Open Source Platform & SDK

Collaborative testing for LLM & agentic apps

AI-powered test generation and multi-turn conversation simulation, plus review workflows for cross-functional teams, so you catch issues before production.

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Dive Into Testing

Fast, thorough, and surprisingly painless.

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Platform

Get Your Whole Team Involved

Legal, PMs, and domain experts capture requirements in plain language. Rhesis turns them into realistic test scenarios and a review flow, so teams spot failures early & agree on what “good” looks like.

SDK

Test Without Leaving Your IDE

Integrate Rhesis directly into your development workflow. Generate, run, and analyze tests from code, then sync results back to the platform for review. Fewer context switches, safer releases.

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END-TO-END Solution

Full testing cycle coverage

From 'I hope this works' to 'I know this works.' Everything you need to develop and ship with confidence instead of crossed fingers.

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Automated scenario creation at scale

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Domain-specific testing intelligence

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Real-world simulation engine

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Clear insights, actionable results

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Works with your existing stack

Reliable by design. Fun by Nature.

From 'It works on my machine' to production-ready

You spent weeks and months building something cool. Don't let sloppy testing ruin the release. Your Gen AI deserves testing that's as thoughtful as your architecture.

Advanced testing architecture, collaborative by design.
Built for teams, proven in production.
END-TO-END Solution

How it works

Great AI teams know what they're shipping before users do. Let's turn testing from "crossing fingers" into something as sophisticated as your development process.

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Connect application

Our API and SDK work with any Gen AI system, from simple chatbots to complex multi-agent architectures.

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Generate tests

Your team defines what matters: legal requirements, business rules, edge cases. We automatically generate thousands of test scenarios based on their expertise.

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Select metrics

Set quality benchmarks that actually matter to your team. Track performance, safety, compliance, and user experience with clear analytics.

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Improve quality

Receive detailed analysis that help you understand exactly how your Gen AI performs before your users do.

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Frequently asked questions

Everything you need to know about Rhesis AI, served with a smile.

What is Rhesis AI used for?
What types of applications can I test with Rhesis AI?
How is Rhesis AI different from manual testing, prompt QA or vibe-testing?
Does Rhesis AI support multi-turn conversation and agent testing?
How does Rhesis AI generate synthetic test cases?
How does Rhesis AI support collaborative testing across teams?
Who should use Rhesis AI?
Can non-engineers contribute to testing with Rhesis AI?
Is Rhesis AI open source?
How long does it take to get started?
Is Rhesis AI for pre-release testing or production monitoring?
What's with the platypus?
Blog post image

Observability vs. Testing: Why Rhesis needed dependency binding

Observability tools watch your functions run but can't invoke them remotely. Learn how Rhesis's bind parameter enables remote LLM testing with proper dependency injection, going beyond what Langfuse, TruLens, and OpenTelemetry offer.
Dr. Harry Cruz
January 20, 2026
17 mins
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How to test LLM-applications: A six-phase cycle

This article walks through six phases that form a testing cycle for LLM and agentic applications: configuring projects, defining requirements, selecting metrics, generating tests, executing evaluations, and collaborating on results. This is how we currently approach it at Rhesis. Each phase feeds the next, and the cycle repeats as your system matures.
Dr. Nicolai Bohn
January 20, 2026
11 mins
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Yes, we use AI to test AI: Why it's the only approach that scales

This year, I spent a considerable amount of time attending AI events. Meetups, conferences, hackathons, you name it. At some point, the conversations started to blur together: someone would ask what I do, I'd explain what we're building at Rhesis AI, and then the same question would land, almost every single time: "Wait, so you use AI testing AI? How do you know that AI is accurate?"
Nolusindiso Hleko
January 16, 2026
10 mins