Problem

Stamp addresses the growing burden of email overload: the company says the average employee spends 25% of working time buried in an inbox, while the average person receives more than 100 emails a day requiring manual action. The pain is both economic and cognitive—a recurring “second job” of reading, sorting, composing, remembering, and following up. Its killer use case is the busy professional returning to an overloaded inbox and having routine replies, priorities, summaries, action items, and scheduling work handled automatically rather than triaged one message at a time.

Product / Service

Stamp is an AI-native email client and personal secretary for email and calendar. It learns a user’s preferences through persistent memories, AI Labels, and context search across past emails, contacts, and calendar availability. It can draft replies in the user’s voice, prioritize and categorize messages, summarize emails, extract action items, search the web, perform inbox actions, and schedule events. In “Stamp Mode,” users review and approve the AI’s proposed changes, while its mobile apps let them delegate or review work on the go.

The product is delivered as a subscription software service with a 30-day free trial. The Personal plan is listed at $20 per month and the Business plan at $50 per month, with additional usage, connected accounts, profile enrichments, and team-oriented capabilities; Enterprise is sold through contact-led pricing and adds broader provider support, on-premises deployment, and white-glove migration. The intended benefit is not merely faster composition, but an inbox that increasingly operates according to the user’s own workflows and communication style.

Market

Stamp competes in the AI email assistant, AI-native inbox, productivity, and AI-agent categories. Its direct and adjacent competitive set includes AI-focused products such as Superhuman, Shortwave, Fyxer, Lindy, Inbox Zero, and SaneBox, as well as platform assistants such as Gemini for Gmail and Microsoft Copilot for Outlook. Stamp’s positioning is differentiated around the broader “AI secretary” promise: it combines voice-matched writing and inbox triage with persistent context, delegated actions, and calendar management rather than focusing only on search or drafting.

As of August 1, 2026, Stamp appears to be an active early-stage company rather than a scaled incumbent. Y Combinator lists it as a Winter 2025 company founded in 2024 and active in San Francisco; its Product Hunt page reports 258 followers and two launches. The live pricing and free-trial offer show an established path to monetization, but the public evidence reviewed does not disclose customer counts, revenue, or retention, so it is more accurate to describe Stamp as showing launch and product traction than to claim verified commercial scale or definitively label it pre-revenue.