Zero

Zero is an AI-native email client built from scratch to put artificial intelligence at the center of how people read, write, and manage email. Founded in 2025 by Nizar Abi Zaher and Adam Wazzan, Zero went through Y Combinator's X25 batch and raised $2M from 1984 Ventures, Pioneer Fund, and YC. The product lives at 0.email and promises to cut the time knowledge workers spend on email by 70% through smart prioritization, thread summarization, AI-drafted replies, and conversational inbox search. With over 10,000 GitHub stars on its open-source repo, Zero is one of the fastest-growing AI email projects of 2025.