Best Arize AX Alternatives in 2026
The top Arize AX alternatives are Langfuse, Arize Phoenix and Opik: 15 LLM observability tools our editors would look at instead of Arize AX, in our ranking order.
Arize AX: Broad LLM observability with tracing, evaluations, prompts, agents, RAG, and cost tracking. Where it falls short: free plan limits usage to 10 signal issues per month.
Switching from Arize AX? For most llm observability tools buyers the best Arize AX alternative is Langfuse, built for teams seeking balanced open-source observability. On a budget, Opik starts at $19/mo, against $50/mo for Arize AX.
Why People Look for an Arize AX Alternative
- Free plan limits usage to 10 Signal issues per month
- Enterprise pricing is custom
- Self-hosted deployment is available only on Enterprise
- Paid from $50/mo — Opik is $19/mo
Quick Picks by What You Need
- Best overallLangfuse9.3
Teams seeking balanced open-source observability
Visit Langfuse - Lowest priceOpik9.1
Paid plans from $19/mo
Visit Opik - Best free optionLangfuse9.3
Has a free plan
Visit Langfuse
All 15 Arize AX Alternatives, Ranked
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.
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Best forTeams seeking balanced open-source observability
- Better than Arize AX:
- Paid from: $29/mo vs $50/mo
A broad observability platform with open-source deployment and accessible paid tiers.
- LLM evaluations
- Prompt management
- Retrieval tracing
9.3/10★★★★★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
9.2/10★★★★★Visit Arize Phoenix -
Best forCost-conscious teams needing full-stack observability
- Better than Arize AX:
- Paid from: $19/mo vs $50/mo
A broad, cost-conscious stack for tracing, evaluation, prompts, monitoring, and agent debugging.
- LLM evaluations
- Prompt management
- Retrieval tracing
9.1/10★★★★★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
9.0/10★★★★☆Visit W&B Weave -
Best forLangChain-centric teams needing an integrated platform
- Better than Arize AX:
- Paid from: $39/mo vs $50/mo
A broad LLM observability platform with especially strong LangChain ecosystem fit.
- LLM evaluations
- Prompt management
- Retrieval tracing
8.9/10★★★★☆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
8.8/10★★★★☆Visit LangWatch -
Best forDevelopers focused on deep trace investigation
- Better than Arize AX:
- Paid from: $30/mo vs $50/mo
A broad observability platform for tracing agents, costs, failures, and evaluations.
- LLM evaluations
- Prompt management
- Retrieval tracing
8.7/10★★★★☆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
8.6/10★★★★☆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
8.5/10★★★★☆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
8.4/10★★★★☆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
8.3/10★★★★☆Visit HoneyHive -
Best forAgent teams needing replay and audit visibility
- Better than Arize AX:
- Paid from: $40/mo vs $50/mo
A focused observability platform for replay, debugging, cost tracking, and audit visibility.
- Retrieval tracing
- Token cost tracking
- LLM tracing
8.2/10★★★★☆Visit AgentOps -
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
8.1/10★★★★☆Visit Evidently AI -
Best forEvaluation-led teams needing production observability
A broad evaluation and tracing platform for teams operating LLM and agent workflows.
8.0/10★★★★☆Visit Galileo -
Best forLarge teams centered on evaluation workflows
A strong evaluation-led observability platform, with higher paid-plan costs.
7.9/10★★★★☆Visit Braintrust
Arize AX Alternatives: Common Questions
What is the best alternative to Arize AX?
Langfuse: #2 in our LLM Observability Tools ranking, with an editor score of 9.3 out of 10. A broad observability platform with open-source deployment and accessible paid tiers.
Is there a free alternative to Arize AX?
Yes. Langfuse, Arize Phoenix, Opik, W&B Weave and LangSmith have a free plan or a free tier (15 of the 15 alternatives on this page).
What is the cheapest paid alternative to Arize AX?
Of the alternatives here that publish a price, Opik starts lowest, at $19/mo.
Why do people look for Arize AX alternatives?
Free plan limits usage to 10 Signal issues per month; Enterprise pricing is custom; Self-hosted deployment is available only on Enterprise.
How do I switch from Arize AX?
Export your data from Arize AX (most tools have an export in their settings). Sign up for the alternative; start on its free plan or trial if it has one. Import your export and set up the integrations your team relies on. Run both side by side for a short while, then cancel Arize AX.
How to Switch from Arize AX
- Export your data from Arize AX (most tools have an export in their settings).
- Sign up for the alternative; start on its free plan or trial if it has one.
- Import your export and set up the integrations your team relies on.
- Run both side by side for a short while, then cancel Arize AX.
Arize AX vs Each Alternative
| # | Tool | Free plan | Paid from | LLM tracing | LLM evaluations | Prompt management | Agent tracing | Retrieval tracing | Deployment options | Score |
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Arize AX | Yes | $50/mo | Yes | Yes | Yes | Yes | Yes | Both | 9.4 |
| 1 | Langfuse | Yes | $29/mo | Yes | Yes | Yes | Yes | Yes | Both | 9.3 |
| 2 | Arize Phoenix | Yes | Free | Yes | Yes | Yes | Yes | Yes | Both | 9.2 |
| 3 | Opik | Yes | $19/mo | Yes | Yes | Yes | Yes | Yes | Both | 9.1 |
| 4 | W&B Weave | Yes | $60/mo | Yes | Yes | Yes | Yes | Yes | Both | 9.0 |
| 5 | LangSmith | Yes | $39/seat/mo | Yes | Yes | Yes | Yes | Yes | Both | 8.9 |
| 6 | LangWatch | Yes | €29/seat/mo | Yes | Yes | Yes | Yes | Yes | Both | 8.8 |
| 7 | Laminar | Yes | $30/mo | Yes | Yes | Yes | Yes | Yes | Both | 8.7 |
| 8 | Helicone | Yes | $79/mo | Yes | Yes | Yes | Yes | Yes | Both | 8.6 |
| 9 | Fiddler AI | Yes | $0.002/unit usage-based | Yes | Yes | Yes | Yes | Yes | Both | 8.5 |
| 10 | OpenLIT | Yes | Free | Yes | Yes | Yes | Yes | Yes | Self_hosted | 8.4 |
| 11 | HoneyHive | Yes | Yes | Yes | Yes | Yes | Yes | Both | 8.3 | |
| 12 | AgentOps | Yes | $40/mo | Yes | Yes | Yes | Both | 8.2 | ||
| 13 | Evidently AI | Yes | Free | Yes | Yes | Yes | Yes | Both | 8.1 | |
| 14 | Galileo | Yes | $100/mo | Both | 8.0 | |||||
| 15 | Braintrust | Yes | $249/mo | Both | 7.9 |
Head-to-Head
- Arize AX vs Langfuse
- Arize AX vs Arize Phoenix
- Arize AX vs Opik
- Arize AX vs W&B Weave
- Arize AX vs LangSmith
- Arize AX vs LangWatch
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Last updated · How we research and update