The Ninox Apps for Mac, iPad and iPhone.
Here your data will be stored locally or in your iCloud. There is a one-time payment for the Mac App, a one time upgrade in the iPad App (only if you want to use the iCloud sync), the iPhone App is free. The Ninox App is basically for an individual user. Synchronize databases from your iCloud on up to 5 devices with the same Apple ID (requires Mac app and/or upgrade of iPad app).