client app management

I have membership cards for my clients with barcodes (is scanning possible?)Need a simple custom app which can track:- Fitness Assessments - input data individually for each client - The package they"re on (able to see how many sessions are left, how many weeks remaining etc..)- Able to track everything from either my mobile or PC.. maybe on a cloud?Just want it simple and not too [login to view URL] let me know your feedback and any other ideas.