Stamp

Cover Block

Attribute	Value
Name	Stamp
Tagline	AI-native email and calendar client
Headquarters	San Francisco, United States
Founded	2024
Stage	Pre-Seed
Business Model	SaaS
Industry	HR / Future of Work
Technology	AI / Machine Learning
Geography	North America
Growth Profile	Venture Scale
Founding Team	Solo Founder
Funding Label	Undisclosed (total disclosed ~$500,000)

Links

• Website: https://askforstamp.com
• LinkedIn: https://www.linkedin.com/posts/y-combinator_stamp-ai-yc-w25-is-the-first-ai-native-activity-7295924728744001536--nfg

What an Investor Needs First

Stamp is a Y Combinator-backed startup building an AI-native email and calendar client, positioning itself as a potential second brain for professionals overwhelmed by inbox volume [Y Combinator, 2025]. The company, founded in 2024 by solo founder Archit Mehta, aims to automate core email workflows by replying in the user's voice, prioritizing items, and tracking action items [Y Combinator, 2025].

Mehta's background includes prior work at Stripe and education at Cornell University [RocketReach, 2026] [LinkedIn, 2026]. The company is at a pre-seed stage, having participated in Y Combinator's Winter 2025 batch, which typically includes a $500,000 investment [Extruct AI, 2026].

As a SaaS business targeting individual professionals, Stamp's primary challenge will be proving that its AI-driven automation delivers sufficient user value to command a premium in a crowded, low-switching-cost market. Over the next 12-18 months, key signals to monitor include the launch of a public beta, the disclosure of initial user traction, and any expansion of the founding team.

Data Accuracy: YELLOW -- Core company description and YC participation confirmed by primary source; founder background and funding details partially corroborated by secondary databases.

Inside the Company

Stamp was founded in 2024 by Archit Mehta, a solo founder who previously worked at Stripe [RocketReach, 2026] and attended Cornell University [LinkedIn, 2026]. The company is headquartered in San Francisco and operates as a SaaS business in the productivity software space. Its primary public milestone to date is acceptance into the Y Combinator Winter 2025 batch, which included a standard investment of $500,000 [Extruct AI, 2026].

The company's launch was announced via a Y Combinator LinkedIn post in early 2025, positioning Stamp as the "first AI-native email client" [Y Combinator, 2025]. As of the latest public information, the team consists of a single employee [Y Combinator, 2025].

Data Accuracy: YELLOW -- Founder and accelerator details are confirmed by Y Combinator and LinkedIn, but team size and funding specifics are based on a single source.

Under the Hood

The product proposition is an email and calendar client built from the ground up to be managed by an AI agent. According to its Y Combinator launch materials, Stamp is designed as a "second brain" for professionals, automating the core, time-consuming workflows of email management [Y Combinator, 2025].

Its stated capabilities are centered on four interconnected functions: automated replies, inbox prioritization, action item tracking, and inbox organization [Y Combinator, 2025]. The underlying technology stack is not publicly specified; the company's description emphasizes the integrated, agentic nature of the product.

Data Accuracy: YELLOW -- Product claims sourced solely from the company's Y Combinator launch page; no independent third-party reviews or detailed technical disclosures are available.

Market Research

The market for AI-native productivity tools is seeing a surge of venture interest. The global email client market was valued at approximately $2.5 billion in 2023, with a projected compound annual growth rate of 8.2% through 2030. A more analogous market is the AI in the workplace sector, which PitchBook estimates could exceed $50 billion in addressable spend by 2027 [Grand View Research, 2023] [PitchBook, 2024].

Demand drivers include the volume of business email, with the average office worker receiving over 120 emails per day [Radicati Group, 2024]. The broader tailwind is the enterprise adoption of generative AI, with Gartner reporting that over 55% of organizations are piloting or have adopted such tools for employee productivity as of late 2024 [Gartner, 2024].

Metric	Value
Email Client Market (2023)	$2.5B
Projected CAGR (2023-2030)	8.2%
AI in Workplace Addressable Spend (2027 est.)	$50B

Data Accuracy: YELLOW -- Market sizing relies on analogous third-party reports; specific TAM for AI-native email is not confirmed.

Competition and Substitutes

Stamp enters a crowded productivity software market, positioning its AI-native architecture as a direct challenge to established email clients and a new generation of AI-first assistants. Premium clients like Superhuman and Shortwave target power users, while general-purpose apps such as Spark and Front cater to teams. A distinct adjacent category includes AI agents and copilots from companies like Notion and Microsoft Copilot.

Stamp's stated edge is its foundational AI integration, which it claims automates tasks like replying and prioritization from the ground up [Y Combinator, 2025]. The company's most significant exposure is its lack of distribution and the need to convince users to switch from deeply embedded platforms like Gmail or Outlook.

Data Accuracy: YELLOW -- Competitive positioning is sourced from the company's Y Combinator page and general market knowledge.

Opportunity

If Stamp executes on its core premise, the opportunity is to capture a material share of the global email client market by automating the administrative overhead of professional communication. The evidence that this outcome is reachable lies in the persistent, unsolved pain point of email overload and the demonstrated willingness of professionals to pay for marginal time savings [Y Combinator, 2025].

Scenario	What happens	Catalyst
Premium Prosumer Adoption	Stamp achieves viral, bottom-up adoption among individual executives, founders, and investors.	A successful public launch and integration with key calendar services.
Enterprise Land-and-Expand	Stamp sells into tech-forward companies as a departmental tool for sales and recruiting teams.	Securing a flagship enterprise customer with a high-volume, external-facing team.

Data Accuracy: YELLOW -- Opportunity framing relies on market analogies and the stated product premise from the YC page.

Sources

1. [Y Combinator, 2025] Stamp: The AI Secretary for Email and Calendar. | https://www.ycombinator.com/companies/stamp
2. [Extruct AI, 2026] YC W25 Companies (Winter 2025): Complete 163-Startup List | https://www.extruct.ai/ycombinator-companies/w25/
3. [RocketReach, 2026] Archit Mehta Email & Phone Number | Stamp AI (YC W25) CEO and Founder Contact Information | https://rocketreach.co/archit-mehta-email_369483538
4. [LinkedIn, 2026] Archit Mehta - Stamp | LinkedIn | https://www.linkedin.com/in/archit-mehta-215437183/
5. [Grand View Research, 2023] Email Client Market Size, Share & Trends Analysis Report | https://www.grandviewresearch.com/industry-analysis/email-client-market-report
6. [PitchBook, 2024] Generative AI in the Workplace: Market Sizing and Forecast | https://pitchbook.com/news/reports/q2-2024-generative-ai-in-the-workplace-market-sizing-and-forecast
7. [Radicati Group, 2024] Email Statistics Report, 2024-2028 | https://www.radicati.com/wp/wp-content/uploads/2024/03/Email_Statistics_Report_2024-2028_Executive_Summary.pdf
8. [Gartner, 2024] Gartner Survey Reveals 55% of Organizations Are Piloting or Have Adopted Generative AI | https://www.gartner.com/en/newsroom/press-releases/2024-09-18-gartner-survey-reveals-55-percent-of-organizations-are-piloting-or-have-adopted-generative-ai
9. [Crunchbase, 2024] Superhuman Company Profile & Funding | https://www.crunchbase.com/organization/superhuman
10. [The Information, 2021] Superhuman Valued at $1.3 Billion in New Funding Round | https://www.theinformation.com/articles/superhuman-valued-at-1-3-billion-in-new-funding-round
11. [The Information, 2023] How Front Built a $1.7 Billion Business on Shared Inboxes | https://www.theinformation.com/articles/how-front-built-a-1-7-billion-business-on-shared-inboxes