See exactly what changed in any Excel workbook

Formulas, values, sheets, VBA, and structure — compared at the level finance, operations, and engineering teams actually need. Free in your browser. Add team review and an audit trail when you're ready.

Compare two files Review changes as a team →
Formulas
compared as logic (AST), not text
Structure
inserted & deleted rows detected
VBA + macros
module-level code comparison

Old / Base file

.xlsx .xlsm .xls .xlsb

or click to browse

New / Modified file

.xlsx .xlsm .xls .xlsb

or click to browse

Files never leave your computer. All processing happens locally via WebAssembly.
Runs 100% in your browser. Your files never leave your computer.
Your files stay private

No uploads. No servers. No data collection.

SheetDelta runs entirely in your browser using WebAssembly. Your Excel files never leave your computer — not even temporarily. There is no server to send them to.

SharePoint tells you the file changed. SheetDelta tells you what changed.

Version history can roll a workbook back to last Tuesday. It can't tell you which formula moved, who moved it, or which cells were affected. That's the gap SheetDelta fills — for one-off comparisons and for teams that review critical models on a schedule.

What changed

Every changed formula, value, sheet, named range, and macro — down to the individual cell. Inserted rows don’t turn into noise.

Who changed it

Authorship pulled from SharePoint or OneDrive and attached to each change, so “who touched this formula?” has an answer.

Whether it’s safe

Comment, review, and sign off before a change reaches the people who trust the number. Block the risky ones.

How it works

Step 1

Drop two files

Drag your old and new Excel files onto the page.

Step 2

Instant comparison

The engine compares every cell, formula, and sheet.

Step 3

See what changed

Color-coded results show additions, removals, and modifications.

What SheetDelta catches that others miss

Cell-level precision

Every value, formula, and format change detected.

Noise immunity

Ignores Excel save noise — shared strings, style reordering, calcChain shuffles.

Formula intelligence

Compares formula logic at the AST level, not just text.

Structural detection

Detects inserted/deleted rows, not just changed cells.

VBA comparison

Paid

Module-level comparison of macro code across workbooks.

Pull request diffs

Paid

A readable cell-level diff on every Excel pull request, via the CLI and GitHub Action.

New

Your AI agent can read Excel now, too

Agents are already editing spreadsheets. SheetDelta ships an MCP server and a token-lean CLI, so Claude, Cursor, and your own agents can diff and read workbooks — and you can see exactly what an agent changed, down to the formula. No Excel, nothing uploaded.

  • One-click MCP setup for Claude Desktop & Cursor
  • Compact agent output, about 10× leaner than full JSON
  • Let an agent verify its own edits — or gate changes in CI
Explore SheetDelta for AI agents →
sheetdelta diff old.xlsx new.xlsx -f agent
{"sheet":"Assumptions","ref":"B12","op":"modified","kind":"formula","old":"=Growth*0.08","new":"=Growth*0.09"}
{"sheet":"Headcount","ref":"A14","op":"added","kind":"text","new":"Q2 backfill"}
{"sheet":"modPricing.bas","op":"vba_modified"}

Built for teams that can't afford mystery edits

Finance & FP&A

Catch a broken forecast before the board sees it.

Learn more →

Actuarial & insurance

A provable audit trail for regulated models.

Learn more →

Developers & data

Make git diff readable for .xlsx in pull requests.

Learn more →

Operations & RevOps

Version-control pricing, commission, and inventory sheets.

Learn more →

AI & agent workflows

Let an agent edit a workbook — then see exactly what it changed.

Learn more →

One engine, several surfaces

The same Rust diff engine, wherever you work — and however much you trust the cloud.

Free web tool →

Compare two workbooks in your browser. Nothing to install, nothing uploaded.
Desktop app →

The full engine, 100% offline. Perpetual license for privacy-bound work.
Hosted platform →

Team review, version history, and audit trail — watching your SharePoint or OneDrive.
Excel add-in →

Diff inside Excel, free. Sign in to bring your team’s reviews into the workbook.
CLI & MCP for AI agents →

An MCP server and token-lean CLI so AI agents can diff and read workbooks — and you can see what they changed.

Simple, honest pricing

The tool is free. You pay to own the full engine, or to give a team shared review, history, and an audit trail.

Free

$0

The web tool and the Excel add-in. Compare workbooks locally, forever.

  • Compare two files in the browser
  • Free Excel add-in (diff in-context)
  • Runs 100% on your device
  • No account, no upload
Open the web tool

Desktop

$149 one-time

The full engine on your machine — for workbooks that must never touch a cloud.

  • AST-level formula diff
  • VBA macro diff
  • .xlsb / .xls / charts / pivots
  • Structural row & column detection
  • CLI + MCP server for AI agents
  • Audit-trail export
  • Runs fully offline, no account

+ ~$49/yr maintenance for updates. The app keeps working after maintenance lapses.

Buy now
Most popular

Team

$29 /user/mo

Hosted review for teams. Watches your SharePoint or OneDrive — nothing to change.

  • Version history + cell-level diffs
  • SharePoint / OneDrive cloud-watch
  • Cell-anchored review comments
  • Sign-off & approvals
  • Audit-trail export
  • Web dashboard + Excel add-in

Paying solo? A single seat works. No separate individual subscription needed.

Join the closed beta

Team Plus & Business

From $49 /user/mo

Approval gates, content checks, write-back, SSO, and retention controls.

  • Everything in Team
  • Block-until-approved gate
  • Content checks (control totals, locked ranges)
  • Write-back of approval status
  • Git / PR diff comments
  • SSO, SCIM & retention controls (Business)
Compare tiers

Developers — CLI & GitHub Action

Diff workbooks in CI and comment the changes on every pull request. One flat developer or team key — no per-seat metering.

See the developer tools →

Self-hosted & air-gapped

Run the entire platform inside your own network for workbooks that can never leave it. Annual contract, sold direct, with deployment support.

Talk to us →

On Microsoft 365? You can buy hosted seats through the Microsoft Marketplace and pay on your existing Microsoft invoice. Need SSO, retention controls, or a site license? Contact us →

Frequently asked questions

Is the comparison tool really free?
Yes. The web tool and the Excel add-in are free and run entirely on your device. You only pay when you want a team to share reviews, version history, and an audit trail on the hosted platform.
Do my files get uploaded?
No. The web tool compares both workbooks locally in your browser using WebAssembly — nothing is sent to a server. The desktop app is fully offline. Only the hosted platform processes files server-side, and only for files you explicitly connect.
We already have SharePoint version history. Why do we need this?
SharePoint and OneDrive version a file — they roll the whole workbook back. They don’t show which formula changed, who changed it, or which cells were affected. SheetDelta is the comparison-and-review layer on top of the versions you already keep. See Excel version history vs SheetDelta.
What file formats are supported?
The free tool handles .xlsx and .xlsm. The desktop app and platform add .xlsb, .xls, and template formats, plus deeper formula, VBA, chart, and pivot analysis. See supported formats.
Can AI agents use SheetDelta?
Yes. SheetDelta ships an MCP server and a token-lean CLI, so AI assistants like Claude and Cursor — and your own agents and CI — can diff and read Excel workbooks directly, with nothing uploaded. It’s a clean way to see exactly what an agent changed before you trust it. See SheetDelta for AI agents.
Does SheetDelta merge workbooks or resolve conflicts?
No — and we’re deliberate about that. SheetDelta shows you exactly what changed and lets your team review and approve it. It does not auto-merge two workbooks, because silent merges are how spreadsheets break.

Popular Excel comparison tools

Free, in your browser — pick the one that matches what you're searching for.

Compare Excel files →

Drop two workbooks and see every changed cell, formula, and sheet — free, in your browser.
Compare Excel sheets →

Match sheets and rows even after they move, so inserts don’t drown the real changes.
Excel diff →

A real diff for Excel — formula logic and structure, not a line-by-line text compare.
Spreadsheet compare →

A modern, cross-platform alternative to Microsoft Spreadsheet Compare.
Compare .xlsx files →

Diff two .xlsx workbooks without opening Excel or installing anything.
Compare .xlsm files →

See macro and formula changes in macro-enabled workbooks.

Ready to review changes as a team?

See every change, know who made it, and sign off before it ships. Watches your SharePoint or OneDrive — nothing to change.

Join the closed beta See pricing