The Best Model Monitoring Software in 2026
We researched model monitoring software from official websites, including pricing pages, plan tables and product documentation. Products are ranked on coverage of the category’s core job, value for money and verified features, helping teams compare tools for monitoring deployed models in production.
Our top picks
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Top ranked
Arize AX#1 of 249.4/10Broad monitoring for LLMs and agents, with tracing, evaluations, and cost visibility.
Free plan
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Runner-up
Arize Phoenix#2 of 249.3/10A free Phoenix platform for tracing, evaluating, and improving LLM applications.
Free plan
-
Top-ranked free plan
W&B Weave#3 of 249.1/10A mature monitoring platform for teams operating complex LLM applications and agents.
Free plan · 30-day trial
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 24 tools, best first
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Best forBroad LLM and agent monitoring teams
Broad monitoring for LLMs and agents, with tracing, evaluations, and cost visibility.
9.4/10★★★★★Visit Arize AX -
Best forTeams wanting open-source LLM monitoring
A free Phoenix platform for tracing, evaluating, and improving LLM applications.
9.3/10★★★★★Visit Arize Phoenix -
Best forMature teams monitoring LLM applications
A mature monitoring platform for teams operating complex LLM applications and agents.
Free plan · 30-day trial Our W&B Weave verdict → Visit W&B WeaveFor vendors Sponsor this spot · #3 · $79/mo →9.1/10★★★★★Visit W&B Weave -
Best forOpen-source teams needing complete LLM observability
A broad LLM monitoring platform with open-source, self-hosted, and managed deployment options.
9.0/10★★★★☆Visit Langfuse -
Best forBudget-conscious teams needing broad LLM monitoring
Broad LLM monitoring with open-source, free-cloud, and $19/month Pro options.
8.9/10★★★★☆Visit Opik -
Best forLangChain teams needing hosted monitoring
A broad monitoring platform for teams building and operating LLM applications.
8.8/10★★★★☆Visit LangSmith -
Best forTeams monitoring complex agent workflows
A broad monitoring and evaluation platform for complex LLM and agent workflows.
8.7/10★★★★☆Visit HoneyHive -
Best forTeams needing agent, RAG, and cost monitoring
A broad monitoring platform for tracing, evaluating, testing, and controlling AI systems.
8.6/10★★★★☆Visit LangWatch -
Best forTeams wanting gateway-based LLM observability
A gateway-centered monitoring platform with tracing, evaluations, cost analytics, and self-hosting.
8.5/10★★★★☆Visit Helicone -
Best forSelf-hosted teams monitoring full LLM stacks
A self-hosted observability suite for tracing, evaluating, and managing full LLM stacks.
8.4/10★★★★☆Visit OpenLIT -
Best forOpen-source evaluation-focused monitoring teams
A broad open-source toolkit for evaluating, tracing, and monitoring production AI systems.
8.3/10★★★★☆Visit Evidently AI -
Best forOrganizations prioritizing evaluation governance
A governance-focused platform with broad evaluation, tracing, and deployment controls.
8.2/10★★★★☆Visit Braintrust -
Best forTeams combining evaluations and runtime guardrails
A strong fit for teams connecting AI evaluations, tracing, and runtime guardrails.
8.1/10★★★★☆Visit Galileo -
Best forTeams needing affordable evaluation workflows
A broad AI evaluation and monitoring workspace with a low-cost paid entry point.
8.0/10★★★★☆Visit Maxim AI -
Best forTeams needing low-cost agent observability
A low-cost AI-agent monitoring platform with detailed tracing, debugging, and evaluations.
- Performance monitoring
7.9/10★★★★☆Visit Laminar -
Best forTeams needing tracing plus runtime safety controls
A broad monitoring suite for teams that need tracing, evaluations, guardrails, and cost visibility.
7.8/10★★★★☆Visit Fiddler AI -
Best forOpen-source teams wanting a self-hosted monitor
A self-hosted LLM monitor with tracing, evaluation, prompt management, and automation.
- Performance monitoring
7.7/10★★★★☆Visit Memoturn -
Best forClassical ML teams monitoring fairness and drift
A flexible monitoring platform for classical ML teams focused on drift and fairness.
- Bias monitoring
7.6/10★★★★☆Visit Arthur -
Best forML teams needing broad quality and bias checks
Broad drift, performance, data-quality, and bias monitoring with open-source access.
- Bias monitoring
7.5/10★★★★☆Visit Deepchecks -
Best forBudget-conscious classical ML monitoring teams
Broad monitoring and governance coverage for teams that want low monthly entry pricing.
- Bias monitoring
7.4/10★★★★☆Visit SUPERWISE -
Best forTeams monitoring performance without labels
A flexible monitoring stack for teams that need performance estimates without labels.
7.3/10★★★★☆Visit NannyML -
Best forSmall teams monitoring model health affordably
Affordable model monitoring with core drift, quality, anomaly, and alerting coverage.
- Drift detection
- Data quality monitoring
- Performance monitoring
7.1/10★★★★☆Visit Qualdo-MQX -
Best forSelf-hosted teams monitoring traditional ML metrics
A focused self-hosted monitor for drift and traditional ML performance.
6.9/10★★★☆☆Visit Pulsar -
Best forPaid teams needing basic LLM observability
A paid toolkit for tracing, evaluating, and improving LLM applications.
6.6/10★★★☆☆Visit Lunary
No tools match those filters.
Compare at a glance
| # | Tool | Free plan | Paid from | Score |
|---|---|---|---|---|
| 1 | Arize AX | Yes | $50/mo | 9.4 |
| 2 | Arize Phoenix | Yes | Free | 9.3 |
| 3 | W&B Weave | Yes | $60/mo | 9.1 |
| 4 | Langfuse | Yes | $29/mo | 9.0 |
| 5 | Opik | Yes | $19/mo | 8.9 |
| 6 | LangSmith | Yes | $39/seat/mo | 8.8 |
| 7 | HoneyHive | Yes | 8.7 | |
| 8 | LangWatch | Yes | €29/seat/mo | 8.6 |
| 9 | Helicone | Yes | $79/mo | 8.5 |
| 10 | OpenLIT | Yes | Free | 8.4 |
| 11 | Evidently AI | Yes | Free | 8.3 |
| 12 | Braintrust | Yes | $249/mo | 8.2 |
| 13 | Galileo | Yes | $100/mo | 8.1 |
| 14 | Maxim AI | Yes | $29/seat/mo | 8.0 |
| 15 | Laminar | Yes | $30/mo | 7.9 |
| 16 | Fiddler AI | Yes | $0.002/unit usage-based | 7.8 |
| 17 | Memoturn | Free | 7.7 | |
| 18 | Arthur | Yes | $60/mo | 7.6 |
| 19 | Deepchecks | Yes | 7.5 | |
| 20 | SUPERWISE | No | $10/mo | 7.4 |
| 21 | NannyML | Yes | $99/mo | 7.3 |
| 22 | Qualdo-MQX | Yes | $88/mo | 7.1 |
| 23 | Pulsar | Free | 6.9 | |
| 24 | Lunary | No | $20/user/mo | 6.6 |
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How we rank model monitoring software
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