Proton has launched Lumo for Business, a privacy-focused version of its AI assistant aimed at organizations that handle sensitive data. The new plan expands on Proton’s original Lumo assistant, introduced in July, by offering enterprise-grade privacy protections, encrypted chat histories, and compliance with European data laws.
Positioned as a confidential alternative to mainstream AI assistants like ChatGPT or Microsoft Copilot, Lumo for Business is designed for companies that require strict control over their data — such as law firms, financial institutions, and technology developers. Proton says the service combines the productivity benefits of AI with end-to-end privacy safeguards that prevent unauthorized access to user information.
According to Proton, all Lumo for Business conversations are protected by zero-access encryption, meaning the company itself cannot view or retrieve user data. Chat histories are stored locally and can only be decrypted on a user’s device using their password. Unlike many AI tools that store logs or use data to retrain models, Proton emphasizes that Lumo never retains conversation records.
The plan, priced at $11.99 per user per month when billed annually, provides access to more advanced AI models and removes restrictions on the number of daily chats. The assistant can optionally perform web searches via privacy-friendly search engines, though this feature is turned off by default to minimize data exposure.
Proton also points to its European hosting and GDPR compliance as key differentiators, arguing that its users are shielded from the types of data requests that U.S.-based services may face under government orders. The company further underscores transparency by making the Android, iOS, and web app codebases open source.
Lumo for Business adds to a growing suite of Proton tools built around privacy and encryption. In the past year, the Swiss company has released a free open-source authenticator app with end-to-end synchronization of one-time passwords and introduced an Emergency Access feature that allows trusted contacts to access accounts in critical situations.
With Lumo for Business, Proton is extending its privacy-first approach into the enterprise AI space — a market increasingly defined by tension between data utility and confidentiality. By prioritizing encryption, local control, and European legal protections, the company is positioning Lumo as a secure option for organizations wary of sharing proprietary information with large U.S.-based AI providers.
