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Opinionated picks for agents
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📊Observability & Eval

Tracing, logging, eval harnesses, prompt analytics, and cost monitoring for LLM/agent apps.

Machine board /api/leaderboards?category=observability. Editorial 0–10, not Arena Elo. Alternatives for the current top row: /alternatives/langfuse.

Langfuse

Depot default observability for most agent teams: open, affordable, good enough to serious.

8.7
osstracingevalseu

OpenAI Moderation

Default first-pass content filter for agent I/O. Pair with Llama Guard (Groq) or NeMo Guardrails when you…

8.6
moderationsafetyfreepolicy

Sentry

Depot pick for agent-error-observability (exceptions/traces in the app hosting the agent). Keep…

8.6
errorstracingapmmcp

Arize Phoenix

Choose Phoenix when you want open-source observability you can own. Cloud Arize when enterprise wants a…

8.4
osstracingevalsotel

GrowthBook

OSS/commercial peer to LaunchDarkly/Statsig for progressive agent rollout. GrowthBook when you want…

8.4
feature-flagsexperimentationossrollout

Unleash

Flags-first OSS peer. Prefer for kill-switches and audited rollouts; GrowthBook when experiments are the…

8.4
feature-flagsossrollouteu

Full ranking

#ProviderOverallFit$/perfLatencyDXAs of
1Langfuse8.78.89.28.48.82026-09-14
2OpenAI Moderation8.68.29.89.29.42026-09-14
3Sentry8.68.88.49.09.02026-09-14
4Arize Phoenix8.48.69.08.28.02026-09-14
5GrowthBook8.48.69.08.28.82026-09-14
6Unleash8.48.87.88.88.62026-09-14
7Promptfoo8.48.29.27.88.82026-10-19
8Vantage8.48.69.08.68.82026-09-14
9Hookdeck8.48.88.29.08.82026-09-14
10Cloudflare AI Gateway8.48.09.49.08.22026-09-14
11PostHog8.48.48.88.49.02026-09-14
12ClickHouse Cloud8.49.08.08.88.42026-10-19
13Ragas8.38.09.57.58.22026-09-14
14Statsig8.38.68.88.68.82026-09-14
15Pydantic Logfire8.38.48.68.29.22026-09-14
16Portkey8.38.88.28.69.02026-09-14
17Braintrust8.29.27.58.68.82026-10-19
18Lakera Guard8.28.87.88.49.02026-09-14
19Flagsmith8.28.08.68.28.42026-09-14
20Vercel AI Gateway8.28.29.08.69.22026-09-14
21LaunchDarkly8.29.06.89.28.62026-09-14
22Guardrails AI8.28.48.87.88.22026-09-14
23Helicone8.18.28.58.48.82026-10-19
24Honeycomb8.18.57.09.28.52026-09-14
25LangSmith8.19.07.08.89.02026-09-14
26LangWatch8.18.48.08.08.62026-09-14
27Elasticsearch Serverless8.19.06.89.07.62026-09-14
28Weights & Biases8.08.86.89.08.22026-09-14
29Comet Opik8.08.28.58.08.42026-09-14
30HoneyHive8.08.47.88.08.62026-09-14
31Confident AI8.08.67.88.09.02026-09-14
32Arthur AI7.98.28.08.08.22026-09-14
33NVIDIA NeMo Guardrails7.98.87.58.07.02026-09-14
34CloudZero7.78.86.28.67.52026-09-14
35LangGraph Platform / LangSmith Deploy7.58.46.88.08.22026-09-14
36Maxim AI7.58.07.27.88.02026-09-14
37Galileo7.58.46.28.07.82026-09-14
38Athina AI7.48.06.87.68.22026-09-14
39Patronus AI7.38.45.58.07.22026-09-14
40Palo Alto Prisma AIRS (ex-Protect AI)7.38.65.08.86.22026-09-14
41Cisco AI Defense (ex-Robust Intelligence)7.18.44.88.66.02026-09-14
42HiddenLayer6.98.44.08.26.02026-09-14

Sunset / deprecated