When choosing a billing and client management platform, WHMCS gets most attention but it is not your only option.
WHMCS
The market leader. Enormous feature set, deep automation, huge add-on ecosystem. Downsides: subscription pricing at $15-50 per month, complex configuration, dated interface.
ClientExec
A leaner alternative with a simpler interface and lower entry cost at $9.95 per month. Better suited to smaller operations. Smaller community and fewer integrations than WHMCS.
HostBill
A more modern take with stronger multi-currency support and one-time pricing from $599. Smaller community and fewer tutorials than WHMCS.
MHM Theme
The fundamental difference is architecture. ClientExec, HostBill and WHMCS are standalone PHP applications that run separately from your website. MHM Theme is a WordPress theme, so your hosting business platform and your website are one unified installation. Your branding is consistent everywhere. Your content management, blogging and SEO happen in the same system you use for client management. What MHM does not have is deep automated server provisioning. For operations that provision manually or semi-manually this is not a problem.
