Should you be interested in doing so, my suggestion would be to offer an "offline" version. It could be feature-limited as follows: 1. Do not include the plan

Should you be interested in doing so, my suggestion would be to offer an "offline" version. It could be feature-limited as follows: 1. Do not include the planned online collaboration features. 2. Support only Excel, Access, CSV/TSV, and Sqlite data sources. Charge a fair one-time license fee for this, and you would create an attractive tier for individual power-users, without cannibalizing subscription sales of the "online version" for businesses and contractors who care about collaboration and interacting with large production databases. Just my $0.02.