Key features
Core capabilities each platform advertises.
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- Multi-modal synthetic testing
- Voice/text/image simulations
- Pre-production agent stress testing
- Error detection
- Automated test generation
Updated March 27, 2026
Agenta is an open-source platform for prompt engineering, evaluation, and experimentation. It provides a prompt playground, version control for prompts, A/B testing, and evaluation pipelines. Teams can iterate on prompts collaboratively, track experiments, and deploy optimized prompts to production.
Generates synthetic multi-modal user simulations to stress-test AI agents before production, catching errors manual testing misses.
Core capabilities each platform advertises.
What each tool does well, and the limitations to keep in mind.
Pros
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Respan lets you trace LLM and agent calls across any model or framework, A/B test prompts on production traffic, and route requests across 500+ models through one gateway.
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