Your Data.
Your Servers.
Run Excel calculations on your own infrastructure. Perfect for financial services, consulting firms, and any organization where data must never leave the building.
Excel Powers Your Business.
But It Doesn't Scale.
Your tax models, pricing engines, and compliance calculations live in Excel. They're trusted, audited, and battle-tested. But they're stuck on individual desktops.
Compliance Risk
Cloud solutions mean your sensitive data leaves your network
Months of Development
Rewriting Excel logic in code takes forever and introduces bugs
No Scalability
One spreadsheet, one user. Can't integrate with systems or automation
SpreadAPI Runtime:
100% On-Premises
Build your Excel services in the browser. Deploy them on your servers. No data ever touches our cloud.
Build in Your Browser
Import your Excel file. Define inputs and outputs. Test calculations. Everything stays in your browser memory.
Export Service Package
Click "Export for Runtime" to download a JSON file containing your service configuration. The file downloads directly to your computer.
Deploy to Your Infrastructure
Run SpreadAPI Runtime on your servers using Docker. Upload the service package. Your calculation API is now live—internally.
Zero Data Leaves
Your Network
Your Applications
Web apps, ERP, CRM, internal tools
SpreadAPI Runtime
Your server, Docker container
Enterprise Mode:
Disabled Cloud Save
For organizations that need absolute assurance, we offer Enterprise Mode where the "Save to Cloud" functionality is completely disabled.
Even if an employee tries to save data externally, it's architecturally impossible. The button simply doesn't exist.
Built for
Enterprise IT
Deployment Options
- Docker container
- Kubernetes / AKS / EKS / GKE
- Bare metal / VM
- Air-gapped environments
Performance
- 10-50ms typical response time
- Horizontal scaling supported
- In-memory workbook caching
- Handles 1000s of concurrent requests
Excel Compatibility
- 500+ Excel functions
- XLOOKUP, FILTER, SORT, UNIQUE
- LET, LAMBDA functions
- Full array formula support
Security
- No outbound connections required
- Local file-based storage
- Optional API authentication
- Request logging & audit trail
Requirements
- Node.js 18+ or Docker
- 256MB RAM minimum
- No external database
- No internet required
REST API
- Standard JSON request/response
- GET and POST supported
- OpenAPI documentation
- Health check endpoint
Built for
Regulated Industries
Financial Services
Loan calculations, risk scoring, portfolio valuations
Consulting Firms
Fee calculations, engagement pricing, resource models
Healthcare
Billing calculations, insurance processing, compliance
Insurance
Premium calculations, actuarial models, claims processing
Manufacturing
Bill of materials, cost rollups, margin calculations
Tax & Compliance
VAT calculations, transfer pricing, regulatory rules
Technical Whitepaper
Get the detailed technical documentation covering architecture, security model, deployment options, and compliance checklist.
Read Technical WhitepaperReady for Enterprise Excel APIs?
Let's discuss how SpreadAPI can help you scale your Excel-based business logic while meeting your compliance requirements.