# Clamshell

> A macOS menu-bar app from Epiphani Studios that keeps a MacBook running with the lid closed, on battery or plugged in, with or without an external display. $9.99 one time for every Mac the buyer uses, 7-day free trial. macOS 26 or later, Apple silicon.

- [Home](https://clamshell.epiphani.app/): what it does, pricing, FAQ, download
- [Capabilities](https://clamshell.epiphani.app/capabilities): every capability with its mechanism and how to verify it
- [Download](https://clamshell.epiphani.app/download): notarized disk image
- [Buy](https://clamshell.epiphani.app/buy): checkout (Polar, merchant of record)

Key facts: battery cutoff 0 to 100% (default 20%); stops at 45C battery temperature; 8-hour limit for a lid shut on battery (on by default); holds indefinitely on the charger; forecasts closed-lid runtime from the Mac's own measured drain; updates itself. Support: support@epiphanistudios.com