NARS Madly is a moderately warm-toned, medium-dark brown with a satin finish. It is a permanent blush that retails for $30.00 and contains 0.16 oz.
NARS Madly Blush ($28.00 for 0.16 oz.) is described as a "warm soft-focus seashell pink." It's a medium brown with a hint of orange and peach gold shimmer that translates as mostly a sheen when applied. I didn't really detect pink in it--perhaps if you have pink undertones, it may be more noticeable. MAC Peachtwist is less brown, redder. MAC Soft Sand is a bit browner. Illamasqua Writhe is browner and has a stronger sheen.
FURTHER READING: Formula Overview, which is a detailed review of the range as a whole.
The ultimate authority in blush, NARS offers the industry's bestselling, most iconic shades for cheeks. NARS blush delivers healthy-looking color that enlivens the complexion and provides a natural-looking flush to flatter any skin tone. Iconic shades include a range of translucent, natural tones, each with a subtle pink undertone for a natural-looking blush to highlight the complexion. Silky, superfine micronized powder pigments in matte and shimmering shades ensure irresistibly soft, blendable application. A light application of even the highest-intensity hues delivers a natural-looking flush. These soft, buildable shades deliver a wide range of effects, from ultra-sheer to powerful pops of color.