Drift detection
Compare candidate prompts against baselines on identical inputs. Surface semantic drift, quality regressions, and silent model changes before they ship.
Prompt testing for CI/CD pipelines
Validate prompt updates against baselines, catch quality drift before production, and gate every merge with automated evaluations.
No credit card required · Free for open source
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< 200ms
Avg evaluation latency
12+
Scoring dimensions
99.9%
Pipeline uptime
50k+
Prompts evaluated daily
Capabilities
Everything you need to ship safely
A complete toolkit for prompt testing — from drift detection to human review, integrated into your existing CI workflow.
CI/CD gates
Trigger evaluations from your pipeline with sync APIs. Enforce scoring thresholds and speed regression limits as automated pass/fail gates on every merge.
Streaming updates
Subscribe to server-sent events as runs progress through resolve, execute, score, and persist. Ideal for dashboards and long-running jobs.
Rich scoring
Task accuracy, LLM-judge quality, moderation flags, format compliance, refusal rate, tool-call checks, and latency — all recorded per run and per case.
Human review
Annotators label results as regression, neutral, or improvement. Regressions force a fail so human judgment stays in the loop alongside automation.
Suites & versioning
Organize prompts by suite, filter with tags like critical or safety, and version baselines so every comparison is fully traceable and reproducible.
Workflow
Three steps to safe prompts
Silo fits into your existing development workflow — no new tools to learn.
01
Define your baseline
Version your production prompts and attach golden test cases. Silo snapshots the baseline so every future run has a stable reference point.
02
Run evaluations in CI
Push a prompt change and your pipeline triggers a Silo run. Candidate outputs are scored across accuracy, quality, safety, and speed dimensions.
03
Gate or ship
If scores pass your thresholds, the merge goes through. If drift is detected, the pipeline fails with a detailed diff — no regressions reach production.
Start shipping prompts
with confidence
Set up your first drift test in under five minutes. Free for open-source projects, with plans that scale to enterprise.