Ember Bold font in 2016 and it was exclusively available only on the Kindle Oasis, Kindle Paperwhite and Kindle Voyage. Today, Amazon has ported over Ember Bold to the iPhone, giving readers who have vision disorders a font with more weight.
All you need to do is update the Kindle app for iPhone from the App Store and Ember Bold will be available in all of the eBooks you purchased from Amazon. This font is not for everyone, the text is really large. Still, for people who wear glasses, contacts or have other vision problems this font will be a godsend.