Pinned App

Pinned is a Firefox extension for scheduling plans inside WhatsApp Web conversations. It is built to reduce the back-and-forth of agreeing on a time, letting a chat turn into a plan without leaving the conversation.

A floating 📌 button appears in WhatsApp Web and opens a calendar in place. From there, a date and time can be chosen, and the plan is saved per contact with multiple appointments remembered for the same conversation. The interface also includes reminders: the button turns yellow when a plan is coming up, red when it is close, and browser notifications fire one hour before the scheduled time. The flow is presented as working locally in the browser, with no account and no backend. The site also describes a live Firefox Add-ons release and says the extension is free.

The product is aimed at casual coordination in chats, including friends, family, and group chats. The page contrasts that use with professional scheduling and lists several items that are planned or coming soon, including a Chrome extension, Google Calendar sync, Gmail and LinkedIn, and mobile support. It is identified as a Firefox extension built by Nicolas, and the site name is pinnedapp.tech.