fio is described as 'I/O tool meant for both for benchmark and stress/hardware verification. It has support for many different types of I/O engines, I/O priorities (on newer Linux kernels), rate limited I/O, forked or threaded jobs and much more' and is an app in the OS & Utilities category. There are more than 10 alternatives to fio for a variety of platforms, including Windows, Linux, Mac, Online / Web-based and BSD. The best alternative is CrystalDiskMark, which is both free and Open Source. Other great apps like fio are UserBenchMark (Free), AS SSD Benchmark (Free), Vdbench (Free, Open Source) and Iometer (Free, Open Source).