The Best AI Agent Observability Tools in 2026
We researched these products from official websites, including pricing pages, plan tables, and product documentation. Rankings weigh each platform’s core observability job, value for money, and verified features for tracing, monitoring, debugging, and analyzing AI-agent and LLM application runs: AI agent observability tools.
Our top picks
-
Top ranked
Opik#1 of 319.4/10A broad observability toolkit with open-source deployment and a low-cost paid cloud tier.
Free plan
-
Runner-up
Langfuse#2 of 319.2/10A broad observability platform for teams tracing, evaluating, and improving LLM applications.
Free plan
-
Top-ranked free plan
Arize Phoenix#3 of 319.0/10A free, open-source observability platform with broad tracing and evaluation coverage.
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 31 tools, best first
-
Best forTeams wanting broad, low-cost agent observability
A broad observability toolkit with open-source deployment and a low-cost paid cloud tier.
- Cost tracking
9.4/10★★★★★Visit Opik -
Best forTeams needing mature end-to-end LLM tracing
A broad observability platform for teams tracing, evaluating, and improving LLM applications.
- Cost tracking
9.2/10★★★★★Visit Langfuse -
Best forBudget-conscious teams wanting open-source depth
A free, open-source observability platform with broad tracing and evaluation coverage.
- Cost tracking
9.0/10★★★★☆Visit Arize Phoenix -
Best forDevelopers testing complex agent conversations
A broad toolkit for tracing, evaluating, and testing complex AI agent conversations.
- Cost tracking
8.9/10★★★★☆Visit LangWatch -
Best forTeams focused on production agent quality
A broad observability and evaluation suite for teams improving production agent quality.
- Cost tracking
8.8/10★★★★☆Visit HoneyHive -
Best forLangChain-centric teams needing full observability
A full LangChain-centric observability suite with free access and paid scaling options.
- Cost tracking
8.7/10★★★★☆Visit LangSmith -
Best forOrganizations wanting polished agent diagnostics
Broad agent observability with free usage, paid growth, and enterprise deployment options.
- Cost tracking
8.6/10★★★★☆Visit Arize AX -
Best forEstablished teams needing broad evaluation workflows
A broad toolkit for tracing, evaluating, monitoring, and governing AI applications.
- Cost tracking
8.5/10★★★★☆Visit W&B Weave -
Best forAgent teams needing trace search and debugging
A focused observability stack for tracing, evaluating, and debugging AI agents.
- Cost tracking
8.4/10★★★★☆Visit Laminar -
Best forSelf-hosting teams needing maximum feature breadth
A broad self-hosted observability suite for teams building LLM apps and agents.
- Cost tracking
8.3/10★★★★☆Visit OpenLIT -
Best forTeams wanting free, standards-based tracing
A free, open-source observability platform for tracing and evaluating AI applications.
- Prompt and tool tracing
- Session replay
- Cost tracking
8.2/10★★★★☆Visit Traceloop -
Best forTeams needing observability plus an LLM gateway
A broad observability stack with a capable model gateway, but a high paid entry price.
- Cost tracking
8.1/10★★★★☆Visit Helicone -
Best forLarge teams needing gateway and observability depth
A broad observability and gateway platform for teams building LLM agents.
- Cost tracking
8.0/10★★★★☆Visit Respan -
Best forTeams wanting affordable paid tracing
Paid tracing with evaluations, prompt workflows, analytics, and self-hosting.
- Cost tracking
7.9/10★★★★☆Visit Lunary -
Best forTeams focused on agent replay and auditability
A focused observability platform for replay, debugging, audit trails, and cost tracking.
- Cost tracking
7.8/10★★★★☆Visit AgentOps -
Best forOpen-source teams needing foundational tracing
A capable open-source foundation for tracing AI agents, with broad framework support.
- Prompt and tool tracing
- Session replay
- Cost tracking
7.7/10★★★★☆Visit MLflow -
Best forTeams needing safety-focused observability
A safety-oriented observability platform with tracing, evaluations, guardrails, and cost visibility.
- Cost tracking
7.6/10★★★★☆Visit Fiddler AI -
Best forTeams wanting automated root-cause fixes
TraceRoot connects agent tracing, evaluations, and automated root-cause fixes.
- Prompt and tool tracing
- Session replay
- Cost tracking
7.5/10★★★★☆Visit TraceRoot -
Best forTeams needing governance around agent traces
A broad AI agent control plane with useful governance features and a $99 paid entry point.
- Prompt and tool tracing
- Session replay
- Cost tracking
7.4/10★★★★☆Visit Traccia -
Best forTeams needing simple visual trace inspection
A focused visual tracing tool with a free entry plan and narrow listed integrations.
- Prompt and tool tracing
- Session replay
- Cost tracking
7.3/10★★★★☆Visit VoltOps -
Best forTeams centered on evaluation and agent simulation
A strong fit for agent simulation and evaluation, with production monitoring and CI/CD workflows.
7.2/10★★★★☆Visit Maxim AI -
Best forEvaluation-led teams with larger budgets
Broad evaluation and tracing coverage, with a high starting price for paid use.
7.1/10★★★★☆Visit Braintrust -
Best forTeams prioritizing safety and regression testing
A safety-focused observability platform with deep evaluation and regression controls.
7.0/10★★★★☆Visit Galileo -
Best forTeams needing security-aware trace analysis
A security-aware observability platform with tracing, evaluations, cost controls, and scanning.
- Prompt and tool tracing
- Session replay
- Cost tracking
6.9/10★★★☆☆Visit LogicGaze -
Best forTeams prioritizing prompt operations and testing
A prompt-operations workspace with testing, evaluations, tracing, and multi-provider support.
6.8/10★★★☆☆Visit Agenta -
Best forGoverned agent fleet operators
A cloud runtime for tracing, governing, and costing production agent fleets.
- Session replay
- Cost tracking
6.7/10★★★☆☆Visit Hexel -
Best forEnterprises needing provider-neutral agent traces
Provider-neutral observability for enterprise AI agents, with deep tracing and custom pricing.
- Prompt and tool tracing
- Session replay
- Cost tracking
6.6/10★★★☆☆Visit Kosmoy -
Best forTeams combining AI traces with general monitoring
A broad observability platform for teams pairing AI traces with application monitoring.
6.5/10★★★☆☆Visit SigNoz -
Best forInfrastructure teams adding basic trace exploration
A managed observability platform for teams adding core telemetry exploration.
6.4/10★★★☆☆Visit Observe -
Best forSelf-hosting developers needing trace replay
An open-source trace, replay, and cost-analysis tool for self-hosted agent teams.
- Prompt and tool tracing
- Session replay
- Cost tracking
6.3/10★★★☆☆Visit PetalTrace -
Best forMultimodal document and media extraction workflows
A usage-priced API for extracting and analyzing documents, images, video, and audio.
6.0/10★★★☆☆Visit AWS
No tools match those filters.
Compare at a glance
| # | Tool | Free plan | Paid from | Score |
|---|---|---|---|---|
| 1 | Opik | Yes | $19/mo | 9.4 |
| 2 | Langfuse | Yes | $29/mo | 9.2 |
| 3 | Arize Phoenix | Yes | Free | 9.0 |
| 4 | LangWatch | Yes | €29/seat/mo | 8.9 |
| 5 | HoneyHive | Yes | 8.8 | |
| 6 | LangSmith | Yes | $39/seat/mo | 8.7 |
| 7 | Arize AX | Yes | $50/mo | 8.6 |
| 8 | W&B Weave | Yes | $60/mo | 8.5 |
| 9 | Laminar | Yes | $30/mo | 8.4 |
| 10 | OpenLIT | Yes | Free | 8.3 |
| 11 | Traceloop | Yes | 8.2 | |
| 12 | Helicone | Yes | $79/mo | 8.1 |
| 13 | Respan (formerly Keywords AI) | Yes | $199/mo | 8.0 |
| 14 | Lunary | No | $20/user/mo | 7.9 |
| 15 | AgentOps | Yes | $40/mo | 7.8 |
| 16 | MLflow Tracing | Yes | Free | 7.7 |
| 17 | Fiddler AI | Yes | $0.002/unit usage-based | 7.6 |
| 18 | TraceRoot | Yes | 7.5 | |
| 19 | Traccia | Yes | $99/mo | 7.4 |
| 20 | VoltOps | Yes | $50/mo | 7.3 |
| 21 | Maxim AI | Yes | 7.2 | |
| 22 | Braintrust | Yes | $249/mo | 7.1 |
| 23 | Galileo | Yes | $100/mo | 7.0 |
| 24 | LogicGaze | Yes | Free | 6.9 |
| 25 | Agenta | Yes | $29/mo | 6.8 |
| 26 | Hexel | Yes | 6.7 | |
| 27 | Kosmoy AI Observability | No | 6.6 | |
| 28 | SigNoz | Yes | $49/mo | 6.5 |
| 29 | Observe | No | 6.4 | |
| 30 | PetalTrace | Free | 6.3 | |
| 31 | Amazon Bedrock Data Automation | $0.005/unit usage-based | 6.0 |
Head-to-head All 7 comparisons →
- Opik vs HoneyHive
- Langfuse vs HoneyHive
- Arize Phoenix vs HoneyHive
- LangWatch vs HoneyHive
- HoneyHive vs LangSmith
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How we rank AI agent observability tools
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