Capsomnia

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Caps Lock keeps your Mac awake, even with the lid closed
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capsomnia.com/
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What is Capsomnia?

Capsomnia is a free, open-source macOS app that turns the Caps Lock key into a physical anti-sleep switch, allowing your MacBook to stay awake and continue running background tasks even when the lid is closed.

Caps Lock keeps your Mac awake, even with the lid closed

Core Features
Toggle sleep prevention by pressing Caps Lock
Caps Lock LED indicator shows anti-sleep status
Works with lid closed for uninterrupted background tasks
Customizable hotkey if Caps Lock is already in use
Open source under MIT license with transparent security model
Supports macOS 14+
Popular Use Cases
  • Keep AI agent tasks (Codex, Claude Code) running with lid closed
  • Maintain SSH sessions without device sleep
  • Complete long builds and large downloads
  • Keep mobile coding sessions (Codex Mobile) connected
Feature Comparison
A functional comparison based on maker input.
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Comparison details are provided for informational purposes and should be verified with the official website.
How to use
  • Download and install Capsomnia from the official website or GitHub.
  • Open the app; it runs as a menu bar application.
  • Press Caps Lock to enable anti-sleep mode (LED lights up).
  • Close your MacBook lid; tasks continue running.
  • Press Caps Lock again to disable anti-sleep and restore normal sleep behavior.
  • Optionally configure a custom hotkey in settings if Caps Lock is used for other functions.
Pricing
Capsomnia uses a Free pricing model. Pricing and features may change over time.
Free
$0
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Pro
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Team
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Enterprise
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Deal / Coupon
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