We would love to offer CardCastle for free, but supporting our team of developers/customer service staff, and keeping the servers running is quite expensive.

We believe that the best way to cover these costs is to get support directly from our users. This means that we're focussed on delivering a great experience to you, rather than just keeping you around for advertisers.
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With the Squire account, you can try out the platform for free before deciding to upgrade to Knight.