OpenCATS
Mature open-source ATS for staffing agencies and HR departments
OpenCATS is one of the most mature open-source Applicant Tracking Systems available. Originally designed for the staffing industry, it has evolved into a robust solution for both internal HR departments and recruitment agencies. It is a stable, "classic" web application that provides deep functionality for managing large candidate databases.
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Features
Core Features
- ✓Candidate Database - Centralized storage for all candidate data, including resumes, notes, and activity history
- ✓Resume Parsing - Automatically extracts contact details and skills from uploaded resumes (PDF/Word)
- ✓Pipelines & Workflows - Configurable status pipelines to track candidates through the hiring process
- ✓Full-Text Search - Powerful search across resume contents and candidate tags
- ✓Calendar Module - Built-in calendar for scheduling interviews and setting follow-up reminders
- ✓Job Publishing - Tools to publish job openings to an internal career portal or external XML feeds
- ✓Reporting - Basic reporting on activity logs, placements, and pipeline health
Target Audience
- →Staffing Agencies
- →Small to Mid-sized businesses with technical IT support
- →Organizations requiring full data sovereignty
Deployment
Type: Self-Hosted
Requirements:
- • Linux server
- • Apache or Nginx
- • MySQL or MariaDB
- • PHP 7.0+
Advantages
- +Completely free with no vendor lock-in
- +Highly stable and mature codebase
- +Vast community knowledge base
- +Full control over data and customization
Limitations
- −UI is dated (Web 2.0 style)
- −Requires self-maintenance (security patches, backups)
- −Mobile experience is limited
- −Steeper learning curve for non-technical users
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Last updated: 2026