EvalGuard vs Arize AI / Phoenix.
Best free observability platform, no red teamingArize Phoenix is a free, source-available observability platform (Elastic License 2.0) with a prompt playground, versioned prompt management, pre-built evaluators and many provider integrations. It has no red teaming, no attack plugin library, no runtime firewall and no gateway.
across the 10-row feature matrix · 1 row unverified, counted for neither side · see “where Arize AI / Phoenix leads” below
Competitor data (GitHub stars, downloads, feature counts, funding / acquisition status) verified as of 2026-08-10. EvalGuard's own counts are sourced live from the drift-checked registry.
Coverage at a glance
EvalGuard vs Arize AI / Phoenix, by the numbers
Where both platforms publish a number, here's the gap. Our values come straight from the drift-checked registry; Arize AI / Phoenix's are quoted as published.
| Feature | EvalGuard | Arize AI / Phoenix |
|---|---|---|
| Attack Plugins | 300+ | 0 |
| Eval Scorers | 200+ | 26 pre-built (11 LLM classifiers + 15 metrics) |
| Compliance Frameworks | 50 | Not a stated capability |
| LLM Firewall | 5-layer | No |
| LLM Gateway | Yes | No |
| Observability | OpenTelemetry | Best-in-class (free) |
| Prompt IDE | Yes | Playground + versioned prompts |
| NL→Eval Pipeline | Yes (unique in this guide) | No |
| Pricing | Free tier | Completely free |
| Open Source | Apache 2.0 (SDKs + CLI) | Source-available (Elastic License 2.0) |
Why choose EvalGuard over Arize AI / Phoenix
- 300+ attack plugins — Phoenix ships no red-team or attack library
- Apache 2.0 on our published SDKs and CLI — Phoenix is Elastic License 2.0, which restricts offering it as a managed service
- 5-layer firewall + gateway — Phoenix has neither
- All-in-one: eval + security + observability + gateway
Where Arize AI / Phoenix leads
- Arize Phoenix is completely free with excellent observability
- Phoenix ships a prompt playground and versioned prompt management — on a par with our prompt IDE, not absent as this page previously said
- Phoenix has best-in-class free-tier LLM tracing and evaluation
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