Which app should I use?

There are three Floes and they all talk to each other, so the one you pick is about convenience rather than compatibility. Any of them can send to any other, in any direction, across different networks. If you only want one sentence: use the browser unless you need folders, a place on disk, or a script.

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Pick by what you are doing

Sending one file to someone who has never heard of Floe. Use the browser. You send them a link, they open it, and the transfer starts on its own. They install nothing and no part of the exchange needs explaining. Sending a folder. Use Floe Desktop or the CLI. The browser has no folder picker, and dropping a folder onto the page adds nothing. Both of the others walk the folder for you and rebuild the same structure on the other side. Receiving something very large. Use Floe Desktop or the CLI. A browser receiver keeps each file in memory until that file is complete, so a multi-gigabyte file can exhaust a phone or a laptop tab. The other two write straight to disk as bytes arrive and have no such ceiling. Transferring from a machine with no screen. Use the CLI. It is one self-contained binary with no runtime dependencies, and it runs anywhere Go runs. Sending regularly from Windows. Use Floe Desktop. It keeps a local history of the last 50 transfers, remembers where you save things, and can put Send with Floe in the File Explorer right-click menu.

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Feature by feature

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What is the same everywhere

These are properties of the transfer itself, so they do not change with the client you pick.

• Encryption. Every transfer runs over an encrypted WebRTC data channel. See Encryption.
• No size limit on a direct connection, and a 2 GB cap when the connection has to fall back to the relay. See File size limits.
• One receiver per transfer. A room holds exactly two peers, so while one recipient is connected, a second one is turned away.
• The sender stays connected for the whole transfer. Closing the tab, quitting the app, or stopping the process ends it.
• Versions do not need to match. A browser sender and a two-year-old CLI receiver transfer normally. See Protocol versioning.

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Mixing them

Every combination works, and neither side needs to know what the other is using. The browser speaks to the signaling server over Socket.IO while the desktop app and the CLI use a WebSocket, but both land in the same room and the server routes between them. The one asymmetry worth remembering: a browser recipient needs the link. There is no place to type a short code in the web UI, and a browser sender never mints one. Short codes are a desktop and CLI feature in both directions. When you are not sure what the person on the other end will use, share the link, because every client accepts it. See the cross-platform table for how each pairing joins.