Pay Down Calc is an open source extra-payment mortgage calculator with charts and graphs. It has a native (not quite as capable) Android version too.
The web version of Pay Down Calc was written entirely in JavaScript --just clone drop in to a web site and go. It connects to the Google Chart engine to provide the graphs.
- Annual, Monthly, One-time extra payments
- Saved time and money
- Refinance Estimates
- Cookies to remember sessions
- Estimated PMI
Note that this app is no longer being maintained.
https://play.google.com/store/apps/details?id=com.paydowncalc.app
The Android version of Pay Down Calc was written in Java. It uses AChartEngine to generate its graphs. It performs everything offline without any permissions.
- Annual, Monthly, One-time extra payments
- Saved time and money