Your spreadsheet. On your website.
A calculator for your site.
Built from your spreadsheet.
Turn the spreadsheet you already trust into a polished calculator or estimator that fits your existing website. Keep your pages and your brand. Give visitors a useful way to get an answer, and a way to ask you for more.
Upload a workbook, get a preview. Publish when it's right.
Wind load
100.3 kN
Required pull
10.2 tf
Your inputs and results, sent as one package.
From this … to this
Keep the expertise. Put it on your page.
Your spreadsheet already does the thinking. We rebuild it as a calculator with clear inputs and useful results, test it against your own numbers, and give it a home on a page your customers already visit.
| A | B | C | |
|---|---|---|---|
| 2 | Loan amount | $320,000 | |
| 3 | Rate | 6.25% | |
| 4 | Term | 30 years | |
| 5 | Monthly payment | $1,970.49 | =PMT(B3/12,B4*12,-B2) |
| 6 | Total interest | $389,376 | =B5*B4*12-B2 |
The knowledge is there. The interface is a grid.
Example being built
This slot shows the live calculator once the showcase is converted. Nothing here is simulated.
Rebuilt, tested against your own numbers, designed. Every build comes with a check that the results match the workbook's.
What you get
Four things a spreadsheet can't do on its own.
Share it
Send clients and colleagues a link instead of a file. Everyone sees the same version, nobody breaks a formula.
Make it beautiful
Clear inputs, a result they can read at a glance, your logo and colors. A grid becomes a tool.
Works on a phone
Sized for a thumb. A salesperson can run it standing next to the customer.
Put it on your site
One line of code embeds it in any page. Your navigation, your content, your brand stay as they are.
What it's for
The spreadsheet everyone comes back to? Start there.
For professional services, finance, insurance, construction, operations and technical teams. Give the calculation people rely on a place on your website, and a reason to contact you.
Estimates and quotes
Request a quote
The visitor configures, sees the price, and sends you the whole package: their inputs, the results, their contact details.
Calculators
Calculators
Fees, payments, savings, loads, doses. The sheet your team already relies on, available to the people who ask for it.
Estimators
Estimators
Rough numbers early: a project cost, a system size, a timeline. Enough to start the conversation.
Product selectors
Product selectors
"Which account is right for me?" "Which model fits this duty?" The selector asks, your rules answer.
Lead generation
Lead generation
Add a "Send me more info" or "Book a call" button. Every answer becomes a lead with context attached.
Start on your website. Go further when you need to.
One model. Three ways to use it.
Embed it in your site
Add a calculator, estimator or selection tool inside an existing page. Your site keeps its navigation, content and branding; the component brings the calculation.
The simplest place to start
Share it as an app
Give customers or colleagues a standalone application with a link. Use focused pages when the workflow needs more room.
A dedicated experience
Let an AI use it
A connected AI assistant can discover the inputs, run the calculation and get structured results back. The same model, available to agents.
Model Context Protocol access
From spreadsheet to website component
The logic stays yours. The busywork becomes ours.
01
Start with your workbook
Upload it with a few notes about who uses it and what for. We identify the inputs, formulas and outputs and flag anything the sheet depends on.
02
We rebuild the logic
The calculation becomes a model with its own rules and lookups. The workflow is arranged into focused, usable pages.
03
The results are checked
Every output is compared with your workbook's own numbers. You get the receipt with the preview.
04
Make it yours and publish
Pick the purpose, the access, the buttons. Add your logo. Publish as an embed, an app, or both.
Your spreadsheet is the starting point
Different sources. One honest answer.
Excel first. The others arrive through an Excel export, with the results checked against the original.
Excel workbooks (.xlsx)
Formulas, lookups, cross-sheet references and repeating rows. Every build is checked against the workbook's own values.
Google Sheets
Export to Excel, then upload. We check the results against your original sheet. No live sync.
Apple Numbers
Export to Excel, then upload. Tables and formulas are checked against the original.
OpenDocument (.ods)
Export to Excel for now. Direct import is in testing.
CSV and TSV
Good for lookup tables and price lists. They carry no formulas, so they join a workbook rather than replace one.
Macros, add-ins, connections
VBA, Apps Script and external connections are named in your build report. Their logic needs its own scope.
Importing a snapshot is different from keeping an app synchronized with its source. A changed workbook is a rebuild, and rebuilds are part of the plan.
Simple plans for useful applications
Preview first. Publish when it earns its place.
Preview
Free
See your spreadsheet as a calculator before you decide anything.
- Upload a workbook and get a preview
- The build report, with the checks
- Rebuild with new instructions
- No publishing
Publish
Most chosen$29/ month
Your first calculator or estimator, live on your site.
- 1 live app, embed and standalone
- Drafts and rebuilds included
- Request-a-quote and lead buttons
- Leads sent to your email
- Your logo and colors
- Small ReactiveSheets footer
Studio
$79/ month
A small collection of tools, under your brand.
- 5 live apps
- Everything in Publish
- No ReactiveSheets footer
- Lead list and export
- Protected access
- Page assistant, 500 answers a month
Partner. Building tools for clients? Several apps, white-label, one account. Ask us.
Hard workbook? Macros, thousands of formulas, several linked sheets. We scope it and quote a build, from $299.
Prices in US dollars. Change or cancel any time; a published app stays up until the end of the period you paid for.
A few good questions
Before you unfold your spreadsheet.
Your spreadsheet knows the answer.
Let your website share it.
Upload a workbook, get a preview. Publish when it's right.