If you’re implementing customizations in Office 365, it’s fair to say that numerous approaches exist now, and that the service has certainly been enhanced as a development platform in recent times. However, one area of potential confusion is around how apps are developed. Developers and other technical folks became used to “the app model” over the past 2 years or so, as a way of implementing custom functionality which ran on non-SharePoint servers (perhaps Azure) and called into SharePoint using remote APIs such as CSOM or REST. But since then, Microsoft have introduced new APIs and authentication models for Office 365 – these sit above the underlying SharePoint, Exchange, Lync/Skype for Business and Yammer services in Office 365, and come with some differences in how the solution must be developed.
Notably, there are also differences in how end-users access the app, and also how administrators can make the app available (e.g. to specific users) in the first place. In all this, the original app model is not going away – SharePoint apps have now been renamed to “SharePoint add-ins”, but they are still are very valid implementation choice. So technical teams working with Office 365 often have decisions to make: should a customization be implemented as a SharePoint add-in or an Office 365 app?
For me, the key is understanding the impact on the different stakeholders – end-users especially, but also administrators and developers. The last group in particular need to understand the capabilities of Office 365 apps (e.g. what the APIs can do), to decide whether the functionality needed by the business can indeed be implemented with this approach.
I presented on this topic at the SharePoint Evolutions 2015 Conference, and have now published the presentation deck and demo videos. The deck is shown below, and can also be downloaded from this link: SlideShare - Comparing SharePoint add-ins (apps) with Office 365 apps. There are 3 demo videos, and I’ve added captions to these and published them to YouTube – you can see these if you use the presentation below or obtain it from SlideShare.
Hope you find it useful!