Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2022	Aug. 03, 2022
Entity Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2022
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q2
Trading Symbol	QNCX
Entity Registrant Name	Quince Therapeutics, Inc.
Entity Central Index Key	0001662774
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Current Reporting Status	Yes
Entity Common Stock, Shares Outstanding		36,104,130
Entity File Number	001-38890
Entity Tax Identification Number	90-1024039
Entity Address, Address Line One	601 Gateway Boulevard, Suite 1250.
Entity Address, City or Town	South San Francisco
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	94080
City Area Code	415
Local Phone Number	910-5717
Document Quarterly Report	true
Document Transition Report	false
Entity Incorporation, State or Country Code	DE
Entity Interactive Data Current	Yes
Security Exchange Name	NASDAQ
Title of 12(b) Security	Common Stock, par value $0.001 per share
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false