We have just recently released a cool new app Simple Defragmenter:
★★★ Introducing Simple Defragmenter – Simple defragmenter helps you to easily defragment your phone's storage. It can increase your phone's speed by up to 40% whitout rooting your phone. ★★★
Link to free version: https://play.google.com/store/apps/deta ... sal.defrag
Available for Android
I recommend you to download this free and awesome app.