EvalGuard vs Promptfoo.
Open-source eval framework, acquired by OpenAI (announced 2026-03-09)Promptfoo is a popular open-source LLM evaluation framework with 155 red team plugins, 66 assertion types, and 60+ providers. It has ~24K GitHub stars and 300K+ developers. OpenAI announced its acquisition on 2026-03-09; Promptfoo states the project remains open source and MIT licensed.
across the 15-row feature matrix · see “where Promptfoo leads” below
Competitor data (GitHub stars, downloads, feature counts, funding / acquisition status) verified as of 2026-08-09. EvalGuard's own counts are sourced live from the drift-checked registry.
Coverage at a glance
EvalGuard vs Promptfoo, by the numbers
Where both platforms publish a number, here's the gap. Our values come straight from the drift-checked registry; Promptfoo's are quoted as published.
| Feature | EvalGuard | Promptfoo |
|---|---|---|
| Attack Plugins | 300+ | 155 |
| Eval Scorers | 200+ | 66 assertion types |
| LLM Providers | 90+ | 60+ |
| Attack Strategies | 100+ | 36 |
| Compliance Frameworks | 50 | 9 |
| LLM Firewall | 5-layer Visual Builder, all tiers | Adaptive Guardrails (Enterprise) |
| LLM Gateway | Yes (routing, caching) | No |
| Agent Tracing | OpenTelemetry | OpenTelemetry receiver |
| Cost Analytics | FinOps dashboard, budgets | Per-eval cost totals |
| Prompt IDE | Versioning + diff + deploy | Eval-creator UI |
| NL→Eval Pipeline | Yes (unique in this guide) | No |
| Benchmark Suites | 34 (EvalGuard-authored cases) | 10 dataset plugins (public corpora) |
| BYOK Encryption | Yes | No |
| Open Source | Apache 2.0 (SDKs + CLI) | MIT (~24K★) |
| Vendor Neutral | Yes (independent) | Part of OpenAI (2026-03-09) |
Why choose EvalGuard over Promptfoo
- 300+ attack plugins vs 155 — 2.2x more red team coverage
- 200+ scorers vs 66 assertion types — 3.7x more evaluation depth
- Vendor neutral — not owned by any LLM provider
- LLM gateway, Shadow AI discovery, AI-SPM and Smart Copilot — Promptfoo ships none of these, and its guardrails layer is Enterprise-tier only
- 50 compliance frameworks vs their 9 (we add India DPDP, HIPAA, SOC 2, NIST CSF + 41 more beyond their set)
- NL→Eval pipeline — describe your app in English, get a complete eval suite
Where Promptfoo leads
- Promptfoo has a larger community (~24K stars, 300K+ developers)
- Promptfoo acts as an OpenTelemetry receiver and ships 10 public-dataset plugins (HarmBench, CyberSecEval, ToxicChat and others) — our benchmark suites ship EvalGuard-authored cases, not those corpora
- Promptfoo has strong CI/CD templates and CLI-first workflow
- Promptfoo is free and open source (MIT license)
- Promptfoo states that under OpenAI the project remains open source and MIT licensed, and that they will continue to serve existing users and customers
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