Lucidchart 4+

I found lucid chart while trying to find something to reconfigure space in a building already under construction and to layout existing furniture all to scale in the 4 story office building. Lucid had a pretty small learning curve and allowed us to be able to have a plan for moving into our new building on time. It also let us layout our server racks for our server room. It really is a great tool and I was able to share out the diagrams with others during the move in process so they had something to reference as furniture was coming off of trucks into our building.

I needed a tool to document my home theatre and automation wiring and devices and LucidChart was recommended by a family member who used it at work. I downloaded the app, prepared to pay for it immediately, but no option was presented in the app. When I looked on their web site, the subscription pricing options did not show a buy option, so I waited for the trial to expire. At expiration, I was pointed again to the subscription page, and finally figured out that you have to click the heading of a subscription to be offered that purchase option. Most sites simply offer a buy button for each option. Oh well. The app works pretty well with a rare glitch here and there. I'm impressed with how intuitively it positions and works around your object positioning. Given the sophistication of the app, I think their pricing is quite fair.

Although LucidChart certainly is the most complete tool for creating flowcharts, many of the premium features offered are additional aesthetics for your maps that do not contribute in terms of functionality. If you are a software engineer working with a team that needs to make huge, complex maps for your programs, definetly give this a try, if only for the feature to share the map with your teammates and work on it simultaneously.
However, if you are an individual user, there is not much LucidChart can offer you that is different from a lot of the free flowchart apps, available on the App Store alone. In addition, you do not need to create an account or share any of your personal data on these smaller apps so it is much safer for your privacy. To conclude, you will certainly find LucidChart handy, but I would try other services before considering signing up for a subscription.