Arize AI vs Evidently AI: Pricing and Ratings Compared (2026)
Entry prices and free plans as read on each vendor's pricing page, and user ratings as published on review sites, for Arize AI and Evidently AI side by side. This page compares data; it is not a hands-on review.
On the data: On the data below the two are close or not directly comparable, so we do not name a winner for this pair.
Short on time? Here's the quick answer
Based on published vendor pricing and features and on public review data, here's who should pick what:
Arize AI
The AI & Agent Engineering Platform for LLM observability, evaluation, and development.
Best for you if:
- • You want provides a comprehensive, unified platform for the entire AI lifecycle from development to production
Evidently AI
Evaluate and monitor your AI systems for safety, reliability, and performance.
Best for you if:
- • You want built on a popular open-source framework with a large community
| At a Glance | Arize AI | Evidently AI |
|---|---|---|
Starts at | Free plan, paid from $50/mo, billed monthly AX Pro plan | Free plan, paid from $50/mo, billed monthly Pro plan |
Category | AI Observability AI Prompt Tools | AI Observability Testing & QA |
Rating | 4.3/5 G2 4.3 48 reviews | n/a |
Free plan | Yes | Yes |
Watch out for | Self-hosting is an Enterprise add-on | Overage fees for data rows not explicitly stated |
Choose Arize AI or Evidently AI?
Choose Arize AI if
- You want provides a comprehensive, unified platform for the entire AI lifecycle from development to production
- You want offers advanced evaluation capabilities like LLM-as-a-Judge and human annotation for robust AI
Choose Evidently AI if
- You want built on a popular open-source framework with a large community
- You want comprehensive suite of metrics and evaluation capabilities for various AI systems
In-Depth Analysis
Arize AI
The AI & Agent Engineering Platform for LLM observability, evaluation, and development.
Arize AI offers a generous free tier (AX Free) and an open-source option (Phoenix), making it highly accessible for individual developers and small teams.
Watch out
Self-hosting is an Enterprise add-on
Strengths
- Pro: Provides a comprehensive, unified platform for the entire AI lifecycle from development to production.
- Pro: Offers advanced evaluation capabilities like LLM-as-a-Judge and human annotation for robust AI.
- Pro: Built on open standards and open-source components, promoting transparency and flexibility.
- Pro: Includes an AI assistant (Alyx) to aid in debugging and accelerate development.
- Pro: Scalable for enterprise use with features like custom data limits, SOC2, and HIPAA compliance.
Weaknesses
- Con: The complexity of features might have a learning curve for new users.
- Con: Pricing for higher tiers is custom, which may require direct engagement with sales.
- Con: Specific limitations on trace spans and ingestion volume for free and lower-paid tiers.
Key features
Evidently AI
Evaluate and monitor your AI systems for safety, reliability, and performance.
Evidently AI offers a generous free Developer tier, making it highly accessible for individual users and small projects.
Watch out
Overage fees for data rows not explicitly stated
Strengths
- Pro: Built on a popular open-source framework with a large community.
- Pro: Comprehensive suite of metrics and evaluation capabilities for various AI systems.
- Pro: Supports both LLM-powered and traditional ML models.
- Pro: Offers continuous testing and monitoring to catch issues early.
- Pro: Provides advisory services and training for effective implementation.
Weaknesses
- Con: Advanced features like synthetic data and adversarial testing are in higher-tier plans.
- Con: Pricing for higher tiers can be significant for smaller teams.
- Con: Requires integration into existing AI/ML pipelines.
Key features
Plans and prices: Arize AI vs Evidently AI
| Tool | Plans and prices | Source |
|---|---|---|
| Arize AI |
| arize.com/pricing read Oct 11, 2026 |
| Evidently AI |
| evidentlyai.com/pricing read Oct 8, 2026 |
Prices as read on each vendor's own pricing page on the date shown. Plans are listed per tool and are not matched against the other tool's plans: a plan name or price in one column says nothing about the same row in the other. Details on Arize AI pricing and Evidently AI pricing.
Key Takeaways
Arize AI
- Choose if you want the AI & Agent Engineering Platform for LLM observability, evaluation, and development
Evidently AI
- Choose if you want evaluate and monitor your AI systems for safety, reliability, and performance
What the data shows
On the data below the two are close or not directly comparable, so we do not name a winner for this pair.
- Only Arize AI has a published user rating (4.3/5 from 48 reviews); Evidently AI has none we can show.
- Both start at the same entry price ($50/mo, billed monthly).
- Both have a free plan.
Criteria: user rating (only above 20 reviews on both sides, gap of 0.2 or more), entry price (only on the same billing basis), free plan. How we rate
Frequently Asked Questions
How do Arize AI and Evidently AI compare in 2026?
On the data below the two are close or not directly comparable, so we do not name a winner for this pair. Only Arize AI has a published user rating (4.3/5 from 48 reviews); Evidently AI has none we can show. Both start at the same entry price ($50/mo, billed monthly). Both have a free plan.
What are Arize AI and Evidently AI used for?
Arize AI: The AI & Agent Engineering Platform for LLM observability, evaluation, and development. Evidently AI: Evaluate and monitor your AI systems for safety, reliability, and performance.
What does Arize AI cost vs Evidently AI?
Arize AI's cheapest paid plan is AX Pro at $50/mo, billed monthly; it also has a free plan. Evidently AI's cheapest paid plan is Pro at $50/mo, billed monthly; it also has a free plan. Prices read on the vendors' pricing pages, latest check Oct 11, 2026.
What's the main difference between Arize AI and Evidently AI?
Arize AI's main strength: provides a comprehensive, unified platform for the entire AI lifecycle from development to production. Evidently AI's main strength: built on a popular open-source framework with a large community.