Photon held a funeral for mobile apps. Now it has $4.5M to help replace them with agents

Photon is making a very loud bet: the app icon is on the way out, and agents are what comes next. To prove the point, the startup staged a funeral for mobile apps in a San Francisco church on September 17, complete with speeches and a coffin full of app icons.

The theatrics came with a more ordinary milestone attached. Photon has raised $4.5 million in seed funding to keep building tools for agents that run over iMessage and WhatsApp. The round was led by Gradient and A*, with Vercel also joining as a new backer alongside HongShan, Z Fellows, Llama Ventures, Karman, and other angels.

The company says its platform has already pulled in more than 40,000 developer sign-ups, turned paying, and grown revenue 10x in four months. Photon won’t give the actual revenue number, but it says churn is below 3% and messaging volume jumped 5x in the last month. The open-source version still makes up 98% of usage, which is a nice reminder that a lot of developers will happily try the free thing before they pay for the polished one.

Photon’s pitch is simple enough: users don’t want yet another app, they want an agent inside the messaging tools they already live in. So the startup is selling a stack that includes a unified API, an extensible channel framework, a CLI, and an observability suite, with support for iMessage, WhatsApp, Telegram, SMS, RCS, email, voice, and more. It also says the hosted product offers 99.95% uptime and is SOC 2 Type II and HIPAA-compliant, which matters if the company really wants into healthcare.

The customer list is already spread across insurance, banking, dating, finance, and email, with names like Corgi Insurance, Boardy, Ditto, Rho, Fliptexts, and Slashy. Photon also says its tech is integrated with Vercel, Nous Research, Tencent’s QClaw and NanoClaw, plus tools including LangChain, Mastra, Convex, Render, Railway, and Telnyx. For now, the company is focused on agents talking to humans. Next, it wants agents talking to other agents, because apparently even software now needs a phone tree.