kitio.aiArize AI vs Remyx
A side-by-side look at pricing plans, free tiers, features, pros and cons, updated for 2026. Arize AI starts at $50/mo and Remyx starts at See pricing page. Check both pricing pages for current plans.
At a glance
Best for
Category
Pricing model
Starting price
Free plan
Made by
Based in
Rating
Key features
- Arize Phoenix open source
- Agent tracing
- Online evaluations
- Drift monitoring
- Debugging copilot
- PR-based evaluations
- Research-driven draft PRs
- Cost reports per run
- Decision history
- CLI, API and MCP server
| Feature | Arize AI | Remyx |
|---|---|---|
| Best for | AI observability and evaluation, plus the open-source Phoenix | Tests proposed changes to AI systems and reports results on the PR |
| Category | Models & APIs | Models & APIs |
| Pricing model | Freemium | Freemium |
| Starting price | $50/mo | See pricing page |
| Free plan | Yes | Yes |
| Made by | Arize AI | Remyx AI |
| Based in | United States | – |
| Rating | No ratings yet | No ratings yet |
| Key features |
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Pricing compared
Arize AI starts at $50/mo and Remyx starts at See pricing page. Check both pricing pages for current plans.
Free plan
Cheapest paid plan
Top plan
Free trial
3 plans
AX Free
Free
- 25k spans/month
- 1 GB ingestion/month
- 15 days retention
- Unlimited users
AX Pro
$50/mo
- 50k spans/month
- 10 GB ingestion/month
- 30 days retention
AX Enterprise
Contact sales
- Custom plans
2 plans
Outrider
Free
- Open-source GitHub Action
- Daily paper digest
- Draft PRs for review
Validate
Credit top-ups from $10
- First validation free
- Pay for compute and model calls
- Receipt on each PR
Prices in USD, checked Oct 28, 2026 or later. Plans change often, so confirm on each tool's site before you buy.
Pros and cons
Arize AI
- Free open-source Phoenix
- Covers classic ML and LLMs
- Strong enterprise features
- AX costs rise with volume
- Two products can confuse
- Steeper setup than simple tools
Remyx
- First validation free per installation
- Outrider is open source and free
- Works on PRs however they were written
- Compute and model calls are billed as usage
- Outrider needs your own model API key
- Aimed at ML teams, not general users
Which one should you choose?
Choose Arize AI if you want:
- Free open-source Phoenix
- Covers classic ML and LLMs
- Strong enterprise features
Watch out: ax costs rise with volume.
Choose Remyx if you want:
- First validation free per installation
- Outrider is open source and free
- Works on PRs however they were written
Watch out: compute and model calls are billed as usage.
Arize AI vs Remyx FAQ
What is the difference between Arize AI and Remyx?
Arize AI: AI observability and evaluation, plus the open-source Phoenix. Remyx: Tests proposed changes to AI systems and reports results on the PR. Both are models & apis tools.
Is Arize AI or Remyx cheaper?
Arize AI starts at $50/mo and Remyx starts at See pricing page. Check both pricing pages for current plans.
Do Arize AI and Remyx have free plans?
Arize AI: Yes. Remyx: Yes.
Who makes Arize AI?
Arize AI is made by Arize AI, based in United States.
Who makes Remyx?
Remyx is made by Remyx AI.
Which should I choose, Arize AI or Remyx?
Choose Arize AI if you value free open-source phoenix and covers classic ml and llms. Choose Remyx if you value first validation free per installation and outrider is open source and free.