Killendar Download Microsoft Store KillerMCP
About

The story behind the calendar, and the field tech who built it.

The maker

"It started off as a joke. I could not think of a killer feature worth releasing it for. Then it occurred to me that being lightweight, and not wanting anything from you, might be the feature."

I'm Steve the Killer. Six years as a full-stack developer, eight years as a field technician across several companies, and now I work on an MSP's internal AI engineering team, so writing the tool I need comes as naturally to me as fixing the machine in front of me.

Killendar sat on my drive for a while as a thing I had made for myself. Every calendar I could have used instead wanted an account, and I did not want to hand a login to something whose only job is to remember that the dentist is on Thursday. So the app that had no killer feature turned out to have one after all: it does not want anything from you.

The app

Killendar is a native Windows calendar that ships as a single self-contained executable. Install it or run it portable. There is no service to register, no account, and no subscription. Hand someone the .exe and they have a calendar.

Unencrypted .kcal files can be opened with SQLite tools. Encrypted files require SQLCipher and the password. App data is processed locally, with no telemetry or automatic uploads. Update checks, downloads and network features you choose to use make external connections.

It does month, week, day and agenda views, color categories you define yourself, and iCalendar import and export so whatever you put in can come back out. Thirteen themes, twenty languages, and a keyboard shortcut for everything, because a tool you have to go looking for with the mouse costs you the time it was meant to save.

Much of what it does next will be driven by what people ask for. The GitHub issues page is open to anyone, and suggestions genuinely shape where it goes. Killendar is free software under the GPL-3.0 license, and the Technical page has the deep details.