Arize Phoenix vs Zep
| Tagline | Open-source AI observability and evaluation | Context engineering and memory for AI agents |
|---|---|---|
| Category | AI Agents | AI Agents |
| Pricing | Open Source | Freemium |
| Upvotes | 0 | 0 |
| Comments | 0 | 0 |
| Page views | 0 | 0 |
| Click-through to site | 0.0% | 0.0% |
| Readiness Score | 100/100 | 100/100 |
| Launched | Oct 5, 2026 | Oct 5, 2026 |
| Maker | — | — |
What is Arize Phoenix?
Phoenix by Arize is an open-source tool for tracing, evaluating and troubleshooting LLM applications and agents.
What is Zep?
Zep provides long-term memory for agents using a temporal knowledge graph built from conversations and business data.
Not sold on either? See alternatives to Arize Phoenix or alternatives to Zep.
Verdict
These two are evenly matched on the measurable metrics above. Choose Arize Phoenix if you want open-source AI observability and evaluation; choose Zep if you want context engineering and memory for AI agents.
Is Arize Phoenix better than Zep?
They perform similarly on community data; pick based on features and pricing.
Which is cheaper, Arize Phoenix or Zep?
Arize Phoenix is Open Source; Zep is Freemium. Check each website for current plans.