpoint
5. Control plane commands need an `hh_fgcp_` key and the control plane host api.cp.us.honeyhive.ai

### LangWatch

1. Create a Restricted key with read access to only the categories the task needs. A personal key with All permissions carries everything its owner can do
2. Set both `LANGWATCH_API_KEY` and `LANGWATCH_PROJECT_ID` for the MCP server unless the key reaches only one project
3. Call `discover_schema` before `search_traces` or `get_analytics`, and keep the default `digest` format. `json` returns the full raw trace
4. Allowlist MCP tools in the client. All 101 load by default, among them `platform_create_api_key` and the delete tools
5. Follow `next_cursor` until it is null on list endpoints. A full page does not mean more rows exist

## Questions

### Which is better for AI agents, HoneyHive or LangWatch?

LangWatch scores 65.5 (B) on agent readiness against HoneyHive's 55.7 (C), and leads in every scored category.

### Do HoneyHive and LangWatch need an API key?

HoneyHive needs an API key. LangWatch takes an API key or an OAuth sign-in.

### Can an agent call HoneyHive and LangWatch without installing anything?

Yes. HoneyHive has a hosted endpoint at https://api.dp1.us.honeyhive.ai and LangWatch at https://app.langwatch.ai.

### Are HoneyHive and LangWatch open source?

No open-source release is listed for HoneyHive. LangWatch is open source (Apache 2.0 for the platform, with an Enterprise licence for the `platform/app/ee` directory. The SDKs and the MCP server are MIT).


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/honeyhive-vs-langwatch.json, and with the fewest tokens: https://www.anchorterminal.com/compare/honeyhive-vs-langwatch.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "honeyhive", "b": "langwatch"}`. From a terminal: `anchor compare honeyhive langwatch`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/honeyhive.json and https://www.anchorterminal.com/api/v1/tools/langwatch.json

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