Comparing the two.

Keyclone is $20 for a lifetime license, which is good on a single computer.
IS Boxer is $36 per year, and can be used on up to 5 computers.


They both have wizards, to set up a basic configuration.
They both have maximizer/layout picture in picture.
They can both accurately broadcast keys 1:1 (send the same key to all clients).

Beyond that, IS Boxer offers:

Automatic FTL set up, no need for macros.
Instant window swap, as quickly as you can hit the keys.
Accurate and fast mouse broadcasting.
Send next click option for easy ground target spells.
Repeater regions for healing.
Keymaps, which are like hotkeys/macros but very powerful and flexible.


Coming from Keyclone...

Keyclone offers key replication.
You can blacklist certain keys so they only affect the current window.
Or you whitelist keys, so only those keys are broadcast.

IS Boxer has both Keymaps and a Repeater mode.
If both are on, Keymaps take priority.
With Repeater on and Keymaps off, it functions like Keyclone. (This is a good way to enter your password).
You can whitelist or blacklist, if you want.
But Keymaps are a far stronger option.
Most of the time, you'll want Repeater off and Keymaps on.

With Keymaps, you pick the hotkey to activate it, which windows (characters) get the hotkey, and what the mapped key does.
For example, you can send it to (windows: all without current), for independent slave movement, irregardless of the window you are in.
Or you can target members of one class only, and not others (via Action Target Groups).

Anything which is not a hotkey for a mapped key, is effectively black listed.
As in, it only affects the current window.