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Cover - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Jan. 30, 2025
Jun. 30, 2024
Document Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2024    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-37468    
Entity Registrant Name AppFolio, Inc.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 26-0359894    
Entity Address, Address Line One 70 Castilian Drive    
Entity Address, City or Town Santa Barbara,    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 93117    
City Area Code 805    
Local Phone Number 364-6093    
Title of 12(b) Security Class A common stock, par value $0.0001 per share    
Trading Symbol APPF    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
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    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 6,634
Documents Incorporated by Reference
Portions of the registrant’s definitive Proxy Statement for the 2025 Annual Meeting of Stockholders (the “Proxy Statement”), to be filed with the Securities and Exchange Commission (the “SEC”) pursuant to Regulation 14A not later than 120 days after the end of the fiscal year covered by this Annual Report on Form 10-K (this “Annual Report”), are incorporated by reference in Part III, Items 10-14 of this Annual Report. Except for the portions of the Proxy Statement specifically incorporated by reference in this Annual Report, the Proxy Statement shall not be deemed to be filed as part hereof.
    
Entity Central Index Key 0001433195    
Document Fiscal Year Focus 2024    
Document Fiscal Period Focus FY    
Amendment Flag false    
Class A common stock      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding   23,241,750  
Class B common stock      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding   13,163,007