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.

UndercoverGPT is an innovative online tool designed to provide users with discreet and uninterrupted access to ChatGPT, even in environments where access to AI tools is restricted or blocked, such as schools, universities, or corporate workplaces. By using stealth technology and secure access methods, UndercoverGPT allows students, professionals, and curious users to continue benefiting from the powerful capabilities of ChatGPT—such as writing assistance, coding help, brainstorming, studying, and more—without triggering administrative blocks or firewalls. The platform positions itself as a solution for those who value productivity and creativity, but find themselves in digitally controlled environments. With an emphasis on privacy and usability, UndercoverGPT empowers users to stay connected to AI-powered tools no matter where they are.

UndercoverGPT is an innovative online tool designed to provide users with discreet and uninterrupted access to ChatGPT, even in environments where access to AI tools is restricted or blocked, such as schools, universities, or corporate workplaces. By using stealth technology and secure access methods, UndercoverGPT allows students, professionals, and curious users to continue benefiting from the powerful capabilities of ChatGPT—such as writing assistance, coding help, brainstorming, studying, and more—without triggering administrative blocks or firewalls. The platform positions itself as a solution for those who value productivity and creativity, but find themselves in digitally controlled environments. With an emphasis on privacy and usability, UndercoverGPT empowers users to stay connected to AI-powered tools no matter where they are.