GitHub Chat vs Second Brain vs ChatBetter: Which AI Chat tool is Best in 2025?

GitHub Chat is a free AI-powered Chrome extension launched by Bluera Inc. in 2025, designed to enable real-time conversations with GitHub repositories, files, wikis, or documentation. By integrating directly into GitHub’s interface or via githubchat.ai, it leverages advanced AI to provide instant answers about code, READMEs, or project details, enhancing developer productivity. It is ideal for programmers, open-source contributors, and cybersecurity researchers, it streamlines code comprehension and project navigation. Its intuitive interface, robust features, and ethical design make it essential for open-source contribution, code debugging, and cybersecurity research. By using GitHub Chat responsibly, users can accelerate their workflows, deepen code understanding, and excel in technical projects.

Second Brain is an innovative AI-powered platform designed to revolutionize personal knowledge management, research, and task execution for solopreneurs, developers, and productivity enthusiasts. Unlike traditional note-taking apps like Notion or Obsidian, Second Brain integrates advanced AI chat capabilities, visual boards, and seamless data capture to organize ideas, streamline workflows, and deliver actionable insights from diverse sources like PDFs, videos, and web content. With its Chrome extension and tailored features for niche coding or business strategy, it empowers users to save time and boost efficiency.

ChatBetter is an innovative AI platform that allows users to interact with multiple leading AI models, such as those from OpenAI, Anthropic, Google, xAI, DeepSeek, Meta, Perplexity, Mistral, and Cohere, all within one chat interface. It automatically selects the best model for each query, enabling users to compare responses side by side and chain models for complex tasks like research, planning, and content creation. It also offers team collaboration tools, enterprise security with single sign-on (SSO), and data connections with tools like Databricks and Google Drive.