An example is that the Voyage I have had superior lighting and blacks whereas the Oasis had gray text before
adjusting boldness.
The Oasis 2 has weak contrast and gray text without
adjusting boldness.
It allows you to
adjust the boldness of the font, the weight and a number of other options.
You can
adjust the boldness of the text with Kobo's preloaded fonts, plus you can sideload your own fonts.
Unlike the Kindle, you can sideload fonts,
adjust the boldness of the text, and set text alignment to left or fully justified.
As to boldness of the fonts you can
adjust the boldness under the font and page lining ad margin settings beneath the font choice (Georgia for example) you'll see choices, it's defaulted to «Regular» tap the down arrow and choose thicker, works well.
The user interface is clunky and slow, and there's no way to
adjust the boldness on embedded or sideloaded fonts.
Not exact matches
Adjusting the size and
boldness of a font can break up heavy paragraphs to make it more appealing and, of course, to emphasize important points.