imessage
(3)
Inkbox
Inkbox is the identity and communication layer for AI agents. With one API, an agent gets its own email inbox, a phone number that can call and text, iMessage, a persistent internet address for webhooks, and an encrypted credential vault with TOTP/2FA - so agents can sign up for services, receive confirmation codes, and act on context that flows across every channel. Founded in 2025 and part of Y Combinator's Summer 2026 batch, Inkbox is built by a team of MIT and Harvard-trained researchers.
Signals (YC W26)
Signals (legally Material Model, Inc.), also known as Return Signals, is a Y Combinator W26 startup building an AI-powered iMessage revenue channel for direct-to-consumer e-commerce brands. It runs two-way text conversations that check in with buyers after delivery, convert would-be returns into exchanges, and drive repeat purchases. Founded in 2025 by CEO Ilya Valmianski and Alejandro Zaniolo, the two-person San Francisco company reports roughly $30 in incremental repeat revenue per conversation and turns 70% of return intents into exchanges.
Ditto
Ditto is a Berkeley-born AI matchmaker that skips the swiping. Students text their preferences, and every Wednesday Ditto sends one curated match over iMessage - with the time, place, and coffee-date logistics already handled. Founded by UC Berkeley students Allen Wang and Eric Liu, it went viral through sorority group chats, grew to roughly 100,000 users across about ten campuses, and raised a $9.2M seed led by Peak XV. Its bet: dating apps optimize for time-on-app, but people actually want a good date in real life.