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Cover
12 Months Ended
Dec. 31, 2023
shares
Entity Addresses [Line Items]  
Document Type 20-F
Amendment Flag false
Document Registration Statement false
Document Annual Report true
Document Transition Report false
Document Shell Company Report false
Document Period End Date Dec. 31, 2023
Document Fiscal Period Focus FY
Document Fiscal Year Focus 2023
Current Fiscal Year End Date --12-31
Entity File Number 000-56491
Entity Registrant Name ALR Technologies SG Ltd.
Entity Central Index Key 0001930419
Entity Incorporation, State or Country Code U0
Entity Address, Address Line One 9 Raffles Place
Entity Address, Address Line Two #26-01 Republic Plaza
Entity Address, City or Town SINGAPORE
Entity Address, Country SG
Entity Address, Postal Zip Code 048619
Entity Well-known Seasoned Issuer No
Entity Voluntary Filers No
Entity Current Reporting Status Yes
Entity Interactive Data Current Yes
Entity Filer Category Non-accelerated Filer
Entity Emerging Growth Company false
Document Accounting Standard U.S. GAAP
Entity Shell Company false
Entity Common Stock, Shares Outstanding 632,466,844
ICFR Auditor Attestation Flag false
Document Financial Statement Error Correction [Flag] false
Auditor Name DALE MATHESON CARR-HILTON LABONTE LLP
Auditor Location Vancouver, Canada
Auditor Firm ID 1173
Business Contact [Member]  
Entity Addresses [Line Items]  
Entity Address, Address Line One 9 Raffles Place
Entity Address, Address Line Two #26-01 Republic Plaza
Entity Address, City or Town Singapore
Entity Address, Country SG
Entity Address, Postal Zip Code 048619
City Area Code 65
Local Phone Number 3129 2924
Contact Personnel Name Mr. Sidney Chan