Calmly Writer may be downloaded and evaluated for free, however a license must be purchased for continued use.
There is currently no enforced time limit for the evaluation.

WindowsWindows Installer MacMac Installer
MacOS 10.12+
Mac M1Mac ARM M1 Installer
MacOS 10.12+
linux.deb x86 linux.deb ARM64 linux.rpm x86 linux.rpm ARM64 linux.tar.gz x86 linux.tar.gz ARM64

Release Notes

Windows Installation Instructions

In Windows 10, once you click on the .exe installer file, the Microsoft Defender SmartScreen may be displayed. In that case, to install the application you have to click on 'More info' and then 'Run anyway'. Windows displays this alert window when an application has not yet been installed by a minimum number of users.

Calmly Writer is a secure application and its code is signed with a digital certificate.

Microsoft Defender SmartScreen

More info about Microsoft Defender SmartScreen and how it is hurting independent developers.