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That doesn't matter at all. First, there's always some obscure Linux tool with the same name, simply because Linux has a long history, and good names are the ones taken first, even when they're totally unrelated to their task (gnome, thunderbird, apt, to mention a few).

Second, the name will not confuse anybody. 99.99% of the target audience will not have heard of the linux tool, and the ones that have will not thing "zsync.com, I bet that's going to be a site about diff transfers optimized for network load".

I'm def not attached to the name, was just the best I could think of with a domain available. Can brainstorm others / open to ideas. Thanks for the feedback.

It's also very close to zksync

I agree. The name sounds like a toolbox.

Strongly concur. I really wanted this to be a `rsync` work-alike with `zstd` features built in.