The testing infrastructure LLM products deserve
PromptReliability Labs was founded by engineers who spent too many late nights debugging prompt regressions that slipped past manual QA. We built the automated testing layer we wished existed.
Our Story
When LLMs moved from research demos to production systems, the tooling didn't keep up. Teams were deploying prompt changes with nothing more than a quick manual spot-check — and discovering regressions only when customers reported broken experiences.
We saw the same pattern at every company we worked with: a model provider pushes an update, a well-intentioned prompt tweak goes live, and suddenly 15% of responses are subtly wrong. No alert fires. No test fails. The degradation compounds silently until someone notices days later.
PromptReliability Labs exists to close that gap. We bring the same rigor that traditional software testing provides — automated regression suites, continuous monitoring, and quality gates — to the world of prompts and language models. Because if your product depends on an LLM, your prompts deserve real tests.
Our Mission
Make every LLM-powered product as testable, measurable, and reliable as traditional software — without slowing down the pace of innovation.
Reliability First
We believe every prompt change should be provably safe. Our tools give teams the confidence to iterate fast without risking production quality.
Transparency by Default
Hidden failures are the most expensive kind. We surface every regression, every drift, every quality shift — so nothing slips through unnoticed.
Developer Experience Matters
Testing shouldn't be a chore. We integrate into the tools and workflows engineers already use, so quality checks feel native, not bolted on.
Join us in making LLMs reliable
Start catching prompt regressions today with a free trial.