Langfa.st is a fast and minimal playground for testing and refining AI prompts. It supports over 50 large language models, including OpenAI, Anthropic, Mistral, Cohere, Google, and others — all available instantly without setup. You can insert variables, use Jinja2 templating, and compare outputs across models. There’s no need to sign up or bring your own API keys — it works out of the box. Langfa.st was built to eliminate the friction of existing tools: complicated UIs, required credentials, or overpriced subscriptions. It gives AI teams and prompt engineers a clean, disposable space to experiment, debug, and iterate — all in one tab. Free to use. You only pay if you need more volume or power features.

Langfa.st is a fast and minimal playground for testing and refining AI prompts. It supports over 50 large language models, including OpenAI, Anthropic, Mistral, Cohere, Google, and others — all available instantly without setup. You can insert variables, use Jinja2 templating, and compare outputs across models. There’s no need to sign up or bring your own API keys — it works out of the box. Langfa.st was built to eliminate the friction of existing tools: complicated UIs, required credentials, or overpriced subscriptions. It gives AI teams and prompt engineers a clean, disposable space to experiment, debug, and iterate — all in one tab. Free to use. You only pay if you need more volume or power features.

AI Banana Image Generator Effortlessly Edit Images with Natural Language in Just 1-2 Seconds. Experience the power of cutting-edge Nano Banana AI technology, designed to revolutionize image editing and generation. Simply describe the changes you want using plain English, and the system instantly delivers high-quality results while maintaining up to 95% identity accuracy. Seamlessly create cohesive multi-image narratives, modify intricate details, or generate entirely new visuals—all without requiring traditional editing skills or software expertise. Perfect for storytellers, designers, marketers, and anyone seeking fast, intuitive image customization.

AI Banana Image Generator Effortlessly Edit Images with Natural Language in Just 1-2 Seconds. Experience the power of cutting-edge Nano Banana AI technology, designed to revolutionize image editing and generation. Simply describe the changes you want using plain English, and the system instantly delivers high-quality results while maintaining up to 95% identity accuracy. Seamlessly create cohesive multi-image narratives, modify intricate details, or generate entirely new visuals—all without requiring traditional editing skills or software expertise. Perfect for storytellers, designers, marketers, and anyone seeking fast, intuitive image customization.