kitio.aiArize AI vs Respan
A side-by-side look at pricing plans, free tiers, features, pros and cons, updated for 2026. Arize AI starts at $50/mo and Respan 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
- One API for 1,000+ models
- Automatic model fallbacks
- Response caching
- Agent tracing
- LLM-as-judge evaluators
- Red-team testing
| Feature | Arize AI | Respan |
|---|---|---|
| Best for | AI observability and evaluation, plus the open-source Phoenix | LLM gateway with tracing, monitoring and automated evals |
| Category | Models & APIs | Models & APIs |
| Pricing model | Freemium | Freemium |
| Starting price | $50/mo | See pricing page |
| Free plan | Yes | Yes |
| Made by | Arize AI | Respan |
| Based in | United States | – |
| Rating | No ratings yet | No ratings yet |
| Key features |
|
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Both offer: Agent tracing.
Pricing compared
Arize AI starts at $50/mo and Respan 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
3 plans
Free
Free
- 100k logs
- 1k scores
- 5 datasets
- 2 evaluators
Team
$199/mo billed yearly
- Unlimited datasets and evaluators
- Unlimited prompts
- SOC 2 report
- Private Slack channel
Enterprise
Contact sales
- Custom packages
- Custom SLAs
- Dedicated support engineer
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
Respan
- Routing and evals in one product
- Generous free tier with 100k logs
- Open-source gateway
- Team plan is billed yearly
- Extra logs and seats cost more
- HIPAA compliance is a paid add-on
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 Respan if you want:
- Routing and evals in one product
- Generous free tier with 100k logs
- Open-source gateway
Watch out: team plan is billed yearly.
Arize AI vs Respan FAQ
What is the difference between Arize AI and Respan?
Arize AI: AI observability and evaluation, plus the open-source Phoenix. Respan: LLM gateway with tracing, monitoring and automated evals. Both are models & apis tools.
Is Arize AI or Respan cheaper?
Arize AI starts at $50/mo and Respan starts at See pricing page. Check both pricing pages for current plans.
Do Arize AI and Respan have free plans?
Arize AI: Yes. Respan: Yes.
Who makes Arize AI?
Arize AI is made by Arize AI, based in United States.
Who makes Respan?
Respan is made by Respan.
Which should I choose, Arize AI or Respan?
Choose Arize AI if you value free open-source phoenix and covers classic ml and llms. Choose Respan if you value routing and evals in one product and generous free tier with 100k logs.