Your Excel Model Is Already Built. Make It an API.
SpreadsheetWeb turns your existing Excel calculations into a live REST API — no coding, no rebuilding, no developers needed. Start for free and publish your first API in minutes.
Your Excel Logic, Available Anywhere
If your business relies on complex calculation models built in Excel — insurance pricing tools, financial calculators, engineering models, ROI estimators — integrating that logic into an external application has traditionally meant rebuilding everything from scratch in code.
SpreadsheetWeb eliminates that entirely. You upload your Excel file, configure which cells are inputs and which are outputs, and SpreadsheetWeb exposes the model as a RESTful JSON API. Any application that can make an HTTP request can send values in, and get calculated results back — instantly, reliably, and without ever touching the underlying formulas.
Your calculation engine stays in Excel. Your formulas stay protected. And every platform, language, or framework your developers work with can integrate it immediately. See the full platform feature set or explore enterprise deployment options including private cloud and on-premise.
From Excel File to Live API in Minutes
No development team needed. No rebuilding logic. Just your existing Excel model, published as a web service.
Upload Your Excel File
Log into SpreadsheetWeb Hub and create a new application. Upload your Excel file and select API as the application type.
Configure Inputs and Outputs
Use the built-in API Toolkit to define which named ranges are inputs and which are outputs. The JSON request structure builds automatically.
Publish and Test
Publish the API with your chosen access type. Test it instantly in the Toolkit or export a ready-to-use Postman collection.
Integrate and Scale
Connect from any application using standard HTTP requests. Store results in a database, generate audit exports, and manage everything from the Hub.
Everything You Need to Build and Manage a Production API
From testing to data capture to compliance auditing — SpreadsheetWeb covers the full API lifecycle without custom development.
Built-in API Toolkit
A Postman-style testing environment built directly into SpreadsheetWeb. Add inputs and outputs, fire requests, and verify results against your Excel model — before writing a single line of code. Read the docs →
Postman Collection Export
Export your configured API request as a ready-to-import Postman collection. Skip manual request setup and move straight to live testing in the tool your developers already use.
Automatic Data Capture
Configure the API to store every request and its results in a central database automatically. Track inputs, outputs, and timestamps across every API call with no extra development work.
Central Data Management
View, filter, and manage all stored API records directly in SpreadsheetWeb Hub. Every calculation is logged, searchable, and accessible — no separate database tooling required.
Excel Audit Export
Generate a downloadable copy of the full Excel file populated with the exact inputs and outputs from any API call. Built-in audit trail for compliance-sensitive applications.
Flexible Access Control
Choose from multiple access types — anonymous for open tools, restricted for authenticated integrations. OAuth-based authentication with client credentials for secure enterprise deployments. API reference →
Who Uses the SpreadsheetWeb API
Any business with Excel-based calculation logic that needs to be integrated into an external system, customer-facing application, or automated workflow.
Insurance and Financial Platforms
Embed complex pricing and quoting logic directly into customer-facing applications and agent portals without exposing or rebuilding the underlying model.
- Insurance premium calculation engines
- Loan and mortgage quoting tools
- Investment return and retirement planners
- Tax liability and financial planning models
Engineering Calculation Services
Expose complex engineering models as a service for client applications, configurators, or internal tools — while keeping proprietary calculation logic fully protected.
- Structural and civil engineering calculators
- HVAC sizing and energy modeling tools
- Material cost and specification engines
- Compliance and safety check models
Business Logic Integration
Connect Excel-based business logic to CRMs, ERPs, customer portals, and internal tools without custom development or data migration.
- Sales pricing and quoting engines
- ROI and cost-benefit calculators
- Commission and incentive models
- Operational cost and forecasting tools
Everything You Saw in the Tutorial Is Available Right Now
You have seen how it works. Here is what you can do the moment you sign up for free.
Upload Your Excel File
Bring any Excel model you have. Insurance calculators, pricing tools, engineering models, financial planners — any file with inputs and outputs works.
Publish It as an API
Select API as the application type, configure your inputs and outputs using named ranges, and hit Publish. Your API is live in minutes.
Test with the Built-in Toolkit
Use the API Toolkit to fire test requests, verify results against your spreadsheet, and export a Postman collection for your development team.
Capture Every Calculation
Enable database storage so every API request and result is logged automatically. No extra development work — it is built in.
Generate Audit Files
For compliance-sensitive applications, configure Excel export so every API call produces a downloadable audit file with the full model state.
Integrate Into Any Application
Connect from any platform, language, or framework using standard HTTP requests. Your calculation logic is now available everywhere your application needs it.
Learn More About SpreadsheetWeb
The API is one of several ways SpreadsheetWeb puts your Excel models to work. Explore what else is possible.
Platform Features
See the full set of SpreadsheetWeb capabilities — web apps, workflows, databases, reporting, and more.
View features →Enterprise Deployment
Private cloud and on-premise options for organizations with advanced security, compliance, and governance requirements.
Learn more →Live App Gallery
Browse real SpreadsheetWeb applications built from Excel — calculators, dashboards, quoting tools, and more.
Explore gallery →Excel Calculations via RESTful API
A technical deep-dive into connecting Excel calculation logic to external applications using SpreadsheetWeb's RESTful API.
Watch the video →API Toolkit Documentation
Full documentation for the API Toolkit — inputs, outputs, batch calculations, authentication, and advanced configuration.
Read the docs →Web Service Designer Guide
Step-by-step guide to the Web Service Designer — databases, events, Excel export, named ranges, and publishing.
Read the guide →Your Excel Model Is Already Built. Let's Make It an API.
Try SpreadsheetWeb free and publish your first API in minutes. No coding required. No credit card needed.