| Document and Entity Information | Jun. 14, 2021 |
| Cover [Abstract] | |
| Entity Registrant Name | Applovin Corp |
| Amendment Flag | false |
| Entity Central Index Key | 0001751008 |
| Current Fiscal Year End Date | --12-31 |
| Document Type | 8-K |
| Document Period End Date | Jun. 14, 2021 |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-40325 |
| 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Class A common stock, par value $0.00003 per share |
| Trading Symbol | APP |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
