Apple’s Limited Warranty generally does not cover accessories such as screen protectors against accidental damage, including cracks that develop during use. Purchasing a screen protector from an Apple Store does not automatically mean that it is covered by Apple’s warranty.
Apple’s warranty primarily covers manufacturing defects in the eligible product and does not ordinarily cover physical damage to accessories. Therefore, if your screen protector has developed a crack, its replacement may not be covered under Apple’s Limited Warranty, even if you purchased it directly from an Apple Store.
However, the outcome may depend on the brand of the screen protector, its individual warranty terms, and the circumstances in which the crack developed. If you believe the crack resulted from a manufacturing defect rather than an impact or accidental damage, contact the Apple Store where you purchased it to check whether the accessory is eligible for replacement under its own warranty or return policy.