Langfa.st vs. Hexabot

Langfa.st

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.

Hexabot

Hexabot is an open-source AI chatbot and agent solution that allows users to create and manage multi-channel, multilingual AI-powered chatbots with ease. Designed for flexibility and customization, Hexabot offers powerful text-to-action capabilities, enabling developers and businesses to tailor their bots to meet specific needs. Built by the community for the community, Hexabot empowers individuals and organizations to create innovative, interactive agents and democratizes access to AI technology.

Reviews

Reviews

Pros
ItemVotesUpvote
Works without login or API key1
Supports 50+ models out of the box1
Built-in support for variables and Jinja2 templating1
Instant response, no setup required1
Clean and distraction-free UI1
Cons
ItemVotesUpvote
No custom API key support (yet)1
Not ideal for running complex multi-turn chats1
Pros
ItemVotesUpvote
Multi-Channel Support1
Visual Editor1
Plugin System1
LLMs & NLU Management1
Multi-Lingual Support1
Knowledge Base Integration1
Cons
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