Best Lunary Alternatives in 2026
15 LLM observability tools our editors would look at instead of Lunary, in our ranking order.
Lunary: Affordable paid observability for small teams building and monitoring LLM applications. Where it falls short: new cloud workspaces start at $20 per user monthly.
Advertiser disclosure: iTechGuides is reader-supported. We may earn a commission when you click some links. Scores and reviews are set by our editors and never change for payment; paid placements are marked Featured. How we rank.
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Best forTeams wanting broad, production-ready LLM observability
Broad LLM observability with tracing, evaluations, prompts, agents, RAG, and cost tracking.
- LLM evaluations
- Prompt management
- Retrieval tracing
9.0/10★★★★☆Visit Arize AX -
Best forTeams seeking balanced open-source observability
A broad observability platform with open-source deployment and accessible paid tiers.
- LLM evaluations
- Prompt management
- Retrieval tracing
9.0/10★★★★☆Visit Langfuse -
Best forDevelopers wanting free open-source LLM observability
A free platform for tracing, evaluating, and improving LLM applications.
- LLM evaluations
- Prompt management
- Retrieval tracing
9.0/10★★★★☆Visit Arize Phoenix -
Best forCost-conscious teams needing full-stack observability
A broad, cost-conscious stack for tracing, evaluation, prompts, monitoring, and agent debugging.
- LLM evaluations
- Prompt management
- Retrieval tracing
9.0/10★★★★☆Visit Opik -
Best forGrowing teams wanting mature, broad observability
A broad observability suite for teams tracing, evaluating, and monitoring LLM applications.
- LLM evaluations
- Prompt management
- Retrieval tracing
10.0/10★★★★★Visit W&B Weave -
Best forLangChain-centric teams needing an integrated platform
A broad LLM observability platform with especially strong LangChain ecosystem fit.
- LLM evaluations
- Prompt management
- Retrieval tracing
9.0/10★★★★☆Visit LangSmith -
Best forTeams needing affordable agent and RAG visibility
Affordable visibility for agents, RAG pipelines, evaluations, and LLM costs.
- LLM evaluations
- Prompt management
- Retrieval tracing
9.0/10★★★★☆Visit LangWatch -
Best forDevelopers focused on deep trace investigation
A broad observability platform for tracing agents, costs, failures, and evaluations.
- LLM evaluations
- Prompt management
- Retrieval tracing
9.0/10★★★★☆Visit Laminar -
Best forTeams wanting observability plus an LLM gateway
A broad LLM monitoring stack with gateway, tracing, evaluations, and self-hosting.
- LLM evaluations
- Prompt management
- Retrieval tracing
10.0/10★★★★★Visit Helicone -
Best forOrganizations prioritizing guardrails and governance
A governance-focused observability platform for LLMs, agents, retrieval, and predictive models.
- LLM evaluations
- Prompt management
- Retrieval tracing
9.0/10★★★★☆Visit Fiddler AI -
Best forSelf-hosting teams needing broad infrastructure visibility
A broad observability stack for teams comfortable running AI infrastructure themselves.
- LLM evaluations
- Prompt management
- Retrieval tracing
9.0/10★★★★☆Visit OpenLIT -
Best forTeams wanting extensive agent-framework coverage
A broad observability and evaluation suite for teams building LLM agents.
- LLM evaluations
- Prompt management
- Retrieval tracing
8.0/10★★★★☆Visit HoneyHive -
Best forAgent teams needing replay and audit visibility
A focused observability platform for replay, debugging, cost tracking, and audit visibility.
- Retrieval tracing
- Token cost tracking
- LLM tracing
7.7/10★★★★☆Visit AgentOps -
Evidently AI not yet scored
Best forOpen-source teams focused on evaluation and monitoring
A broad open-source toolkit for evaluating, tracing, and monitoring LLM applications.
- LLM evaluations
- Prompt management
- LLM tracing
—not yet scoredVisit Evidently AI -
Best forEvaluation-led teams needing production observability
A broad evaluation and tracing platform for teams operating LLM and agent workflows.
5.0/10★★☆☆☆Visit Galileo
Lunary Alternatives: Common Questions
What is the best alternative to Lunary?
Arize AX: #1 in our LLM Observability Tools ranking, with an editor score of 9.0 out of 10. Broad LLM observability with tracing, evaluations, prompts, agents, RAG, and cost tracking.
Is there a free alternative to Lunary?
Yes. Arize AX, Langfuse, Arize Phoenix, Opik and W&B Weave have a free plan or a free tier (15 of the 15 alternatives on this page).
What is the cheapest paid alternative to Lunary?
Of the alternatives here that publish a price, Opik starts lowest, at $19/mo.
Lunary vs Each Alternative
| # | Tool | Free plan | Paid from | LLM tracing | LLM evaluations | Prompt management | Agent tracing | Retrieval tracing | Deployment options | Score |
|---|---|---|---|---|---|---|---|---|---|---|
| 18 | Lunary | No | — | Yes | Yes | Yes | Yes | — | Both | 7.3 |
| 1 | Arize AX | Yes | $50/mo | Yes | Yes | Yes | Yes | Yes | Both | 9.0 |
| 2 | Langfuse | Yes | $29/mo | Yes | Yes | Yes | Yes | Yes | Both | 9.0 |
| 3 | Arize Phoenix | Yes | None | Yes | Yes | Yes | Yes | Yes | Both | 9.0 |
| 4 | Opik | Yes | $19/mo | Yes | Yes | Yes | Yes | Yes | Both | 9.0 |
| 5 | W&B Weave | Yes | $60/mo | Yes | Yes | Yes | Yes | Yes | Both | 10.0 |
| 6 | LangSmith | Yes | — | Yes | Yes | Yes | Yes | Yes | Both | 9.0 |
| 7 | LangWatch | Yes | — | Yes | Yes | Yes | Yes | Yes | Both | 9.0 |
| 8 | Laminar | Yes | $30/mo | Yes | Yes | Yes | Yes | Yes | Both | 9.0 |
| 9 | Helicone | Yes | $79/mo | Yes | Yes | Yes | Yes | Yes | Both | 10.0 |
| 10 | Fiddler AI | Yes | — | Yes | Yes | Yes | Yes | Yes | Both | 9.0 |
| 11 | OpenLIT | Yes | None | Yes | Yes | Yes | Yes | Yes | Self_hosted | 9.0 |
| 12 | HoneyHive | Yes | — | Yes | Yes | Yes | Yes | Yes | Both | 8.0 |
| 13 | AgentOps | Yes | $40/mo | Yes | — | — | Yes | Yes | Both | 7.7 |
| not scored | Evidently AI | Yes | None | Yes | Yes | Yes | Yes | — | Both | — |
| 15 | Galileo | Yes | $100/mo | — | — | — | — | — | Both | 5.0 |
Reviewed by iTechGuides Editors · Editorial team · Updated Sep 2026