Kombo vs. Unified.to: Sync-and-Store vs. Real-Time Pass-Through (2026)

Kombo and Unified.to are both unified APIs for connecting with HR systems, but they differ fundamentally in data handling: Kombo uses a sync-and-store model, maintaining a mirrored copy of customer data in its own database, while Unified.to employs a real-time pass-through approach, executing API calls directly against the source systems without storing business data. This architectural distinction influences data freshness, compliance, and performance under AI agents, with Kombo offering advantages in repeated reads and EU-specific HR connectors, whereas Unified.to provides live data access, broader category coverage, and enhanced security by not storing customer data. Pricing models also differ, with Kombo charging per-customer connection, potentially benefiting heavy users, while Unified.to uses a usage-based model that scales with API activity. Each platform's architecture supports different use cases, with Kombo being suitable for frequent cached reads in HR-tech and Unified.to offering a more versatile solution for real-time data access across multiple categories.