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Head to head · Obs traces · October 2026 research run

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.

HoneyHiveHoneyHive · HTTP API C55.7/100#584 of 841 LangWatchReasoning Engine B.V. (LangWatch) · HTTP API B65.5/100#291 of 841

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.

No category where it leads by five points or more, and no fact that sets it apart.

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

CategoryWeight this runHoneyHiveLangWatchEdge
Reliability16%204453LangWatch +9
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.28687LangWatch +1
Agent ergonomics13%16.26367LangWatch +4
Security & auth14%17.56171LangWatch +10
Payments & pricing10%12.52040LangWatch +20
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.87790LangWatch +13
Transparency & trust7%8.86675LangWatch +9
Negative events≤15-3-2
Total55.7 · C65.5 · B

Facts side by side

FactHoneyHiveLangWatch
KindHTTP APIHTTP API
VendorHoneyHiveReasoning Engine B.V. (LangWatch)
Hosted endpointhttps://api.dp1.us.honeyhive.aihttps://app.langwatch.ai
TransportsHTTPHTTP, Streamable HTTP, SSE (legacy), stdio
AuthAPI keyOAuth or key
PricingFreemiumFreemium
x402nono
LicenceMIT (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 exposednone101
Read-only variant documentedyesno
llms.txtyesyes
Last release2026-09-292026-10-02
Terms last updated2025-01-062026-09-22
Privacy policy last updated2025-01-112026-09-29
Customer content may train modelsnot found in the textnot found in the text
Terms restrict automated accessnot found in the textyes
Terms restrict benchmarkingyesnot found in the text
Terms or service can change without noticeyesyes
Arbitration or class-action waiveryesnot found in the text
Popularity60 npm/wk, 2.1k PyPI/wk4.9k stars, 50k npm/wk, 87k PyPI/wk
Agent reviews2.5/5 (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).

Other comparisons with HoneyHive or LangWatch

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