ApplicantStack offers a tracking and onboarding system for online job applications which helps in recruiting and hiring new employees. This system features document management, job template library, candidate profiles, and status tracking. ApplicantStack offers 3 paid plans with different limits for recruiting and onboarding. The API offered by ApplicantStack can be integrated with Human Resource Information Systems or payroll systems. This API is REST based, uses JSON for data exchange, and API Keys and Tokens for authentication.