Hello, i have written a few android apps for myself which could be used by other people, see below:
Money But Daily
It is a money web app which allows you to spread expenses out over the 'effective' period. For example car insurance is usually yearly but the 'cost' of it shouldn't all occur on the day you bought it.
There is an android app downloadable from my CDN
The web site is static-ly hosted in AWS S3 and the login credentials are just the AWS API credentials which you can create to your own bucket