SSDReporter is an application that checks the health of your internal Solid State Disks ("SSD" aka "Flash Storage"). Since SSDs have a limited life-time determined by the number of write operations it is important to keep an eye on your SSD status. SSDReporter can warn you by e-mail or on-screen each time the health of your SSD decreases and/or when the health falls below the 'warning' or 'error' thresholds.
The current status of your SSDs is also always easily recognizable because SSDReporter changes its icon (optionally in the menubar) from green to yellow (warning threshold) and finally red (error threshold) as the SSD health decreases.
Limitations & Compatibility:
Only 'internal' SSDs are supported, disks connected via USB/FireWire/etc do not work at all with SSDReporter.
Some SSDs do not support S.M.A.R.T. at all and therefore do not work with SSDReporter:
the SSD built into the 2015 12" MacBook is incompatible (Apple may provide compatibility in a system update)
the "OWC Aura SSD for Mac Pro" is incompatible
Some SSDs report health attributes in offline mode which is incompatible with OS X and so don't work with SSDReporter:
a few 2013 and 2014 MacBookAir models contain incompatible 'TOSHIBA' SSDs (APPLE SSD TS0128F/TS0256F)
all 'Micron' and 'Crucial' SSDs are incompatible
most 'OWC' SSDs models including the MERCURY ELECTRA are incompatible
most 'OCZ' SSDs models including the ONYX, AGILITY4, VECTOR, &VERTEX3/4/450/460 are incompatible
Mac OS X "Mavericks" 10.9 or later
At least one compatible internal "Solid State Disk" (SSD) or "Flash Storage" disk