Exhibit 99.1 SIMILARWEB ANNOUNCES SECOND QUARTER 2023 RESULTS Non-GAAP operating margin improved by more than 35 percentage points TEL AVIV, ISRAEL -- August 8, 2023 -- Similarweb Ltd. (NYSE: SMWB) ("Similarweb" or the "Company"), a leading digital data and analytics company powering critical business decisions, today announced financial results for its second quarter ended June 30, 2023. The Company published a letter to shareholders from management discussing these results, which can be accessed at the li ...