Numerous apps and devices have emerged to assist meditation, as the author mentioned in his book. One of them was mentioned in this news: This headband reads your brain waves to help you meditate — here's what happened when we tried it out. Not sure if I like the idea of such technology assistance in meditation. Such technologies can actually be distracting as it was mentioned in the article:
However this downside may be fixed to some degree over time. What concerns me more is that when you let technologies mingle into your natural spiritual practices, they may weaken and corrupt the power and effect of such practices (comparing with "natural" methods), and also "mechanize" or "automate" them to a level where you may not be able or willing to exercise those practices without assistance of technologies.
Also, some of the technologies may be used to influence brain and mind to expedite effects or even cause exaggerated effects. Like for example in case of Hemi-Sync assisted practices of meditation and out-of-body experience. However, no one knows if this approach has side effects, for example some people listening to Hemi-Sync complained about headache.
I think, the effects from using such technologies must be researched more fully and objectively.