Best Fiddler AI Alternatives in 2026
The top Fiddler AI alternatives are Arize AX, Langfuse and Arize Phoenix: 15 LLM observability tools our editors would look at instead of Fiddler AI, in our ranking order.
Fiddler AI: A governance-focused observability platform for LLMs, agents, retrieval, and predictive models. Where it falls short: platform access is limited to web and API.
Switching from Fiddler AI? For most llm observability tools buyers the best Fiddler AI alternative is Arize AX, built for teams wanting broad, production-ready LLM observability. On a budget, Opik starts at $19/mo.
Why People Look for a Fiddler AI Alternative
- Platform access is limited to web and API
- Developer pricing is based on trace usage rather than a fixed fee
- Broader capabilities may exceed the needs of teams seeking basic tracing
Quick Picks by What You Need
- Best overallArize AX9.4
Teams wanting broad, production-ready LLM observability
Visit Arize AX - Lowest priceOpik9.1
Paid plans from $19/mo
Visit Opik - Best free optionArize AX9.4
Has a free plan
Visit Arize AX
All 15 Fiddler AI 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 wanting broad, production-ready LLM observability
- Better than Fiddler AI:
- Editor score 9.4 vs 8.5
Broad LLM observability with tracing, evaluations, prompts, agents, RAG, and cost tracking.
- LLM evaluations
- Prompt management
- Retrieval tracing
9.4/10★★★★★Visit Arize AX -
Best forTeams seeking balanced open-source observability
- Better than Fiddler AI:
- Editor score 9.3 vs 8.5
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
- Better than Fiddler AI:
- Editor score 9.2 vs 8.5
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 Fiddler AI:
- Editor score 9.1 vs 8.5
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
- Better than Fiddler AI:
- Editor score 9.0 vs 8.5
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 Fiddler AI:
- Editor score 8.9 vs 8.5
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
- Better than Fiddler AI:
- Editor score 8.8 vs 8.5
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 Fiddler AI:
- Editor score 8.7 vs 8.5
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
- Better than Fiddler AI:
- Editor score 8.6 vs 8.5
A broad LLM monitoring stack with gateway, tracing, evaluations, and self-hosting.
- LLM evaluations
- Prompt management
- Retrieval tracing
8.6/10★★★★☆Visit Helicone -
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
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
Fiddler AI Alternatives: Common Questions
What is the best alternative to Fiddler AI?
Arize AX: #1 in our LLM Observability Tools ranking, with an editor score of 9.4 out of 10. Broad LLM observability with tracing, evaluations, prompts, agents, RAG, and cost tracking.
Is there a free alternative to Fiddler AI?
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 Fiddler AI?
Of the alternatives here that publish a price, Opik starts lowest, at $19/mo.
Why do people look for Fiddler AI alternatives?
Platform access is limited to web and API; Developer pricing is based on trace usage rather than a fixed fee; Broader capabilities may exceed the needs of teams seeking basic tracing.
How do I switch from Fiddler AI?
Export your data from Fiddler AI (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 Fiddler AI.
How to Switch from Fiddler AI
- Export your data from Fiddler AI (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 Fiddler AI.
Fiddler AI vs Each Alternative
| # | Tool | Free plan | Paid from | LLM tracing | LLM evaluations | Prompt management | Agent tracing | Retrieval tracing | Deployment options | Score |
|---|---|---|---|---|---|---|---|---|---|---|
| 10 | Fiddler AI | Yes | $0.002/unit usage-based | Yes | Yes | Yes | Yes | Yes | Both | 8.5 |
| 1 | Arize AX | Yes | $50/mo | Yes | Yes | Yes | Yes | Yes | Both | 9.4 |
| 2 | Langfuse | Yes | $29/mo | Yes | Yes | Yes | Yes | Yes | Both | 9.3 |
| 3 | Arize Phoenix | Yes | Free | Yes | Yes | Yes | Yes | Yes | Both | 9.2 |
| 4 | Opik | Yes | $19/mo | Yes | Yes | Yes | Yes | Yes | Both | 9.1 |
| 5 | W&B Weave | Yes | $60/mo | Yes | Yes | Yes | Yes | Yes | Both | 9.0 |
| 6 | LangSmith | Yes | $39/seat/mo | Yes | Yes | Yes | Yes | Yes | Both | 8.9 |
| 7 | LangWatch | Yes | €29/seat/mo | Yes | Yes | Yes | Yes | Yes | Both | 8.8 |
| 8 | Laminar | Yes | $30/mo | Yes | Yes | Yes | Yes | Yes | Both | 8.7 |
| 9 | Helicone | Yes | $79/mo | Yes | Yes | Yes | Yes | Yes | Both | 8.6 |
| 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 |
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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