Exhibit A

JOINT FILING AGREEMENT

The undersigned agree that this Amendment 1 to the Schedule 13G dated August 14, 2026 relating to the Class A Common Stock, par value $0.0001 per share, of Appian Corporation shall be filed on behalf of the undersigned.

 

  RPD FUND MANAGEMENT LLC
     
  By: /s/ Ahmet H. Okumus
    Name:  Ahmet H. Okumus
    Title:  Managing Member
   
   
  RPD OPPORTUNITY FUND LP
     
  By: RPD Opportunity LLC, its general partner
     
  By: /s/ Ahmet H. Okumus
    Name:  Ahmet H. Okumus
    Title:  Managing Member
   
   
  RPD OPPORTUNITY LLC
     
  By: /s/ Ahmet H. Okumus
    Name:  Ahmet H. Okumus
    Title:  Managing Member
   
   
  AHMET H. OKUMUS
     
  By: /s/ Ahmet H. Okumus