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Cover - shares
 6 Months Ended
Jun. 30, 2024
Aug. 07, 2024
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2024  
Current Fiscal Year End Date --12-31  
Document Transition Report false  
Entity File Number 001-41109  
Entity Registrant Name INTENSITY THERAPEUTICS, INC.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 46-1488089  
Entity Address, Address Line One 1 Enterprise Drive  
Entity Address, Address Line Two Suite 430  
Entity Address, City or Town Shelton  
Entity Address, State or Province CT  
Entity Address, Postal Zip Code 06484-4779  
City Area Code 203  
Local Phone Number 221-7381  
Title of 12(b) Security Common Stock, $0.0001 par value  
Trading Symbol INTS  
Security Exchange Name NASDAQ  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company true  
Entity Ex Transition Period false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   13,771,852
Entity Central Index Key 0001567264  
Document Fiscal Year Focus 2024  
Document Fiscal Period Focus Q2  
Amendment Flag false