Promptfoo vs Guardrails AI
Agent-native side-by-side. Scores are curated estimates on a 0–10 scale. Lock-in: higher = worse. Prefer JTBD picks via /api/decide when choosing for a job.
| Dimension | Promptfoo | Guardrails AI |
|---|---|---|
| Overall | 8.4 | 8.2 |
| Capability fit | 8.2 | 8.4 |
| Price / performance | 9.2 | 8.8 |
| Latency / reliability | 7.8 | 7.8 |
| Developer & agent DX | 8.8 | 8.2 |
| Privacy / data retention | 9.0 | 8.5 |
| Lock-in risk (higher = worse) | 2.5 | 3.0 |
| Maturity / track record | 8.0 | 7.8 |
| Pricing | As of 2026-10-24 (promptfoo.dev/pricing, fetched 2026-10-24): Community 'Free Forever' ('Our open-source tool, perfect for individual developers and small teams.') with 'Red teaming (10k probes/month)' and 'Run locally o… | As of 2026-10-28: OSS Guardrails + Guardrails Hub (70+ validators) free/self-host. Guardrails Pro enterprise managed — usage-based / quote; AWS Marketplace listings historically cite ~$50k annual optional contracts. No p… |
| Tagline | Default OSS eval harness. Braintrust when you want hosted collaboration; Promptfoo when you want local/CI… | OSS programmable rails peer to NeMo Guardrails. Lakera when you want a hosted injection firewall API… |
Promptfoo
Default OSS eval harness. Braintrust when you want hosted collaboration; Promptfoo when you want local/CI control. Strengths: OSS + CI-native; Red teaming built-in; Multi-provider comparisons.
Strengths
- OSS + CI-native
- Red teaming built-in
- Multi-provider comparisons
Weaknesses
- Less polished product UI than Braintrust
- Enterprise features gated
- You bring judge costs
Guardrails AI
OSS programmable rails peer to NeMo Guardrails. Lakera when you want a hosted injection firewall API; Guardrails Hub when validators-as-code is the product. Strengths: Largest OSS validator Hub; Local/self-host path with no meter tax; Composable with any LLM.
Strengths
- Largest OSS validator Hub
- Local/self-host path with no meter tax
- Composable with any LLM
Weaknesses
- Pro packaging opaque
- You own latency/ops when self-hosting
- Less turnkey firewall than Lakera
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