3pane.com

What It Is

3Pane is an AI model comparison tool designed to solve the inefficiency of manually copying and pasting prompts across multiple models and comparing results one by one. It lets users send the same prompt to multiple AI services and view the responses side by side in up to three panels. The site is owned by Azurebits LLC, which is registered in the state of Washington, USA.

Core Features and Use Cases

Based on the crawled text, 3Pane currently supports services such as Gemini, OpenAI, Perplexity, DeepSeek, Grok, and Claude. It does not provide its own models; instead, it offers a unified interface, model selection and switching, up to three simultaneous responses, separate response-time tracking, and error isolation. Typical use cases include prompt testing, comparing model styles, researching differences in outputs across models, and observing response speeds from different services.

Pricing, API, and Privacy

3Pane itself is free to use, but users need to provide their own AI service API keys and pay the corresponding providers’ usage fees. API keys are encrypted and stored in the database, and are used only to send requests to the relevant AI services. The site states that it does not store or share prompts or responses, and that responses are discarded immediately after processing. This is a plus for privacy-conscious users, though they should still pay attention to the data policies of the third-party model providers themselves.

Pros, Cons, and Limitations

Its strengths are a clear workflow and a significant reduction in the effort needed for side-by-side multi-model evaluation. The free model also lowers the barrier to trying it. Each model panel runs independently, so an issue with one service will not affect the other results. Limitations include the fact that 3Pane does not control model quality—the output depends on the underlying model; timeouts may occur during peak periods; and comparisons are limited to three models at once. The source text does not mention a Chinese interface or Chinese-language optimization, so the Chinese experience depends entirely on the selected model.

Who It’s For and Access from China

3Pane is suitable for developers, researchers, AI enthusiasts, and users who need to compare prompts. It is less suitable for regular users who do not have API keys or who simply want an out-of-the-box chat experience. The text does not provide information about access from China, so its availability is unknown. Payment is also not described, since 3Pane is free, though third-party APIs may require overseas payment methods. Alternatives include OpenRouter, Poe, Chatbot Arena, TypingMind, and LibreChat.