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.

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.

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.

Automated scenario creation at scale

Domain-specific testing intelligence

Real-world simulation engine

Clear insights, actionable results

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.

Platypus Pond

Frequently asked questions

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

What's with the platypus?
What makes Rhesis different from other AI testing tools?
Is this really enterprise-ready if it's open source?
What can I actually do with it?
Is there a cloud version?
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Collaboration > Computation: Why domain experts matter more than "AI Skills"

The shift AI has brought to software development goes beyond coding assistants and faster deployments. The more fundamental change is that the people who understand the problem domain can no longer sit on the sidelines.
Harry Cruz
December 8, 2025
13 mins
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Building MCP connections for the Rhesis platform: what I learnt about PRDs & shipping simple MVPs

It started the same way many of my engineering mistakes begin: with a beautifully over-designed document. I had spent hours writing a lengthy, thoughtful Product Requirements Document (PRD) for our Model Context Protocol (MCP) integration...
Emanuele de Rossi
December 2, 2025
7 mins
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Our first community hour: Building together

We just hosted our first Community Hour, a new regular virtual meetup for everyone building, testing, and evaluating Gen AI agents and LLM applications. Join our growing community where testing is a collaborative conversation, not an afterthought.
Dr. Nicolai Bohn
November 7, 2025
3 mins