Arize vs MLflow (2026): Pricing, Features & Which to Choose

Who comes out ahead

Based only on the facts in our directory. The right pick still depends on the job you need done.

Lower starting price
Not comparable
Not comparable: Arize does not list a price
Free plan
MLflow
Only MLflow has one
Higher rating
Arize
4.2 against 3.8
Same job?
Yes
Both are AI Infrastructure & Agent Tooling tools

Side by side

Compared on	Arize	MLflow
Our rating	4.2Better	3.8
Starts at	Not listed	Free
Free plan	No	YesBetter
Category	AI Infrastructure & Agent Tooling	AI Infrastructure & Agent Tooling
Plans	See pricing	Free
Key features	Started in traditional ML drift and performance monitoring before expanding to LLMs Open-source Arize Phoenix framework for generative AI observability LLM evaluation and prompt versioning through a Prompt Hub Tracing built for multi-step, conversational agent applications $131M raised, valued at over $1 billion as of its February 2025 Series C	Experiment tracking, hyperparameter tuning, and model registry Prompt optimization using state-of-the-art algorithms AI-powered issue detection across 6 quality dimensions Covers both traditional ML and modern LLM/agent workflows in one platform 100% open source (Apache 2.0), backed by the Linux Foundation
Pros	Covers both traditional ML monitoring and generative AI evaluation in one platform Open-source Phoenix framework gives a free, inspectable starting point before adopting the full platform Billion-dollar valuation and $131M raised signal real staying power	Handles both classic ML lifecycle management and LLM/agent evaluation in one tool No vendor lock-in - fully open source and self-hostable Genuinely massive, active adoption (30M+ monthly downloads, Fortune 500 production use)
Cons	Enterprise pricing isn't published, so budgeting requires a sales conversation Broad scope spanning classic ML and generative AI can mean more setup than a single-purpose LLM tool Competes directly against well-funded peers like Braintrust and LangSmith in a crowded observability market	A code library/platform, not a hosted no-code product Self-hosting requires real infrastructure and ML engineering expertise No managed commercial support beyond community/documentation channels
Company	Arize AI, founded 2020	MLflow (Linux Foundation)

Prices come from each vendor's pricing page, last checked 20260824. Check the vendor before you buy.

FAQ

Questions people ask

Is Arize better than MLflow?

In our reviews Arize scores 4.2 and MLflow scores 3.8. The better pick depends on the job. Arize: Grew from traditional ML monitoring into a $1B+ AI engineering platform for evaluating agents in production. MLflow: The largest open-source AI engineering platform for agents, LLMs, and ML models - 30M+ downloads a month, Fortune 500 production use, backed by the Linux Foundation.

Which is cheaper, Arize or MLflow?

Arize: see pricing. MLflow: free.

Do Arize and MLflow have free plans?

Only MLflow has a free plan.

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