Braintrust is an eval platform with a prompt playground and dataset management. It's built for evals before deploy, not governance after — no re-execution of production incidents, no policy enforcement, no signed audit trail.
| Capability | Braintrust | Runback | Note |
|---|---|---|---|
| Eval runner and dataset management | ✓ | ✓ | |
| Prompt playground and scoring | ✓ | ✓ | Includes pairwise (head-to-head) LLM-judge comparison with human calibration feedback |
| Human review UI | ✓ | ✗ | Braintrust speciality |
| Re-execute a production incident step-by-step | ✗ | ✓ | Braintrust replays eval DATASETS, not a specific captured production run — Runback bisects a live incident in log₂ tries |
| Live policy enforcement — block before it runs | ✗ | ✓ | |
| Golden corpus auto-mined from production failures | partial | ✓ | One-click promote-to-dataset plus auto-clustering of production traces — a manual promote step, not Runback's unattended mining |
| Signed, tamper-evident audit export | partial | ✓ | Enterprise tier documents an append-only, immutable audit log plus S3 export. What we could not find documented is a cryptographic signature or hash chain over it — which is what lets a third party verify a record without trusting the vendor's own storage guarantees |
| Regulatory mappings (EU AI Act · CPS 230 · NIST) | ✗ | ✓ |
It's built for evals before deploy, not governance after — no re-execution of production incidents, no policy enforcement, no signed audit trail. Most teams use both — Braintrust for what it's already good at, Runback for the incident replay, CI gate, and signed record it doesn't do.
Compiled from Braintrust's public documentation at https://www.braintrust.dev/docs, read on 15 September 2026. Products change; if a row is out of date or wrong, tell us at legal@runback.dev and we will correct it. All product names and trade marks are the property of their respective owners. Runback is not affiliated with, endorsed by, or sponsored by any of them.
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