Every keystroke deserves a soundtrack.
KeyCusSou plays satisfying keyboard sounds and renders beautiful visual effects as you type. Fully local — no network, no tracking, no accounts. Just you, your keys, and a little bit of joy.
Requires macOS 13.0 or later.
Features
Designed for the way you type.
Satisfying Keyboard Sounds
Play carefully crafted sound packs as you type. Choose from mechanical switches, retro typewriters, soft keystrokes, and more.
Beautiful Visual Effects
See particle bursts, ripple waves, and glowing highlights triggered by every key press — fully customizable.
Full Control
Filter which keys trigger sounds, adjust volume per effect, and save your favorite configurations as presets.
Privacy First
Everything runs locally on your Mac. No accounts, no analytics, no network calls. Your keystrokes stay private.
Screenshots
A clean, native interface.
Placeholder — will be updated soon
Main window — sound packs & visual effects
Placeholder — will be updated soon
Effects configuration panel
Placeholder — will be updated soon
Hotkey filtering interface
Ready to make typing magical?
Download KeyCusSou from the Mac App Store and elevate every keystroke.
Get KeyCusSou nowWhat people are saying
Hear from the community.
"KeyCusSou makes coding a joy. The mechanical click feels like I'm typing on a real keyboard."
Alex M.
iOS Developer
"The visual effects are subtle but delightful. I forget it's running — in a good way."
Sarah K.
Technical Writer
FAQ
Frequently asked questions.
Is KeyCusSou safe for password entry?
Yes. The app processes keyboard events transiently and never stores or transmits what you type. It respects macOS Secure Input and suspends effects in password fields when macOS reports it.
Do I need Input Monitoring permission?
No. Built-in sound previews work without any special permissions. Input Monitoring is optional and only needed if you want real-time sounds or effects while typing in other apps.
Is KeyCusSou free?
KeyCusSou offers a generous free tier with core sound packs and effects. Premium sound packs and advanced visual effects are available via optional in-app purchase. Apple handles all payments.
Where can I download KeyCusSou?
KeyCusSou is available on the Mac App Store. Check the download link above.
Privacy & Transparency
KeyCusSou runs entirely locally. It does not collect analytics, does not transmit data over the network, and does not store your keystrokes. View our full privacy policy.