AI startup Photon raised $4.5 million in seed funding to help developers build agents that operate through existing messaging platforms instead of standalone mobile apps. With Gradient and A* leading the investment alongside backers Vercel, HongShan, Z Fellows, Llama Ventures, and Karman, Photon eyes a strong foothold.
Co-founder and CEO Daniel Tian dropped out of UPenn’s M&T program to start the company. Co-founder and CTO Ryan Zhu left high school and became a visiting student at MIT’s Media Lab. Tian built the original tool as a bot that texted friends as him over iMessage. When the team released it on GitHub, thousands of developers adopted the open-source version, which still accounts for 98% of current usage.
Photon provides a unified API, an extensible channel framework, a command-line interface, and an observability suite. Developers use these tools to deploy AI agents across iMessage, WhatsApp, Telegram, SMS/RCS, email, and voice channels. The platform delivers messages in under one second through its edge network and maintains 99.95% uptime with SOC 2 Type II and HIPAA compliance.
The startup attracted over 40,000 developer sign-ups and grew revenue 10x in four months. Messaging volume jumped 5x in the last month alone, and the company reports a churn rate below 3%. Customers include Corgi Insurance, dating platform Ditto, business banking provider Rho, and AI email client Slashy.
On September 17, 2026, Photon held an actual funeral in San Francisco for mobile apps, complete with speeches, panels, and a coffin containing app icons.
The event doubled as a developer day featuring speakers from Vercel, Stripe, and OpenAI. Tian said the shift from apps to agents “is directionally inevitable,” though he acknowledged “it’s going to take a while.”
