v3.26.1
Cover
 12 Months Ended
Dec. 31, 2025
shares
Document Information [Line Items]  
Document Type 20-F
Document Registration Statement false
Document Annual Report true
Document Transition Report false
Document Financial Statement Error Correction [Flag] false
Document Shell Company Report false
Entity Interactive Data Current Yes
Document Accounting Standard U.S. GAAP
ICFR Auditor Attestation Flag false
Amendment Flag false
Document Period End Date Dec. 31, 2025
Document Fiscal Year Focus 2025
Document Fiscal Period Focus FY
Entity Information [Line Items]  
Entity Registrant Name Sentage Holdings Inc.
Entity Central Index Key 0001810467
Entity File Number 001-40580
Entity Incorporation, State or Country Code E9
Current Fiscal Year End Date --12-31
Entity Well-known Seasoned Issuer No
Entity Voluntary Filers No
Entity Current Reporting Status Yes
Entity Shell Company false
Entity Filer Category Non-accelerated Filer
Entity Emerging Growth Company true
Entity Ex Transition Period false
Entity Contact Personnel [Line Items]  
Entity Address, Address Line One 501, Platinum Tower 233 Taicang Road
Entity Address, Address Line Two HuangPu
Entity Address, City or Town Shanghai City
Entity Address, Country CN
Entity Address, Postal Zip Code 200001
Entity Listings [Line Items]  
Title of 12(b) Security Class A Ordinary Shares, par value US$0.005 per share
Trading Symbol SNTG
Security Exchange Name NASDAQ
Class A Ordinary Shares  
Entity Listings [Line Items]  
Entity Common Stock, Shares Outstanding 2,805,325
Class B Ordinary Shares  
Entity Listings [Line Items]  
Entity Common Stock, Shares Outstanding 0
Business Contact [Member]  
Entity Contact Personnel [Line Items]  
Contact Personnel Name Qiaoling Lu
Contact Personnel Email Address qllu@sentageholdings.com
Entity Address, Address Line One 501, Platinum Tower 233 Taicang Road
Entity Address, Address Line Two HuangPu
Entity Address, City or Town Shanghai City
Entity Address, Country CN
Entity Address, Postal Zip Code 200001
Entity Phone Fax Numbers [Line Items]  
City Area Code +86
Local Phone Number 21 5386 0209