Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2025	May 05, 2025
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2025
Document Transition Report	false
Entity File Number	001-41740
Entity Registrant Name	Apogee Therapeutics, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	93-4958665
Entity Address, Address Line One	221 Crescent St
Entity Address, Address Line Two	Building 17
Entity Address, Address Line Three	Suite 102b
Entity Address, City or Town	Waltham
Entity Address State Or Province	MA
Entity Address, Postal Zip Code	02453
City Area Code	650
Local Phone Number	394‑5230
Title of 12(b) Security	Common Stock, par value $0.00001 per share
Trading Symbol	APGE
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Central Index Key	0001974640
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2025
Document Fiscal Period Focus	Q1
Amendment Flag	false
Voting Common Stock
Entity Common Stock, Shares Outstanding		46,047,416
Nonvoting Common Stock
Entity Common Stock, Shares Outstanding		13,486,642