Exhibit 99.1 CooTek Announces Second Quarter 2021 Unaudited Results SHANGHAI, China, September 8, 2021 – CooTek (Cayman) Inc. (NYSE: CTK) ("CooTek" or the "Company"), a global mobile internet company, today reported unaudited financial results for the second quarter ended June 30, 2021. Second Quarter 2021 Highlights June 2021 Operational Highlights "We are pleased to return to profitability while keeping a positive quarter-over-quarter revenue growth in the second quarter of 2021," commented Mr. Karl Zhang ...