Oppenheimer is a cross-model comparison desktop tool that lets users interact with multiple AI assistants side-by-side. Designed to boost productivity and prompt testing, the app enables simultaneous input to tools like ChatGPT, Gemini, Bing, and Google Search—all from one clean interface. It’s built to run directly from your Mac menu bar and supports standalone windows for easy multitasking. With a Pro version offering unlimited panels and OTA updates, Oppenheimer is perfect for those who frequently explore or compare outputs from different large language models. Whether you’re writing, researching, coding, or just experimenting, Oppenheimer makes AI comparison seamless and fast.
| Oppenheimer Review Summary | |
| Performance Score | A |
| Content/Output | Real-Time & Comparative |
| Interface | Lightweight & Multi-Panel |
| AI Technology |
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| Purpose of Tool | Compare multiple AI model outputs side-by-side in real time |
| Compatibility | Desktop (macOS) |
| Pricing | Free plan + One-time Pro plan at $4.99 |
Who is Best for Using Oppenheimer?
- Developers: Test prompt variations across AI models quickly to refine logic and improve app integrations or chatbot quality.
- Writers and content creators: Compare tone and language across tools like ChatGPT and Gemini for better copy outcomes.
- Researchers: Use Oppenheimer to validate facts and perspectives from multiple LLMs without toggling between apps.
- Prompt engineers: Rapidly A/B test prompt structure, tone, and context across models in a single streamlined workflow.
Oppenheimer Key Features
| Side-by-Side AI Comparison | Menu Bar Access | Unlimited Panels (Pro) |
| Over-the-Air Feature Drops | Real-Time Multi-Model Sync | Supports ChatGPT, Gemini, Bing, Google |
| LLaMa Support Coming Soon | No Login Required | Lightweight & Fast UI |
Is Oppenheimer Free?
Yes, Oppenheimer offers a completely free version with core functionality, and a lifetime Pro license for a one-time payment of $4.99.
Oppenheimer Pricing Plans
- Basic Plan – Free: Access from menu bar, One standalone AI window, No OTA updates or bug fixes, Supports ChatGPT, Gemini, Bing, Google.
- Pro Plan – $4.99 (One-Time Purchase): Access from menu bar, Unlimited standalone windows, Over-the-air updates and bug fixes, ChatGPT, Gemini, Bing, Google side-by-side, LLaMa support (Claude coming soon), Lifetime license.
Oppenheimer Pros & Cons
Pros
- Side-by-side AI comparison
- Real-time prompt syncing
- Lightweight, easy-to-use UI
- No login required for access
- Unlimited panels in Pro version
Cons
- Free plan has limited functionality
- Requires macOS for use
- No mobile or web version
FAQs
Can I use Oppenheimer on Windows?
Currently, Oppenheimer is only available for macOS. A Windows version has not been released yet.
Do I need OpenAI or Google accounts to use it?
Yes, you’ll need your own access to each AI provider’s platform to use them within Oppenheimer.
Does the Pro plan require a subscription?
No, the Pro plan is a one-time purchase of $4.99 no recurring payments required.
