A desktop application (such as quickbooks) is needed for quick data entry and flexibility in case we make any mistakes.

We did not meet reserve (which we presumed we would not).  2 hrs later we were sent an email offering us an approved seller purchase price of $237,000 (+4.5% buyers premium & $299 tech fee) - they gave us 24 hrs to make decision.At this point we immediately ordered a 'desktop appraisal' - which gave us a value to the house (as is condition - which included the interior removed by angry homeowners - kitchen, baths, all lighting, etc - it was gutted - but not damaged in the process) - the appraisal came in at $300,000. 

As a result, LL may be in eviction court every other month (learn how to use the civil computers downtown to be able to tell).

there are some insurance ones that are downloadable - the data is what they often charge for - it varies by area - labor and materials - so you need to get a feel of prices for materials then for your area's labor charges and the time needed - then you can calc it out or write your own spreadsheet - using a computer mostly, I am not sure a phone app would be able to store the data needed - but you could just memorize things like the cost to gut renovate a kitchen or bath as was suggested and how much a roof or flooring costs psf

Now we have computers, so maybe you could make something similar to that, but the key is to set up the functions and elements of any process to be uniform and consistant.

I will take a look at my computer at home to see if I have the website saved.

., but there are certain aspects of property analysis that I've had to learn mostly from experience.I often think of property analysis in two ways: First is "the paper assessment" (which includes the P/L spreadsheets, the appraisal, SQ footage, data on the local market, and all other info that can be easily conveyed on paper--or at least on a computer). 

I am computer engineer by profession and started the real estate investment around 2 years back and purchased 8 rental properties mostly townhouses in the Chicago suburb.

Are you using your phone or computer?

I was thinking of some kind of flow chart, as this is what I am used to using to coordinate projects in my former career, but I used computers for this.