We are also building a new workflow database to include some automation's that will handle redundant tasks (for you, not us).  This could take a year to complete (I’m working on that).  At this stage we have two database architects that need to be on the same page at all times.  Once this database (like 30 of them) is built a new interface needs to be designed, programmed, and linked to make it work.  Integration and expansion need to be considered.  On the fly changes in the unlikely event we get thought out, concise feedback from you. 

At some point our designer and programmer will have to pick up the ball from engineer, and work with developer towards a never finished product that's never really existed before.  There are a million things that can go wrong at this stage (it might not even be the same crew from the app!).  It’s not like programmer can just call architect to understand what he is looking at, and if he could odds are the architect wouldn’t recall (sound familiar?).  

Using slack is like having the ability to transfer one person’s brain to another, which enables faster, more efficient progress.  If my programmer has a question, he can just search for it in the appropriate thread.  Even if I wasn’t involved in the conversation, the answer is still there.  As we build our full-time employee resources, they will have a database of knowledge and understanding to start with, minimizing our on-boarding process.    

Trello is pretty versatile.  You create a ‘board’ (up to 10 at a time w/ the free version) and within those boards you make ‘lists’.  Within those lists you make ‘cards’.  Cards contain titles.  From there you can add detailed descriptions (purpose of the card), checklists, labels, attachments, and so on.  It can be as little or as much as you want, but the hierarchy should be intuitive.  

My board relating to the app tracks progress of tasks required for release.  There is a ‘To Do’ list, ‘Issues’ and so on until the ‘Done’ list.  When there is nothing ‘to do’ and no (pre-release) ‘issues’ I will archive this board (only two left!).  It will disappear from my view, but everything discussed will be available.  So, when we get working on the first round of updates (already 4 on the list) in 6 months everything we otherwise forget as humans can be recalled.  

Where do I keep notes on future updates?  Trello- Future Updates board.  Here I use the lists for segmentation instead of progress.  Some examples of these lists include the app, search capability, data enhancement (we forgot about OSHA and DOT data for almost a year), and partnership opportunities.  

There is a lot of overlap between these two tools.  You’ll probably find that one tool does not fulfill all needs, despite the fact that two or more tools will fulfill a majority of the same needs.  For our purpose Slack is a tool to manage and communicate at a macro, big picture level.  Trello being an excellent companion for granular level management.  It also helps me organize and prioritize the million little improvements that would otherwise be lost in the ether (versatility).  To illustrate, everything was great on the 17th build of the app.  But on the 18th build everything went to hell.  I messaged the entire team on Slack that everything went to hell, noted individual issues in trello, and assigned each to the appropriate party for resolution.  There's your glimpse, hope you can make something out of it.