Zernio is a unified social media API: one programming interface that software calls to publish on many social networks, instead of integrating each network's own API. It is made by a team of 9 people in Spain, with headquarters in Girona, and was founded in 2025. It was called Late until a rebrand; getlate.dev now redirects to zernio.com.
A program sends one request, for example POST /v1/posts with text, media and a list of connected accounts, and Zernio publishes the post on the chosen networks, now or at a scheduled time; 16 networks are supported. A LinkedIn user connects a personal profile or a company page through OAuth, the login flow that grants an app access to an account. Zernio then posts at the set time, retries on failure and reports the result by webhook, an HTTP message to the developer's server. The same API answers comments and direct messages, reads analytics and runs ads on 8 ad networks. An MCP server lets AI agents call it.
Zernio is a hosted service billed each month per connected account, with every feature included; the first 2 accounts are free.