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Build with Cronozen

Cronozen is a vertical SaaS operating system. You don’t build from scratch — you build on top of a platform that already handles multi-tenancy, authentication, billing, and audit trails.

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What You Get Out of the Box

Multi-Tenant Isolation

Row-level data isolation, scoped database queries, center-based access control — ready from day one.

SSO & Auth

Central authentication (auth.cronozen.com), JWT tokens, actor family linking, social login (Kakao, Apple, Google).

Decision Proof (DPU)

SHA-256 hash chains for tamper-evident audit trails. Every decision is provable.

White-Label

Custom domains, branding, landing pages. Your customer sees their brand, not yours.

Billing

Toss Payments integration, subscription management, plan-based feature gating.

AI Automation

Workflow engine, pgvector embeddings, decision support with governance guardrails.

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Use Cases

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Rehabilitation & Therapy Platform

Build a center management system for rehabilitation facilities. 
What you build:        Therapy scheduling, progress tracking, parent portal
What Cronozen handles: Multi-center isolation, therapist-patient matching,
                       DPU session proof, voucher billing, parent cross-center view
Key APIs: Centers, Schedules, DPU, Membership White-label example: slowpace.co.kr — a branded rehab center platform running on Cronozen infrastructure.

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Education & Training LMS

Build HRD-Net compliant remote training or workshop management. 
What you build:        Course content, assessment design, training programs
What Cronozen handles: HRD-Net compliance (heartbeat, EMON, FDS), QR attendance,
                       DPU proof, sequential learning gates, billing
Key APIs: LMS Learning, Assessment, Attendance, EMON Compliance: 27+ HRD-Net regulatory requirements built in. EMON electronic monitoring integration included.

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Welfare Center Management

Build a welfare service management system for elderly care, disability support, or community services. 
What you build:        Service programs, case management, reporting
What Cronozen handles: Multi-project settlement, compliance monitoring,
                       consent tracking, audit trails, schedule optimization
Key APIs: Centers, Schedules, DPU, Compliance

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Partner Platform (Franchise / White-Label)

Build a franchise management platform where you onboard and manage multiple centers. 
What you build:        Partner dashboard, center analytics, custom branding
What Cronozen handles: Center provisioning, cross-center analytics,
                       revenue share tracking, white-label DNS/proxy, SSO
Key APIs: Partner, Provisioning, White-Label Config

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AI Governance Platform

Build compliance tooling for organizations using AI in regulated industries. 
What you build:        Policy management, risk assessment UI, audit reports
What Cronozen handles: DPU hash chains, 5-level governance guards, evidence lifecycle,
                       JSON-LD export, chain verification, 6W responsibility extraction
Key APIs: DPU, Compliance, Audit

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Integration Patterns

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Pattern 1: White-Label SaaS

Deploy your own branded instance on a custom domain. 
Your domain (brand.co.kr)
    ↓ CloudFlare Worker
Cronozen infrastructure
    ↓ Multi-tenant isolation
Your center's data only
Setup time: ~2 hours with the White-Label Guide

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Pattern 2: Hub Integration

Connect your existing app to Cronozen via SSO and API. 
// Your app authenticates via Cronozen SSO
const sso = await fetch('https://cronozen.com/api/auth/sso/token', {
  method: 'POST',
  headers: { Authorization: `Bearer ${opsToken}` },
  body: JSON.stringify({ targetApp: 'your-app' }),
});

// Your app calls Cronozen APIs for data
const schedules = await fetch('https://cronozen.com/api/schedules', {
  headers: { Authorization: `Bearer ${token}` },
});

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Pattern 3: DPU as a Service

Use Cronozen’s DPU engine as a standalone audit trail for your existing application. 
from cronozen import CronozenClient

client = CronozenClient(token="your-token")

# Record any decision from your app
dpu = client.create_dpu(
    content="Model v2.1 approved for production deployment",
    reference_type="ml-model-approval",
    reference_id="model_v2.1",
    tags=["ai-governance", "production"]
)

# Later: prove the decision was made and unaltered
verification = client.verify_dpu(dpu["id"])
assert verification["valid"] == True

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Getting Started

Quickstart

First API call in 5 minutes

cURL Examples

Copy-paste ready API examples

TypeScript SDK

Full client library with types

OpenAPI Spec

Import into Postman, Insomnia, or AI tools