SMRTR ProgrammingFeb 17, 2026Daily.dev

Evaluating LLM prompts in Rails

SMRTR summary

SINAPTIA developed RubyLLM::Evals, a Rails engine for testing and comparing LLM prompts, after spreadsheet-based evaluation workflows became unmanageable. The tool lets developers test prompt configurations against curated datasets using real application data, supports multiple evaluation types including LLM-as-judge, and tracks accuracy, cost, and performance across iterations within their Rails applications.

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