Promptfoo vs E2B
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 | E2B |
|---|---|---|
| Overall | 8.4 | 8.6 |
| Capability fit | 8.2 | 9.4 |
| Price / performance | 9.2 | 8.0 |
| Latency / reliability | 7.8 | 8.6 |
| Developer & agent DX | 8.8 | 9.4 |
| Privacy / data retention | 9.0 | 8.5 |
| Lock-in risk (higher = worse) | 2.5 | 4.0 |
| Maturity / track record | 8.0 | 8.0 |
| 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… | Firecracker microVM sandboxes billed per second; templates; code interpreter for agents. |
| Tagline | Default OSS eval harness. Braintrust when you want hosted collaboration; Promptfoo when you want local/CI… | Depot default code sandbox for agents. Use for untrusted code; Daytona when you need persistent… |
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
E2B
Depot default code sandbox for agents. Use for untrusted code; Daytona when you need persistent devworkspaces. Also the depot default Linux desktop sandbox for computer-use (e2b-desktop + VNC stream) when you already standardize on E2B. Strengths: Purpose-built for LLM code execution; Strong isolation (microVMs); Excel
Strengths
- Purpose-built for LLM code execution
- Strong isolation (microVMs)
- Excellent agent SDK fit
Weaknesses
- Per-sandbox-second costs add up
- Less persistent than Daytona workspaces
- Younger than hyperscalers
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