We used Dropsource to build our native iOS PawBoost app when we did not have the resources available to contract out development or build it ourselves.
As the non-technical half of our team, I had no problem using their editor to build out the visual side of the app. You will need a developer to format your API to Swagger specifications and hook up some logic/events in the app. However, no knowledge of Swift is required.
The Dropsource platform has improved (and continues to improve) considerably since we first started using it more than a year ago. Would definitely recommend for those seeking a low cost way to validate their big idea.
Fliplet makes the creation and maintenance of apps easily accessible to anyone. It's an ideal solution for large businesses that want to build multiple apps (eg, HR, marketing, finance etc) but would struggle to keep them up to date with smart phone changes or business re-orgs. This burden is so great that typically business apps fall by the wayside and don't get used. With Fliplet - the content can be maintained by non-technical staff and software is maintained by Fliplet - which enables IT to focus on the things that are business critical