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.

Top Trend Tools is your go-to destination for discovering the most talked-about and influential software shaping the future. From cutting-edge AI assistants to powerful no-code platforms, our curated directory highlights the tools making waves across industries. Whether you're a tech enthusiast, entrepreneur, or creative professional, we keep you ahead of the curve by tracking the fastest-growing, most innovative tools on the market. Explore by category, find your next favorite tool, and ride the wave of what’s trending—before everyone else does.

Top Trend Tools is your go-to destination for discovering the most talked-about and influential software shaping the future. From cutting-edge AI assistants to powerful no-code platforms, our curated directory highlights the tools making waves across industries. Whether you're a tech enthusiast, entrepreneur, or creative professional, we keep you ahead of the curve by tracking the fastest-growing, most innovative tools on the market. Explore by category, find your next favorite tool, and ride the wave of what’s trending—before everyone else does.