startup-tools
(6)
BOND
BOND is a San Francisco startup building Donna, an AI Chief of Staff for CEOs, founders and busy executives. Donna plugs into the tools a company already runs on - Slack, Gmail, Notion, Linear, Jira, Asana and more - learns how the organization actually works, and surfaces the highest-leverage moves: what shipped, who is blocked, and the top priorities for the day. Founded in 2025 by Chloe Samaha and Rene Sultan and backed by Y Combinator's X25 batch, BOND aims to give every founder an executive right hand that used to cost a six-figure salary.
Kite
Kite is a screen recorder that turns raw product demos into polished, Apple-style marketing videos in minutes. Built by Y Combinator S23 founders Derek Feehrer and Todd Ashley, it uses WebGL and AI to automatically add cinematic cursor zooms, 3D device mockups, animated text, AI voiceovers and music - letting founders and marketers produce professional launch and feature videos without an editor or motion-graphics skills.
Letterbook
Letterbook is an AI-native customer support platform built for startups and lean teams. It connects to a company's inbox, database, and Stripe, then uses AI to triage tickets, draft resolutions, and build a knowledge base - all reviewed by a human before sending. Founded in 2023 by Dawson Chen and Ethan Hou and backed by Y Combinator (S23), it positions itself as the modern alternative to Zendesk, Freshdesk, Intercom, and Front.
Quota Lab, Inc.
Quota Lab, Inc. is a Seoul-based fintech company behind QuotaBook, a cloud equity-management platform that digitizes cap tables, stock options, RSUs and fund reporting for startups and investors. Founded in 2019 by former venture capitalists and graduated from Y Combinator's Winter 2021 batch, it has become the default equity-management infrastructure for a large share of Korean startups and VC funds, and is often described as the 'Carta of Asia.'
Warp
Warp is an AI-native payroll, compliance, and benefits platform built for high-growth startups. It automates the back-office grind - multi-state tax registrations, filings, benefits enrollment, global contractor payments, and compliance-notice resolution - so founders can hire, onboard, and pay teams anywhere in the US and 150+ countries without the manual admin. Backed by Y Combinator and Sound Ventures, Warp has raised about $24-25M to build what it calls an autonomous back office.
Pump.co
Pump.co is a San Francisco-based AI cloud platform that pools AWS commitments across hundreds of startups to deliver enterprise-grade discounts - up to 60% off - with no engineering work or long contracts. Founded in 2022 and backed by Y Combinator, it has grown into a multi-product 'intelligent cloud' covering cost optimization, visibility, and security.