saver

noun
1
a person who saves money and puts it in a bank, etc. for future use
پس‌اندازکننده, سپرده‌گذار
2
something that helps you spend less money or use less of the thing mentioned
صرفه‌جو, صرفه‌ساز, کاهنده
a money/time saver
Their new model of dishwasher is a great water and energy saver.
see also lifesaver, screen saver