Balsio is a work chat and productivity app for modern teams and professionals, built and hosted in Europe by Fyello Productivity SIA. It helps people start work conversations using email rather than phone numbers, supporting focused one-to-one chats, project group chats, and communities organized around industries, events, or shared interests. Users can share files and links, reply in threads, organize conversations into custom lists, schedule messages, and access full chat histories across devices. Inbox tools help users clear completed chats and focus on conversations that still need attention.

Balsio is available for Mac, Windows, iPhone, iPad, and Android, as well as in a web browser. The service also offers integrations through a REST API, real-time events, and MCP, enabling tools such as Claude and ChatGPT, scripts, and AI agents to read inboxes or post to conversations. A feature for messaging WhatsApp contacts from Balsio is listed as coming soon, with end-to-end encryption and availability across the European Economic Area.