Re:Show HN: A web-based Excel/Database hybrid
by sidmalanado on Monday December 10, 2012 @09:13AM
(#4899034)
You could generate a unique key for each visitor as a sandbox user and then give the prompt to convert to a full account once the user has started interacting with the site. Be sure to make it non-intrusive though.
See how they have done it on https://hollyapp.com/
It took me a while to find that link again, but I thought it was worth it as an example.
Good luck.
The original page is here: http://www.ragic.com/intl/en/registerSandbox
For people who would like to use the sandbox instead.