Shortlist by what you need
Start here if you know why you are leaving Arize.
Want the closest match?
MLflowMost similar to Arize in what it does, its category and its price.
Visit (opens MLflow in a new tab)Need a free plan?
LangChainHas a free plan, rated 4.4 out of 5. Arize has none.
Visit (opens LangChain in a new tab)Want the lowest price?
AgentOpsFrom $40/mo, the lowest starting price here.
Visit (opens AgentOps in a new tab)Want the best rated?
BraintrustRated 4.2 out of 5 in our review, against 4.2 for Arize.
Visit (opens Braintrust in a new tab)
At a glance
Green means better than Arize, red means worse. Prices are starting prices per month.
| Tool | Our rating | Starts at | Free plan | Best for | Compare |
|---|---|---|---|---|---|
 ArizeBaseline | 4.2 | Not listed | No | Grew from traditional ML monitoring into a $1B+ AI engineering platform for evaluating agents in production | |
| MLflow | 3.8−0.4 | Free | YesArize has none | 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. | vs Arize |
 Evidently AI | 3.7−0.5 | Free | YesArize has none | LLM-as-a-Judge evaluation with 100+ built-in metrics for hallucinations, toxicity, and PII - open-source, 7,500+ GitHub stars, used by DeepL, Wise, Plaid, and Databricks. | vs Arize |
| AgentOps | 4.2Same | $40/mo | YesArize has none | AgentOps gives developers observability into AI agents in production, tracing every action, tool call, and cost across 400-plus LLMs and frameworks. | vs Arize |
| Braintrust | 4.2Same | $249/mo | YesArize has none | Raised an ICONIQ-led $80M Series B building the evaluation layer teams use to ship AI products with confidence | vs Arize |
 Honeycomb | 3.8−0.4 | Not listed | No | "Built for the AI era" - dedicated LLM and AI agent observability, with BubbleUp finding root causes in under three minutes. | vs Arize |
| LangChain | 4.4+0.2 | Free | YesArize has none | The open-source framework behind 90 million monthly downloads and 35% of the Fortune 500 | vs Arize |
 Activeloop | 4.1−0.1 | $40/mo | YesArize has none | Database built for AI workloads that stores and streams multimodal training data, embeddings, images, video, and text, at scale. | vs Arize |
 Datatron | 3.9−0.3 | Not listed | No | MLOps with built-in AI governance - real-time bias and drift monitoring, explainability reports, and model deployment in 90% less time than a homegrown pipeline. | vs Arize |
The alternatives in detail
In order of how closely each one matches Arize.
MLflow
3.8Free
vs Arize−0.4Free plan
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.
- Experiment tracking, hyperparameter tuning, and model registry
- Prompt optimization using state-of-the-art algorithms
- AI-powered issue detection across 6 quality dimensions
Handles both classic ML lifecycle management and LLM/agent evaluation in one tool
A code library/platform, not a hosted no-code product
Evidently AI
3.7Free
vs Arize−0.5Free plan
LLM-as-a-Judge evaluation with 100+ built-in metrics for hallucinations, toxicity, and PII - open-source, 7,500+ GitHub stars, used by DeepL, Wise, Plaid, and Databricks.
- LLM-as-a-Judge evaluation methodology
- 100+ built-in metrics - hallucinations, toxicity, PII detection, retrieval quality
- Synthetic data generation for edge-case and adversarial testing
Fully open-source (Apache 2.0) - no vendor lock-in or opaque pricing
Open-source self-hosting requires real technical setup and maintenance
AgentOps
4.2$40/mo
vs ArizeSameFree plan
AgentOps gives developers observability into AI agents in production, tracing every action, tool call, and cost across 400-plus LLMs and frameworks.
- Visual event timeline for every agent run
- Time-travel debugging to replay sessions step by step
- Cost tracking across 400+ LLMs and frameworks
Open-source SDK under MIT license keeps core tracing free to self-host
Pro tier billing is usage-based, so costs climb fast for high-volume agents
Braintrust
4.2$249/mo
vs ArizeSameFree plan
Raised an ICONIQ-led $80M Series B building the evaluation layer teams use to ship AI products with confidence.
- Evaluation-first platform, not just logging and tracing after the fact
- Lets teams test and score AI product behavior before shipping
- Tracing priced per GB for production observability
Evaluation-first approach catches failures a pure logging tool would only surface after the fact
Jump from free straight to $249/month with no mid-tier option limits gradual scaling
Honeycomb
3.8Not listed
vs Arize−0.4
"Built for the AI era" - dedicated LLM and AI agent observability, with BubbleUp finding root causes in under three minutes.
- Dedicated LLM Observability for language model behavior
- AI Agent Observability and Agentic Intelligence (Canvas, MCP, MCP Skills)
- AI-powered anomaly detection for non-deterministic AI workflows
Purpose-built for AI/agent non-determinism, not traditional monitoring retrofitted for AI
Pricing isn't shown on the homepage
LangChain
4.4Free
vs Arize+0.2Free plan
The open-source framework behind 90 million monthly downloads and 35% of the Fortune 500.
- Standard building blocks for chains, retrieval, memory, and tool calling
- Free, open-source core framework with a massive existing ecosystem
- 90 million combined monthly downloads with LangGraph as of 2026
Free, open-source core with no licensing cost for the framework itself
Production observability and hosted deployment require separate paid products
Activeloop
4.1$40/mo
vs Arize−0.1Free plan
Database built for AI workloads that stores and streams multimodal training data, embeddings, images, video, and text, at scale.
- Open-core database purpose-built for multimodal AI training data
- Built-in dataset versioning and visualization
- Streaming access to public and private datasets for model training
Open-source core (Deep Lake) lets teams self-host and inspect the code
Free tier's 3 queries/day and 100MB storage cap suit only small experiments
Datatron
3.9Not listed
vs Arize−0.3
MLOps with built-in AI governance - real-time bias and drift monitoring, explainability reports, and model deployment in 90% less time than a homegrown pipeline.
- Real-time bias, drift and performance anomaly monitoring
- AI governance: explainability and observability reports
- Model cataloging, provisioning and A/B testing
Governance built into deployment, not a separate after-the-fact compliance step
Governance tooling surfaces data - humans still set the actual standards and thresholds
FAQ
Questions people ask
Is Arize free?
Arize does not list a free plan. Check its pricing page for current plans.
What is the best free alternative to Arize?
LangChain is the highest-rated alternative here with a free plan (4.4 out of 5). Other free options: AgentOps, Braintrust, Activeloop.
What is the cheapest alternative to Arize?
Among paid plans, AgentOps has the lowest starting price (from $40/mo). If you need it free, start with LangChain.
How did you pick these alternatives?
We match tools on what they do, their category and their price, using the details in our directory. Ratings come from our reviews and reader reviews.