They are both small, thin chili peppers, though the Siling Labuyo is the smaller of the two. Many grow to only an inch in length (max typically 1.5 inches). Siling Labuyo tend to be a little more rounded (less pointy) and a little shorter than Thai peppers. They typically mature from green to red, though there can be a wide variety of colors during their maturation journey including yellow, orange, and even a dark purple.
Their heat borders that of habanero peppers, but without the complexity of flavor. Siling Labuyo are popular in Filipino cuisine to bring a big spiciness to a meal, though they are becoming increasingly harder to source
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