The short version: LoopCast isn’t signed with a paid developer certificate yet, so your computer can’t confirm who made it. That’s why you see a warning. It doesn’t mean the app was checked and found to be harmful. If you’d rather not install anything, open LoopCast in your browser instead.

Why the warning appears

Microsoft and Apple let developers “sign” their apps with a certificate that proves who published them. Certificates cost a yearly fee and require identity checks. LoopCast doesn’t have one yet.

When an app isn’t signed, Windows and macOS can’t confirm the publisher, so they stop and ask you before it runs the first time. That’s a reasonable default: it protects people from apps they didn’t mean to install. After you’ve allowed LoopCast once, it opens normally.

What it does and doesn’t mean

It means your computer doesn’t know who published the app.
It doesn’t mean Windows or macOS scanned LoopCast and found a problem. Your antivirus and your computer’s built-in malware protection still check it like any other app.
It doesn’t change how LoopCast works once it’s open.

What LoopCast does on your computer

It plays files from the folder you choose. It doesn’t read files anywhere else.
It works offline. It doesn’t upload your files or send anything about you anywhere.
It only turns on a camera or capture device when you choose Find inputs. On a Mac, macOS asks your permission first.
On Windows it installs for your user account only and doesn’t need administrator rights.

Stay safe

Only download LoopCast from loopcast.space. The files are named LoopCast-Setup.exe (Windows) and LoopCast-Mac.dmg (Mac).
If you get LoopCast from anywhere else, like an email attachment or another website, don’t open it.
If your organization manages your computer, ask your IT team before installing. They can allow it, or you can use the browser version.

Installing on Windows

Download LoopCast-Setup.exe. If your browser says the file isn’t commonly downloaded, choose Keep (in Edge, open the … menu next to the download, choose Keep, then Keep anyway).
Open the file. If a blue window says “Windows protected your PC,” choose More info, then Run anyway.
Follow the installer. LoopCast opens when it’s done and appears in your Start menu.

To uninstall, go to Settings › Apps › Installed apps, find LoopCast and choose Uninstall.

Installing on a Mac

Download LoopCast-Mac.dmg, open it, and drag LoopCast into your Applications folder.
Open LoopCast from Applications. macOS will say it can’t verify the app. Choose Done (or OK).
Open System Settings › Privacy & Security, scroll down to the Security section, and choose Open Anyway next to the message about LoopCast. Enter your password if asked.
Choose Open to confirm. From then on, LoopCast opens like any other app.

On macOS 14 or earlier you can also Control-click LoopCast in Applications, choose Open, then choose Open again.

To uninstall, drag LoopCast from Applications to the Trash.

Prefer not to install?

The browser version is the same player and needs no install or security prompts. The desktop app adds a few conveniences, like opening the projector window fullscreen on its own. Open LoopCast in your browser.

About the security warning.