Chirpy is a macOS application that allows users to assign custom notification sounds to any app that sends notifications through the system’s Notification Center. Its primary function is to differentiate incoming alerts by their source, channel, person, or keyword, enabling users to recognize the importance of a notification without needing to look at their screen. The app is designed for macOS and works with a wide range of applications, including Slack, Microsoft Teams, email clients, calendar apps, and any other software that produces system notifications. The application offers a set of features to customize the notification experience. Users can create rules that match specific channels, direct messages, keywords, or individual contacts and assign a unique sound to each rule. Chirpy includes a library of over 72 curated sounds, from gentle bells to more playful tones, and also supports uploading custom audio files. Volume levels can be adjusted per rule. The app runs as a lightweight menu bar tool, occupying approximately 7.8 MB of disk space, and operates entirely locally without reading message content or connecting to third-party APIs such as Slack or Teams. Typical use cases involve setting distinct sounds for high priority communications, such as messages from a manager or alerts about production issues, while using different tones for lower priority channels like casual conversations. The workflow begins with downloading the application and placing it in the Applications folder. Users then grant accessibility access when prompted, and proceed to create rules by selecting a channel, person, or keyword and pairing it with a chosen sound. Chirpy offers a free three day trial, after which a one time purchase is required to continue using the application.