Best free observability platform, zero security
Arize Phoenix is the best completely free observability platform with 7.8K GitHub stars and 2.5M+ downloads. It offers pre-built evaluators and many provider integrations. However, it has zero red teaming, zero attack plugins, no firewall, no gateway, and no prompt IDE.
Competitor data (GitHub stars, downloads, feature counts, funding/acquisition status) verified as of 2026-04-28.
| Feature | EvalGuard | Arize AI / Phoenix |
|---|---|---|
| Attack Plugins | 249 | 0 |
| Eval Scorers | 138 | Pre-built evaluators |
| Compliance Frameworks | 33 | 1 |
| LLM Firewall | 5-layer | No |
| LLM Gateway | Yes | No |
| Observability | OpenTelemetry | Best-in-class (free) |
| Prompt IDE | Yes | No |
| NL→Eval Pipeline | Yes (unique) | No |
| Pricing | Free tier | Completely free |
| Open Source | Apache 2.0 | Yes (7.8K★, 2.5M+ downloads) |
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