Cover Page - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Mar. 04, 2022	Jun. 30, 2021
Document Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2021
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	001-40325
Entity Registrant Name	AppLovin Corporation
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	45-3264542
Entity Address, Address Line One	1100 Page Mill Road
Entity Address, City or Town	Palo Alto
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	94304
City Area Code	800
Local Phone Number	839-9646
Title of 12(b) Security	Class A common stock, par value $0.00003 per share
Trading Symbol	APP
Security Exchange Name	NASDAQ
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 Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	false
Entity Shell Company	false
Entity Public Float			$ 15,450
Documents Incorporated by Reference	Portions of the registrant’s proxy statement for the 2022 Annual Meeting of Stockholders are incorporated herein by reference in Part III of this Annual Report on Form 10-K to the extent stated herein. Such proxy statement will be filed with the Securities and Exchange Commission within 120 days after the end of the registrant’s fiscal year ended December 31, 2021.
Amendment Flag	false
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2021
Entity Central Index Key	0001751008
Common Class A
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		297,163,913
Common Class B
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		78,662,622