Arize AX
AX Free: LLM and agent tracing and evaluation with 25k spans a month.
Dev Tools
What you get
Hosted tracing, evaluations and monitoring for LLM apps and agents: 25,000 spans and 1 GB of ingestion a month, unlimited users and evals.
How to get it
Click "Start for free" under AX Free on arize.com/pricing.
What it requires
No credit card required.
The catch
Data is kept for only 15 days and 25k spans a month is the cap; AX Pro is $50 a month for 50k spans, 10 GB and 30-day retention.
From the official page · checked Oct 27, 2026