gmail
(4)
Hiver
Hiver is a customer service platform built on top of Gmail and Google Workspace. It turns shared mailboxes like support@ and sales@ into a collaborative help desk - letting teams assign emails, track status, automate workflows, and measure SLAs without leaving their inbox. Founded in 2011 (originally as GrexIt), Hiver now serves more than 10,000 organizations, including Harvard University, Flexport, and Upwork, and has expanded into AI-assisted support across email, live chat, voice, and WhatsApp.
Zuni (ZuniRemoteAI)
Zuni (by Old House Labs Inc.) is a Chrome sidebar AI copilot built for knowledge workers who refuse to leave their existing tools. Rather than forcing users into yet another chat interface, Zuni sits quietly in the browser sidebar, reads the open tab, understands the Gmail inbox, and surfaces actionable intelligence in real time. Founded in 2024 by Cambridge alumni George Seabridge and Will Taylor (a 2x YC founder), Zuni is backed by Y Combinator (S24) and offers access to the world's leading AI models — GPT-4o, Claude 3.7 Sonnet, Gemini 2.0 Flash, DeepSeek R1, and more — all in one place, without switching apps.
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.
Streak CRM
Streak is a CRM platform built entirely inside Gmail, enabling sales, recruiting, fundraising, and support teams to manage pipelines, contacts, and workflows without leaving their inbox. Founded in 2011 by ex-Googlers Aleem Mawani and Omar Ismail through Y Combinator, Streak has grown to 750,000+ users and ~$10M ARR while remaining lean (~35 employees) and profitable — having raised only $1.9M and never pursued follow-on venture funding. It is Google's G Suite Technology Partner of the Year and one of the most capital-efficient CRM companies in the market.