XLL support is currently in preview mode. Builds will expire after 30 days. Things you need to know about XLL add-ins.

As XLLs from untrusted sources can be harmful, there are protection measures in place: See Microsoft's guide to unblocking XLL add-ins for instructions.

Sign in to download your add-in and for higher conversation limits.

Only your email address and name are collected.

xllify Assistant works best on desktop or tablet, where you can preview and test your functions live. You can still chat here on mobile.