# epushy > epushy is a chat-style push notification service. Anyone can send a message to a channel with one HTTP request or the `epushy` CLI; people subscribe by scanning the channel's QR code in the epushy iOS/Android app (or by opening the channel page) and get a push notification. Subscribers can reply. Free, no signup needed to send to an open channel. Important for agents: messages to an open channel are public (anyone who knows the name can read them). Never put secrets in a message. Publish keys (`epk_...`) are secrets; never print or commit them. - [Full guide for AI agents](https://epushy.com/llms-full.txt): CLI, HTTP API, channel ownership, examples, limits - [Docs](https://epushy.com/docs): human-readable docs - [CLI script](https://epushy.com/cli/epushy): single-file Python 3 CLI, standard library only - [Install the CLI](https://epushy.com/install.sh): `curl -fsSL https://epushy.com/install.sh | sh` - [Privacy](https://epushy.com/privacy) - [Support](https://epushy.com/support)