Sigil Wen, a developer backed by several prominent Silicon Valley investors, has officially launched a new AI tool called Underdog. The assistant is designed to operate entirely on-device, a feature the company claims will ensure user privacy by keeping data off external servers. Underdog is being marketed as a direct competitor to established AI assistants such as Instinct and Muse.

According to the launch announcement, the service aims to provide a free, high-capability experience for everyday digital tasks. By processing information locally on the user's hardware rather than in the cloud, the developers argue that Underdog offers a more secure alternative to current industry standards. While the product is being framed as a significant development in the AI space, specific technical benchmarks comparing its performance to Instinct or Muse have not yet been independently verified. The launch marks a notable entry into the growing market for private, local-first artificial intelligence tools.