Porto's matte finish and PEI 3 specification are optimized for residential interior walls and backsplashes — the surface texture and porcelain body are designed for indoor environmental conditions. Caribbean uses a different glaze and body specification (PEI 4) that meets the additional testing thresholds for frost cycling, pool chemistry exposure, and outdoor UV. Porto is the right pick when the application is indoor; Caribbean covers the broader range.

Both are hand-craft style subway tiles with similar dimensional formats, but Porto's matte glaze is slightly more refined and quiet — closer to a soft chalk than a textured matte. The Portuguese influence reads as more restrained Old World subway, where Caribbean's Mediterranean influence carries more saturated character. Order samples of both if your project could go either way.

These are blended-color tiles — each box contains a mix of two coordinating glazes, packaged for random distribution. Install creates the layered tone-on-tone effect without requiring you to manually pull from two separate boxes. The blend is part of the design intent — don't try to sort or arrange the tiles, just install in random orientation across the field.