Spike is an AI-powered email and collaboration platform designed to help individuals and teams manage communication and work in one place. It can be used with existing Gmail, Microsoft, or other email accounts, or users can create a business email with Spike and connect a custom domain. The platform brings multiple accounts into a unified inbox and presents conversations in a chat-like format, while messages to people outside Spike remain standard email.

Its AI tools sort incoming mail, summarize unread messages and long conversations, and help draft context-aware replies. Additional inbox features include priority sorting, search, reminders, scheduling, translation, and file management. For teams, Spike offers shared inboxes, private groups, public channels, collaborative notes and documents, task tracking, and audio and video meetings. These tools support workflows for founders, freelancers, consultants, project managers, sales teams, remote teams, customer support, agencies, and HR.

Spike is available as a web app and downloadable apps for Android, iOS, Windows, and Mac.