Exhibit 15.3

April 30, 2024

CooTek (Cayman) Inc.

11F, T2, No.16, Lane 399, Xinlong Road

Minhang District

Shanghai

People’s Republic of China

Dear Sir/Madam:

We hereby consent to the reference of our name under the headings “Item 3. Key Information—Permissions Required from the PRC Authorities for Our Operations,” “Item 3. Key Information—D. Risk Factors—Risks Related to Our Corporate Structure” and “Item 4. Information on the Company—C. Organizational Structure” in CooTek (Cayman) Inc.’s Annual Report on Form 20-F for the year ended December 31, 2023 (the “Annual Report”), which will be filed with the Securities and Exchange Commission (the “SEC”) on the date hereof, and further consent to the incorporation by reference of the summary of our opinion under this heading into the Company’s registration statements on Form S-8 (File No. 333-229171) that was filed on January 9, 2019. We also consent to the filing of this consent letter with the SEC as an exhibit to the Annual Report.

In giving such consent, we do not thereby admit that we come within the category of persons whose consent is required under Section 7 of the Securities Act of 1933, or under the Securities Exchange Act of 1934, in each case, as amended, or the regulations promulgated thereunder.

Very truly yours,

/s/ JunHe LLP

Beijing Head Office

Tel: (86-10) 8519-1300

Fax: (86-10) 8519-1350

Shanghai Office

Tel: (86-21) 5298-5488

Fax: (86-21) 5298-5492

Guangzhou Office

Tel: (86-20) 2805-9088

Fax: (86-20) 2805-9099

Shenzhen Office

Tel: (86-755) 2939-5288

Fax: (86-755) 2939-5289

Hangzhou Office

Tel: (86-571) 2689-8188

Fax: (86-571) 2689-8199

Chengdu Office

Tel: (86-28) 6739-8000

Fax: (86-28) 6739-8001

Xi’an Office

Tel: (86-29) 8550-9666

Qingdao Office

Tel: (86-532) 6869-5000

Fax: (86-532) 6869-5010

Dalian Office

Tel: (86-411) 8250-7578

Fax: (86-411) 8250-7579

Haikou Office

Tel: (86-898) 3633-3401

Fax: (86-898) 3633-3402

Hong Kong Office

Tel: (852) 2167-0000

Fax: (852) 2167-0050

New York Office

Tel: (1-737) 215-8491

Fax: (1-737) 215-8491

Silicon Valley Office

Tel: (1-888) 886-8168

Fax: (1-888) 808-2168

Seattle Office

Tel: (1-425) 448-5090

Fax: (1-888) 808-2168