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frp vs Carabiner: catalog facts
frp	Carabiner
Free The open-source software is available without a license fee. Hosting, hardware and…	Free Free and open source under GPL-3.0-or-later.
Windows, macOS, Linux, Command line	Linux
Connects a client behind NAT with a reachable server.	Supports HTTP, UDP, and TCP services Works with Ngrok, Playit, and Cloudflare tunnels
Requires configuring a server and protecting exposed services.	Linux only
Downloadable app	Downloadable app
Open source	Open source
License: Apache-2.0	License: GPL-3.0-or-later
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked October 8, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.