Is this the official Hark app?
No. It is an independent open source project and is not affiliated with Hark. It opens the real hark.com in its own window and adds desktop features around it. Hark and the Hark logo belong to their owners.
What can the app see?
Only what a browser tab on hark.com can see. You sign in on Hark's own pages, so the app never handles your password. The Hark page can send the app a few small events, such as "show a notification", and the app checks each one before acting. It cannot read your files or run commands.
Why does my computer warn me when I open it?
The builds are not code-signed, and signing costs money every year. Windows shows a SmartScreen notice: choose More info, then Run anyway. On macOS, open the app with a right click and choose Open. You can also build it yourself from the source.
Why is it using several hundred megabytes?
Almost all of that is the web view that draws hark.com, which is the same engine your browser uses. The app itself is about 10 MB. Hark animates its background, so the page is never fully idle while the window is visible. When Hark is hidden in the tray, it settles down.
Does it update itself?
Not yet. Download a new release to update. Hark's own features update by themselves, because the app loads the live site.
How do I remove it?
On Windows, use Settings, Apps, Installed apps. On macOS, drag the app to the Bin. On Linux, remove the package or delete the AppImage.