noun
appeal; persuasive power
Used especially in marketing and advertising to describe how strongly a product, message, or advertisement attracts and persuades consumers.
この広告は訴求力が高く、多くの消費者の関心を引いた。
This advertisement has strong appeal and attracted the interest of many consumers.
商品の訴求力を高
We revamped the packaging design to increase the product's appeal.
アピール is a broader term for making an appeal or emphasizing a point, whereas 訴求力 is a noun describing the inherent persuasive strength of something.
Compound of 訴求 (そきゅう, 'appeal, solicitation') and 力 (りょく, 'power, strength'). 訴求 itself is a Sino-Japanese word combining 訴 (そ, 'to appeal, sue') and 求 (きゅう, 'to seek, request').