The Best Llm Monitoring in 2026
We researched LLM monitoring products using information on their official websites, including pricing pages, plan tables, and product documentation. Rankings focus on the category’s core job, value for money, and features verified in vendor materials. Compare tools for tracing, evaluation, quality, safety, latency, and cost monitoring for LLM applications.
Our top picks
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Top ranked
LangSmith#1 of 269.3/10Broad LLM tracing and evaluation, with cloud, hybrid, and self-hosted options.
Free plan
-
Runner-up
Datadog LLM Observability#2 of 269.1/10LLM tracing and evaluation with Datadog context, plus a free plan and cloud-only deployment.
Free plan
-
Top-ranked free plan
Langfuse#3 of 268.9/10Trace LLMs, agents, retrieval, evaluations, prompts, and costs in cloud or self-hosted deployments.
Free plan
Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.
The full ranking 26 tools, best first
-
Best forTeams building and monitoring LLM applications and agents
Broad LLM tracing and evaluation, with cloud, hybrid, and self-hosted options.
- Evaluation support
- LLM tracing
9.3/10★★★★★Visit LangSmith -
Best forTeams already using Datadog
LLM tracing and evaluation with Datadog context, plus a free plan and cloud-only deployment.
- Alerts
- Evaluation support
- LLM tracing
9.1/10★★★★★Visit Datadog -
Best forTeams seeking open-source, full-stack observability
Trace LLMs, agents, retrieval, evaluations, prompts, and costs in cloud or self-hosted deployments.
- Evaluation support
- LLM tracing
8.9/10★★★★☆Visit Langfuse -
Best forTeams needing RAG diagnostics and agent evaluations
A broad monitoring toolkit with RAG diagnostics, agent evaluations, and a free tier.
- Evaluation support
- LLM tracing
8.8/10★★★★☆Visit Arize AX -
Best forTeams monitoring LLM apps and agent behavior
Trace LLM apps and agents, evaluate outputs, and monitor cost and safety signals.
- Evaluation support
- LLM tracing
Free plan · 30-day trial Our W&B Weave verdict → Visit W&B WeaveFor vendors Sponsor this spot · #5 · $59/mo →8.7/10★★★★☆Visit W&B Weave -
Best forTeams prioritizing open-source tracing and evaluation
Trace and evaluate LLM applications in the cloud or on your own infrastructure.
- Evaluation support
- LLM tracing
8.6/10★★★★☆Visit Opik -
Best forTeams wanting free, self-hosted LLM observability
A free, self-hostable stack for tracing, evaluating, and iterating on LLM applications.
- Evaluation support
- LLM tracing
8.5/10★★★★☆Visit Arize Phoenix -
Best forTeams needing a model gateway with observability
A model gateway paired with tracing, prompt workflows, evaluations, and cost analytics.
- Evaluation support
- LLM tracing
8.4/10★★★★☆Visit Helicone -
Best forTeams focused on evaluation-led production quality
A quality-focused platform linking LLM evaluations, production traces, and regression gates.
8.3/10★★★★☆Visit Braintrust -
Best forTeams needing safety checks and CI/CD evaluation gates
Galileo pairs production tracing with safety evaluations, guardrails, and CI/CD gates.
8.2/10★★★★☆Visit Galileo -
Best forTeams needing drift alerts and CI/CD evaluation
Trace, evaluate, and monitor LLM applications and agents across development and production.
- Evaluation support
- LLM tracing
8.1/10★★★★☆Visit HoneyHive -
Best forTeams needing simulation and OpenTelemetry-native traces
A broad monitoring toolkit for teams that need simulation and OpenTelemetry-native traces.
- Evaluation support
- LLM tracing
8.0/10★★★★☆Visit LangWatch -
Best forTeams prioritizing routing, fallbacks, and analytics
Routing, fallbacks, and request analytics are central to Portkey’s LLM gateway.
7.9/10★★★★☆Visit Portkey -
Best forTeams debugging agent runs with searchable traces
Searchable traces, failure signals, and evaluations for debugging agent runs.
- Evaluation support
- LLM tracing
7.8/10★★★★☆Visit Laminar -
Best forTeams wanting free tracing with vector database visibility
Free tracing spans LLMs, agents, sessions, and vector databases.
7.7/10★★★★☆Visit Traceloop -
Best forTeams building on MLflow who self-host
Open-source tracing and quality evaluation for teams running LLM apps on MLflow.
- Alerts
- Evaluation support
- LLM tracing
7.6/10★★★★☆Visit MLflow -
Best forSelf-hosters needing LLM and GPU observability
Broad LLM and GPU observability for teams prepared to self-host.
- Evaluation support
- LLM tracing
7.5/10★★★★☆Visit OpenLIT -
Best forTeams focused on multi-agent replay and auditing
A focused monitoring platform for replaying, debugging, and auditing multi-agent sessions.
- LLM tracing
7.4/10★★★★☆Visit AgentOps -
Best forTeams centering monitoring on prompt iteration
Prompt versioning, evaluations, and run tracing make Agenta a fit for prompt-centered teams.
7.3/10★★★★☆Visit Agenta -
Best forSelf-hosters evaluating agents, RAG and safety
A self-hosted toolkit for tracing, evaluating and comparing LLM application quality.
7.2/10★★★★☆Visit TruLens -
Best forTeams evaluating production logs and model performance
LLM tracing and evaluation analytics for teams operating production workloads.
- Alerts
- Evaluation support
- LLM tracing
7.1/10★★★★☆Visit Athina -
Best forTeams wanting straightforward LLM request monitoring
A focused LLM observability tool for tracing requests, spend, performance, and prompts.
- Alerts
- Evaluation support
- LLM tracing
7.0/10★★★★☆Visit Atatus -
Best forTeams emphasizing evaluation over ongoing observability
A flexible evaluation toolkit for agent teams, with more emphasis on testing than live observability.
6.9/10★★★☆☆Visit Future AGI -
Best forTeams extending infrastructure observability to LLMs
A general observability platform that extends infrastructure monitoring to LLM workloads.
6.8/10★★★☆☆Visit Observe -
Best forSelf-hosting teams monitoring gateway costs and reliability
Gateway-level telemetry for teams tracking LLM costs, routing, and reliability.
- Alerts
- LLM tracing
6.7/10★★★☆☆Visit Bifrost -
Best forSmall self-hosted workloads needing lightweight drift checks
A focused self-hosted toolkit for tracing LLM calls and checking for quality drift.
- Evaluation support
- LLM tracing
6.6/10★★★☆☆Visit site
No tools match those filters.
Compare at a glance
| # | Tool | Free plan | Paid from | LLM tracing | Evaluation support | Deployment options | Score |
|---|---|---|---|---|---|---|---|
| 1 | LangSmith | Yes | $39/seat/mo | Yes | Yes | Both | 9.3 |
| 2 | Datadog LLM Observability | Yes | $160/mo | Yes | Yes | Cloud | 9.1 |
| 3 | Langfuse | Yes | $29/mo | Yes | Yes | Both | 8.9 |
| 4 | Arize AX | Yes | $50/mo | Yes | Yes | Both | 8.8 |
| 5 | W&B Weave | Yes | $60/mo | Yes | Yes | Both | 8.7 |
| 6 | Opik | Yes | $19/mo | Yes | Yes | Both | 8.6 |
| 7 | Arize Phoenix | Yes | Free | Yes | Yes | Both | 8.5 |
| 8 | Helicone | Yes | $79/mo | Yes | Yes | Both | 8.4 |
| 9 | Braintrust | Yes | $249/mo | Both | 8.3 | ||
| 10 | Galileo | Yes | $100/mo | Both | 8.2 | ||
| 11 | HoneyHive | Yes | Yes | Yes | Both | 8.1 | |
| 12 | LangWatch | Yes | €29/seat/mo | Yes | Yes | Both | 8.0 |
| 13 | Portkey | Yes | 7.9 | ||||
| 14 | Laminar | Yes | $30/mo | Yes | Yes | Both | 7.8 |
| 15 | Traceloop | Yes | 7.7 | ||||
| 16 | MLflow AI Monitoring | Yes | Free | Yes | Yes | Self_hosted | 7.6 |
| 17 | OpenLIT | Yes | Free | Yes | Yes | Self_hosted | 7.5 |
| 18 | AgentOps | Yes | $40/mo | Yes | Both | 7.4 | |
| 19 | Agenta | Yes | $29/mo | 7.3 | |||
| 20 | TruLens | Free | 7.2 | ||||
| 21 | Athina | Yes | Yes | Yes | Both | 7.1 | |
| 22 | Atatus LLM Observability | No | Yes | Yes | Both | 7.0 | |
| 23 | Future AGI AI Evaluation SDK | Yes | $250/mo | 6.9 | |||
| 24 | Observe | No | 6.8 | ||||
| 25 | Bifrost AI Observability | Yes | Yes | No | Self_hosted | 6.7 | |
| 26 | Cognifity Verdict | Yes | Free | Yes | Yes | Self_hosted | 6.6 |
Head-to-head All 13 comparisons →
- LangSmith vs Datadog LLM Observability
- LangSmith vs Helicone
- Datadog LLM Observability vs Langfuse
- Datadog LLM Observability vs Arize AX
- Datadog LLM Observability vs W&B Weave
- Datadog LLM Observability vs Opik
- Datadog LLM Observability vs Arize Phoenix
- Datadog LLM Observability vs Helicone
- Langfuse vs Helicone
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How we rank llm monitoring
Every tool on this page was researched by iTechGuides Editors from its official website — pricing pages, plan tables and product documentation. We rank on how well each one does this category's core job, what the free or entry plan includes, and where it falls short. Where we have enough verified facts, the score out of 10 is a rubric — job fit, value and how much we could verify — shown with its breakdown on every tool's page; a tool we have not verified enough to score yet shows its rank without a number. Scores are re-checked when a product changes its plans. Read the full editorial policy, or submit a tool we missed.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Last updated · How we research and update