Manus is an autonomous, general-purpose AI agent developed by Butterfly Effect, a company founded in China and headquartered in Singapore. Unlike chatbots that only respond to prompts, Manus independently plans and executes multi-step tasks: it can browse the web, write and run code, analyze data, build websites and applications, and deliver finished deliverables with minimal supervision.
When a user gives a natural-language instruction, Manus spins up a dedicated cloud virtual machine equipped with tools such as a browser, code interpreter, office applications and design engines, then works through the task autonomously. The product has expanded to create presentations, websites, desktop apps, images and music, and offers integrations including a browser operator, Wide Research, Mail Manus, Slack and a developer API. It is available via web, mobile and desktop apps, with free and paid tiers and team plans with SSO.
Manus launched in invitation-only beta in March 2025 and drew significant attention as an early example of a fully autonomous agent. In April 2025 the company raised about 75 million dollars in a Series B led by Benchmark, valuing it near 500 million dollars. The company behind Monica, an earlier multi-model browser-assistant extension, Butterfly Effect was reportedly acquired by Meta in December 2025 in a deal valued in the low billions. Manus serves creators, developers and businesses seeking to automate complex digital workflows.