Apple on Tuesday said its revenue fell 5 per cent in the first quarter, compared with US$88.3 billion ($129.4b) a year earlier.
Revenue from the maker of iPhones came in at US$84.31b, slightly higher than the company estimated earlier this month, when it warned that sales would fall to about US$84b.
Apple's warning was its first in more than 15 years. At the time, Apple chief executive Tim Cook cited a slowdown in China's economy as well as President Donald Trump's trade war for weakening iPhone demand.
Apple's stock jumped more than 4 per cent in after hours trading.
In its results, Apple said net sales of iPhones were down by US$9b compared to the same quarter last year, though net sales increased in other categories such as services, wearables and tablets. Altogether, Apple reported net income of US$19.97b for the quarter compared to US$20.01b in the same period a year earlier.