Observability for models in production.
Arize monitors AI systems after deployment — tracing LLM calls\, detecting drift\, running evaluations and surfacing the issues worth investigating — with Phoenix\, its open-source local-first platform\, underneath.
Phoenix is the smart part of the packaging: you start local and open source\, then move to the hosted platform only when you need scale. The free AX tier gives 25k spans and 1GB monthly with unlimited users and evaluations.
Quick Information
Platform
Web
Pricing
Free + Paid (from $50/mo)
API
Available
Category
Analytics
Pros and Cons
Pros
- Open-source Phoenix to start locally
- Free tier with unlimited users
- Drift detection and evaluation
- Cheap $50 Pro tier
- Startup discount programme
Cons
- 15-day retention on the free tier
- Span limits bite at scale
- Enterprise pricing not published
- Learning curve around eval design