Headless Spreadsheets for AI & Automation

Turn Excel Into Live APIs.
Let AI Talk to Spreadsheets

Convert spreadsheets into secure, real-time web services. Give AI assistants, automation tools, and developers direct access — without hallucinations or broken logic.

 
From Excel to API in Minutes — Power Automations, Apps & AI Agents

Your Excel Logic, Available Everywhere

Upload your spreadsheet. Define inputs and outputs. Get a REST API that runs your exact formulas in milliseconds.

1

Upload Excel

Your existing spreadsheet with all its formulas. Nothing to change.

2

Define Parameters

Mark cells as inputs and outputs. Takes 2 minutes. No code needed.

3

Call Your API

GET or POST request — returns clean JSON with calculated results.

50ms
Response time
500+
Excel functions
100%
Accurate
Zero
Lines of code

Here's How We Help AI Excel at Spreadsheet Math

Transform your spreadsheets into real-time APIs that AI can call — no guessing, no hallucinations, just accurate results powered by your Excel logic. Whether it's simple calculations or complex chains of nested formulas, your Excel logic is executed exactly as you built it. The result: clean, reliable JSON that AI assistants, developers, and automation tools can work with — instantly and securely.

Learn more about AI Integration
In Action

AI Sales Agents Creating Complex Excel Quotes

Your AI sales assistant can now generate accurate quotes using your actual Excel pricing models. No more approximations or hallucinations — just precise calculations from your trusted spreadsheets, accessible through a simple API.

100% Accurate Calculations

Your Business Logic Protected

Works with Any AI Assistant

I need a quote for 500 units with our enterprise discount, shipped to 3 locations in California
AI
I've calculated your quote using our Excel pricing model:
Base Price (500 × $47.99):$23,995.00
Enterprise Discount (15%):-$3,599.25
Volume Discount (500+):-$1,199.75
CA Shipping (3 locations):$485.00
CA Sales Tax (7.25%):$1,431.88
Total Quote:$21,112.88
Calculated by Excel in 47ms • 100% accurateDownload PDF
AI Excel Workflow Example

Automation Tools Running Your Excel Logic

Tools like Zapier, Make, and n8n can now trigger calculations in your Excel models with live inputs and return real results — instantly. No logic reimplementation. No formula rewrites. Just exact Excel behavior delivered as a secure, real-time API.

Plug & play with any workflow tool

Returns only clean JSON, never shows formulas

Handles any Excel complexity — IFs, XLOOKUPs, ARRAY functions, VAT logic, pricing

"Just convert this Excel to code", they said.

It's one of the most common dev requests — turning business-critical spreadsheets into code. But nested IFs, lookup chains, and constantly changing logic quickly turn it into a maintenance nightmare. With SpreadAPI, developers don't need to rebuild spreadsheet logic — they can run it directly, through a secure and versioned API.

100% Formula Accuracy - VLOOKUP, SUMIFS, financial functions - they all work exactly as designed. Because it's real Excel, not a JavaScript approximation.
Business Users Keep Control - When formulas change, they update the Excel. Your API instantly reflects the changes. No code deployment needed.
Read: Why reimplementing Excel always fails →
Why Reverse Engineering Excel Fails - Don't re-code Excel, Just run Excel

Works With Every AI Platform and Automation Tool

SpreadAPI works with Claude, ChatGPT, and any AI assistant through our MCP server. Connect via REST API, webhooks, or integrate with Zapier, Make, and n8n. Your Excel calculations become accessible everywhere.

Start Building
Use Cases

What Game-Changing Technology Enables

Financial Advisors

Run complex what-if scenarios using actual Excel models. AI analyzes options without errors.

Business Analysts

Automate report generation from spreadsheet data. AI extracts insights from your calculations.

AI Assistants

Optimize spreadsheet formulas automatically. AI suggests improvements while preserving logic.

Sales Teams

Generate accurate quotes instantly. AI uses your pricing models to create perfect proposals.

Operations

Complex resource planning with Excel. AI optimizes allocation using your business rules.

Developers

Skip rebuilding Excel logic in code. Use spreadsheets as calculation engines via API.

Need Full Control
Over Your Data?

Working in an industry where compliance and data security are non-negotiable? With SpreadAPI Runtime, you can deploy your Excel-based APIs entirely on your own infrastructure. No data ever leaves your network.

Developer FAQ

Technical Questions Answered

Deep dive into the technical details. Built by developers, for developers.

How reliable are the calculations compared to native Excel?

SpreadAPI uses an advanced Excel-compatible calculation engine that supports all Excel features including array functions, dynamic arrays, and complex formulas. Every calculation is fully compatible with Excel, ensuring your formulas work exactly as expected. Our engine handles even the most sophisticated Excel features with 100% accuracy.

What happens to my proprietary formulas and business logic?

Your Excel formulas and business logic stay completely private. They're never exposed through the API or shared with AI providers. The API only returns calculation results, not the underlying formulas. Your intellectual property remains protected.

Is my data shared with AI providers like OpenAI or Anthropic?

No. Your Excel files stay on SpreadAPI's secure servers (SOC 2 Type 2, ISO 27001 certified). AI assistants only access cells you explicitly permit—they receive calculation results, never your formulas. We don't store query inputs or results beyond a 15-minute cache. Your data is never used for AI training.

What about on-premises deployment for regulated industries?

SpreadAPI offers a fully on-premises Runtime for organizations with strict compliance requirements (HIPAA, SOC 2, ISO 27001, GDPR, PCI DSS). Deploy via Docker or Kubernetes within your infrastructure—no external connections required, air-gap compatible. Your data never leaves your network, and there's zero vendor access. Contact us at team@airrange.io for enterprise options.

Can SpreadAPI handle real-time data and streaming calculations?

Yes. SpreadAPI supports webhook triggers and real-time updates. When your Excel data changes, dependent calculations update automatically. You can also stream calculation results for live dashboards and monitoring systems.

What about Excel features like macros, pivot tables, and charts?

SpreadAPI supports most Excel features including pivot tables, data tables, and complex formulas. Charts and visualizations can be generated as data endpoints for your frontend to render. Note: VBA macros and linked workbooks are not currently supported.

How do you prevent calculation errors and handle edge cases?

SpreadAPI includes comprehensive error handling that mirrors Excel's behavior. #DIV/0!, #VALUE!, #REF! and other Excel errors are properly returned through the API. We also provide detailed error messages to help debug formula issues.

What's the latency for complex calculations?

Simple calculations return in 50-100ms. Complex models with thousands of formulas typically complete in 200-500ms. We use intelligent caching and pre-warming to minimize cold start times. For comparison, uploading a file to an LLM takes 5-10 seconds.

How does billing work for high-volume applications?

We offer transparent usage-based pricing with no hidden fees. Free tier includes 100 API calls/month. Paid plans start at $29/month for 10,000 calls. Enterprise customers get volume discounts and dedicated infrastructure.

Contact

Get Started in Minutes

Questions about SpreadAPI? We're here to help at team@airrange.io.