Hardware Monitor

Hardware Monitor Remote

Hardware Monitor – An open letter to the user community

After exactly 14 years, development of Hardware Monitor was discontinued on June 19, 2017.

The product is still in distribution and under full support, but there will be no updates to support new Macintosh systems released in 2017 or later.

This was not an easy decision because Hardware Monitor was a very popular and very successful software product in all the years. We like to share the reasoning behind the decision to discontinue the product with the community of users and loyal customers who loved and supported Hardware Monitor for more than a decade.

Apple has made it very clear that they don't like to tolerate software products such as Hardware Monitor on the long run. They continue to establish technological barriers, both in hardware and in the operating system, to make sensor monitoring in third-party applications as difficult as possible. In addition, the computer architecture for which Hardware Monitor had been originally developed has changed significantly in the last years, so in most environments there is no longer the need to reflect sensor readings to users.


Apple began to add software-accessible sensors to Macintosh computers in August 2002. The technical specifications and known limits for each sensor location have either been published officially, or they could be determined by other means easily. Temperature Monitor, the free variant of Hardware Monitor, was released 10 months later. It become the number one system utility to detect over-temperature situations, a common issue of the PowerPC technology used at that time. Hardware Monitor was published as "pro" version of Temperature Monitor in July 2004. It supported the entire Macintosh product range and could interpret the readings of all built-in sensors with their locations and full specifications. In August 2005, the application Hardware Monitor Remote was added to collect sensor readings for a whole network of local Macintosh systems.

In January 2006, Apple began the switch to Intel processors which since then changed the situation for Hardware Monitor dramatically:

Due to this long list of obstacles continuously established by Apple, it became less and less feasible to continue development of Hardware Monitor, not only under technical, but also under economical, legal, and political aspects. Although we could resolve many of the issues of acquiring sensor readings on new hardware models each year, this wouldn't really make sense if the meaning of these values is so strictly kept under lock and key.