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Sunday

Robotics · Mountain View, United States · Founded 2024

Sunday is an AI robotics startup based in Mountain View, California, that is developing an autonomous household robot named Memo. The company was founded by Stanford Ph.D. roboticists Tony Zhao (CEO) and Cheng Chi (CTO). Their research, including breakthroughs like ALOHA, transformer adaptation for robotics, and diffusion policy, has enabled robots to learn by observing humans. The team, which has grown to over 70 engineers and researchers, includes talent from prominent tech companies like Stanford, Tesla, DeepMind, Waymo, Meta, OpenAI, and Apple. Sunday emerged from stealth in November 2025, announcing its personal robot, Memo, designed to assist families by taking over chores such as washing dishes, doing laundry, and tidying up. Instead of a bipedal humanoid design, Memo features a wheeled base for increased stability and safety, a lower weight, and is clad in a soft silicone shell. The robot stands 1.7 meters tall, weighs 77 kg, and has a telescoping column that allows its arms to reach from the floor to overhead shelves. A key differentiator for Sunday is its data collection method. The company developed the proprietary 'Skill Capture Glove,' a wearable device that records human movements as people perform chores in their own homes. This approach has allowed Sunday to build a dataset of approximately 10 million real-world household routines from over 500 homes, which trains its foundation model, ACT-1. This 'in-the-wild' data enables Memo to adapt to the unpredictable nature of home environments. The company's business model aims to make home robots accessible, with a target price point similar to a high-end smartphone or laptop, rather than a car. Sunday initially raised $35 million in a funding round led by Benchmark and Conviction. In March 2026, the company secured an additional $165 million in a Series B round led by Coatue, with participation from Bain Capital Ventures, Fidelity Management & Research Company, Tiger Global, and existing investors. This round brought Sunday's valuation to $1.15 billion. The company plans to stop giving demos and focus on deployment, with a 'Founding Family Beta' program scheduled to launch in late 2026, delivering robots to 50 selected households. Keywords: home robotics, household robot, AI robotics, autonomous robot, Memo robot, chore automation, Skill Capture Glove, physical AI, domestic assistant, machine learning, personal robot, robotic manipulation, data collection, Tony Zhao, Cheng Chi, wheeled robot, imitation learning, smart home automation, consumer robotics