AI Models Tester – Compare multiple AI models with live previews

Summary: AI Models Tester is a free browser tool that runs the same prompt across multiple AI models simultaneously, displaying side-by-side outputs in various formats while tracking API costs. It enables quick comparison of model responses without signup or backend setup.

What it does

The tool lets users enter a prompt, select AI models, and run tests to view comparative results instantly in raw text, Markdown, HTML, or JSON formats. It tracks token usage and API cost per model, showing outputs side-by-side for easy analysis.

Who it's for

It is designed for developers, prompt engineers, product teams, and AI researchers who need to evaluate, benchmark, or optimize multiple large language models efficiently.

Why it matters

It solves the manual, repetitive process of testing AI models separately by providing a streamlined, cost-aware, and visual comparison in one interface without requiring account creation.