If your device starts to slow down, then you may decide to investigate how much 'cache' memory is used by each app you have recently used. The manual process of viewing each applications 'cache' in the 'device' settings.
This app automates the laborious process of checking the cache and for all your apps. After just a few seconds this app neatly displays the cache for each app in descending numerical order.
You can then clear the cache for one, several or all your apps.
In summary a simple and effective cache clearer. However if you know which app is likely to be hogging the cache then it is just as easy to do it manually. Alternatively you may decide (with caution) to power off and on your device.