v3.22.1
Cover - USD ($)
 12 Months Ended
Dec. 31, 2021
Mar. 30, 2022
Jun. 30, 2021
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Annual Report true    
Document Transition Report false    
Document Period End Date Dec. 31, 2021    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2021    
Current Fiscal Year End Date --12-31    
Entity File Number 000-30414    
Entity Registrant Name ALR TECHNOLOGIES INC.    
Entity Central Index Key 0001087022    
Entity Tax Identification Number 88-0225807    
Entity Incorporation, State or Country Code NV    
Entity Address, Address Line One 7400 Beaufont Springs Dr    
Entity Address, Address Line Two Suite 300    
Entity Address, City or Town Richmond    
Entity Address, State or Province VA    
Entity Address, Postal Zip Code 23225    
City Area Code (804)    
Local Phone Number 554-3500    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers Yes    
Entity Current Reporting Status Yes    
Entity Interactive Data Current No    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 32,562,981
Entity Common Stock, Shares Outstanding   542,716,344  
Auditor Name DALE MATHESON CARR-HILTON LABONTE LLP    
Auditor Location Vancouver, Canada    
Auditor Firm ID 1173