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.

Launch Scroll is your gateway to tomorrow’s most effective SaaS and AI tools. Designed for makers, startups, and professionals alike, our platform curates high-impact software that helps you work smarter, move faster, and scale easier. With categorized listings across dozens of industries—like marketing, education, e-commerce, productivity, and more—Launch Scroll makes it easy to find solutions tailored to your goals. From cutting-edge AI assistants to niche productivity tools, every listing is handpicked for innovation and usability. Whether you're building your first product or optimizing a growing team, Launch Scroll connects you with tools that truly deliver. Have something to share? Submit your tool and get discovered by a global network of early adopters and decision-makers.

Launch Scroll is your gateway to tomorrow’s most effective SaaS and AI tools. Designed for makers, startups, and professionals alike, our platform curates high-impact software that helps you work smarter, move faster, and scale easier. With categorized listings across dozens of industries—like marketing, education, e-commerce, productivity, and more—Launch Scroll makes it easy to find solutions tailored to your goals. From cutting-edge AI assistants to niche productivity tools, every listing is handpicked for innovation and usability. Whether you're building your first product or optimizing a growing team, Launch Scroll connects you with tools that truly deliver. Have something to share? Submit your tool and get discovered by a global network of early adopters and decision-makers.