Kombo vs. Unified.to: which Unified API is better for AI-native, real-time SaaS?

June 4, 2025

Updated March 2026

Kombo and Unified.to serve different scopes of integration infrastructure. Kombo focuses on HR, ATS, and payroll systems, while Unified.to provides real-time access to structured data across SaaS systems, designed for applications that require consistent schemas and multi-source data pipelines.

Kombo is designed for integrating HR, ATS, and payroll systems. This comparison explains how Kombo and Unified.to differ in data coverage, real-time delivery, and how each platform fits into production systems.

TL;DR — Unified.to vs Kombo

When to choose Kombo vs Unified.to

Choose Kombo if:

• You are building HR, ATS, or payroll-focused features
• Your product is centered on employment data workflows
• You need deep coverage within HR systems

Choose Unified.to if:

• Your product depends on data across multiple SaaS systems
• You need real-time updates delivered from source APIs
• You are building AI features that rely on structured, cross-domain data
• You want to avoid storing customer data in a third-party integration layer

How does Kombo compare to Unified.to?

Kombo offers deep HR coverage. Unified.to supports real-time, cross-domain pipelines with normalized schemas and no data storage.

Unified.to gives you:

• Real-time updates (native + [virtual webhooks](/blog/unlock_real_time_data_with_virtual_webhooks))
• 415+ integrations across HR, CRM, ATS, Support, Marketing, and more
• Normalized schemas with passthrough + raw field support
• Database sync to Postgres, Mongo, MySQL
• Zero-data architecture: no stored tokens or payloads
• GenAI-ready tools: structured context for copilots and RAG

HR depth vs SaaS-wide breadth

Kombo focuses on HR tech: HRIS, ATS, and Payroll. It offers solid schemas and fast integration delivery inside that niche.

Unified.to supports 415+ APIs across 20 software categories:

• HR (e.g., Workday, Personio, BambooHR, Gusto, ADP, HiBob, SAP SuccessFactors)
• ATS (e.g., Greenhouse, Lever, Ashby, Workable, JobAdder, SmartRecruiters)
• CRM, Support, Repos, File Storage, Calendar, and more

You get one platform for customer, employee, and system data—streamed in real time.

Data architecture differences

Real-time by design

Kombo polls source systems every few hours and stores data in its own database. It sends webhooks when batch syncs complete.

Unified.to delivers updates using native and virtual webhooks, with data retrieved directly from source APIs instead of relying on scheduled polling.

Webhooks are configurable by object, field, and interval. You get structured events when data changes.

AI-native foundation

Kombo provides HR data to downstream AI workflows, but lacks native AI features.

Unified.to provides structured, real-time data for AI systems:

• GenAI category with prompt/model objects
• RAG-ready: pull context in real time from multiple APIs
• Stream to LLMs, vector stores, or dashboards

Fresh, structured, cross-domain data for copilots and agents.

No data stored

Kombo mirrors customer data into its own infra. Raw data access requires enabling storage of unnormalized payloads—which can include PII.

Unified.to stores nothing:

• No payloads or tokens cached
• Credentials can live in your AWS Secrets Manager
• Complies with data minimization principles

A leaner surface area for compliance-conscious teams.

Developer experience

Both platforms offer solid docs, SDKs, and a sandbox. Kombo provides a mock integration and "Kombo Connect" for auth.

Unified.to adds:

• Declarative API + OpenAPI schemas
• Fine-grained webhook config
• Sandbox + tester account
• Passthrough support and normalized schemas across every category

Faster time to value. More consistency across APIs.

What customers say on G2

G2 isn't a spec sheet, but it's a useful signal for onboarding experience, support quality, and how 'surprising' integrations are once you hit edge cases. As of January 14, 2026, Kombo is rated 4.9/5 from 60 reviews, and Unified.to is rated 5.0/5 from 23 verified reviews.

Kombo

What users like

• Very fast implementation and a developer-friendly setup experience.
• Support is repeatedly described as responsive and hands-on (including Slack-based support).
• Strong EU HR/ATS coverage and GDPR/compliance posture (DPAs called out as a plus).
• Request logs / monitoring called out as useful for tracking and troubleshooting.

What users flag

• Some smaller ATS/HR systems are missing, though teams note Kombo will add systems when there's a real need.
• Provider-to-provider mapping differences still surface in edge cases (a reality of unified HR data), sometimes requiring custom handling.
• A few reviewers describe 'lock-in' to Kombo's normalized dataset, plus occasional bugs or slow load times.

How to interpret this: Kombo's reviews read like a strong choice when you're specifically focused on HRIS/ATS in Europe and you want a vendor that's tightly aligned to GDPR expectations. Unified's reviews line up with a platform built for broader, production-grade integration infrastructure (multi-category, real-time delivery patterns, and strong observability), which matters once integrations become a core product capability.

Key takeaways

• Kombo focuses on HR, ATS, and payroll integrations
• Unified.to provides real-time access to structured data across SaaS systems
• HR-focused APIs are suited for employment workflows, not multi-system pipelines
• Unified.to supports AI features that require consistent, cross-domain data

If you're building HR-specific features and don't need real-time, Kombo is strong.

But if you're shipping AI-native SaaS and need immediate access to structured data across business systems—Unified.to is built for it.

Try Unified.to free for 30 days or book a demo to move faster with live integrations.