Haiku, GPT mini, Grok mini) up to flagship (Claude Opus, GPT-5.4, Grok 4). Responses stream in real time, rendered in markdown. Multi-turn conversation supported so you can follow up across all three at once.

Image generation comparison Same prompt through GPT Image 1, Gemini 2.5 Flash, and Grok Imagine. The style differences between models are genuinely surprising — especially on creative prompts.

Why I built it Every AI has different strengths. Claude writes more carefully, GPT is more direct, Grok is more casual. The only way to know which one to use for a specific task is to compare them — and doing that manually across tabs is painful. This makes it instant.

Free to try — smaller models are free with no account needed. Pro unlocks flagship models and image generation.

Built with SwiftUI, Firebase Functions for streaming, StoreKit 2 for subscriptions. Happy to answer anything technical in the comments.

1d:T620,

I kept copy-pasting the same prompt into three different tabs to compare AI responses. It felt stupid so I built a Mac app to stop doing it.
Versus AI sends the same prompt to Claude, GPT, and Grok simultaneously and streams all three responses side by side as they're being generated. You see them thinking at the same time, not one after another.
Text comparison Pick any combination of models — from free tier (Haiku, GPT mini, Grok mini) up to flagship (Claude Opus, GPT-5.4, Grok 4). Responses stream in real time, rendered in markdown. Multi-turn conversation supported so you can follow up across all three at once.
Image generation comparison Same prompt through GPT Image 1, Gemini 2.5 Flash, and Grok Imagine. The style differences between models are genuinely surprising — especially on creative prompts.
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