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I suggest https://github.com/WerWolv/ImHex instead

I really like this program's UI. I assume it's built on the textual library?

Unfortunately, my main use case for a hex editor is editing very large files (firmware images, disk images, etc.), which hexabyte doesn't seem to handle too well. For a few smaller test files I tried, it allocates memory about ~2.7x the size of the input file.

Seems to be TUI, not command-line.

Cool.

For those who didn't already know it: Emacs also has a built-in hex editor. Just visit a file and type M-x hexlify-buffer.

Light correction: hexl-mode is the hex editor proper. hexlify-buffer called by itself just does a transformation to a side-by-side hex/chars view; it doesn't set up for hex-editor navigation or transforming back to binary on save or anything like that.

it does not seem to be "command line", there are only two command line options and one of them is a config file location.

Perhaps author meant "terminal editor" or TUI?

Written in Python.

Hexabyte – A modern, robust, and extensible commandline hex editor