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Popular defrag programs work great for both operating systems. All modern popular file systems fragment despite marketing materials. Give it a try sometime to see for yourself.
We should be clear that defragmenting programs not only make clusters contiguous, they also put partnering files close to each other on the disk. This is not something handled well by either OS under high disk activity.
What I meant by "both operating systems" was Windows and OSX. There is no need to defragment the iPad or iPhone because they use a type of flash called NAND. That doesn't suffer from the same fragmentation issues as a spindle media like hard disks do.