The Nickel Tracker App lets you achieve an "envelope" budgeting system using your Android mobile device. This app is excellent for the modern budget-conscious person who wants to create and stick to a budget simply using the device that you carry with you everywhere you go. Nickel Tracker allows you to enter all of your daily, weekly and monthly expenses right into your cell phone throughout the day as you make purchases. You can enter your own specific categories to be tracked and then add your weekly and monthly limits for each category. When you reach your weekly or monthly limit in a category it turns RED, indicating your "envelope" is empty. Email yourself a monthly summary in CSV (excel/spreadsheet) format. Nickel Tracker is free and will always be free. There is no registration required.