Key facts

Founded
2020
HQ
San Francisco, United States
Employees
—
Website
Funding stage
Private · Dynatrace-owned
LinkedIn
Further facts
  • Ownership: Dynatrace (NYSE: DT) completed its acquisition of Arize on 1 October 2026; Arize AX remains available as a standalone offering and Phoenix stays open source.
  • Funding: Before the acquisition Arize raised a US$70m Series C in February 2025, led by Adams Street Partners with M12, Datadog and PagerDuty among the participants.
  • Timeline: Arize acquired Velvet in March 2025 to add developer AI infrastructure.
  • Partnership: Arize works with Deloitte Canada on multiagent system adoption.

Focus areas

LLM evaluation AI observability Open source Developer tools

About

Arize is a San Francisco-based AI observability and evaluation company that launched in 2020 and became part of Dynatrace in October 2026. Its tools let AI engineering teams trace, test and monitor machine-learning models, LLM applications and AI agents from development through production. Arize AX is the enterprise platform and Arize Phoenix the open-source project; users include Booking.com, Condé Nast, Duolingo, PepsiCo and Uber. Co-founders Jason Lopatecki and Aparna Dhinakaran joined Dynatrace with the team.

How they use AI

Arize AX traces how AI agents and applications behave, measures quality with evaluations, including LLM-as-a-judge and session-level evals that run at scale, and monitors production performance so teams can test prompts and harnesses before release and keep improving prompts, models and workflows. LG Uplus uses AX evaluation to improve its customer-service agents. Phoenix provides the same tracing and evaluation as open source, and Dynatrace plans to connect Arize's development-time evaluation with its production observability platform.

Products and services

  • Arize AX — Enterprise platform for LLM and agent tracing, evaluation and monitoring
  • Arize Phoenix — Open-source AI tracing and evaluation project
  • ML observability — Monitoring for drift and performance of traditional ML models

Notable customers / partners

  • Booking.com
  • Condé Nast
  • Duolingo
  • PepsiCo
  • Uber
  • LG Uplus

Key people

  • Jason Lopatecki — Co-Founder and CEO
  • Aparna Dhinakaran — Co-Founder and Chief Product Officer