100% local · nothing uploaded · no account

The pre-close model you can't paste into a cloud tool. Audit it here.

An LBO, a cap table, a real-estate pro forma under NDA: the models that matter most are the ones you can't upload to a SaaS spreadsheet or a chatbot. FundQuill imports your .xlsx and finds the broken formulas and circular references, traces how every number is built, and recomputes it under your assumptions, entirely in your browser. The file, the formulas, and the numbers never leave your device.

Open the workstation See pricing

Built for boutique M&A, VC, real-estate and fractional-CFO teams.

What it does

Integrity audit

Sweep the whole workbook for circular references and error cells (#REF!, #DIV/0!, #NAME?) before they reach a committee deck, and fix many in one click. All free.

Dependency map

Trace any number to its precedents and dependents, and see exactly where a circular chain closes. Know what breaks before you touch a cell.

What-if recalc

Flag the assumptions, flex them, and watch the outputs move on the spot: a real incremental recalc engine, not a re-open.

Never leaves your laptop

Your model is opened and audited entirely on your own machine. Open the network tab: there is nothing to see.

Three steps, zero uploads

  1. 1

    Open your .xlsx

    Drag in an Excel model, or load the bundled sample. It's parsed locally; nothing is uploaded.

  2. 2

    Audit & trace

    Read the integrity findings, then follow the dependency graph behind any cell.

  3. 3

    Stress-test

    Mark your assumptions, change them, and recompute outputs instantly.

Evidence, not certification

A cloud tool asks you to trust its servers with your most sensitive file. FundQuill asks you to trust nothing: the work happens on your machine, and you can prove it.

Zero egress

No upload, no telemetry, no third-party scripts. Open DevTools → Network and confirm it yourself.

Keeps working offline

Once the page is open, pull the Wi-Fi and it keeps going. If it can't phone home, it can't leak your model.

NDA-safe by construction

Nothing to put in a vendor security review. The model never crosses a network boundary, so there's nothing to breach.

Simple pricing

The auditor is free, forever. Scenario & stress testing, sensitivity analysis, Monte Carlo and the signed reproducible report come with Pro & Firm.

Free

For everyday model checks.

$0/forever

No account, no card.

  • Import any .xlsx
  • Integrity audit
  • One-click error fixes
  • Dependency map
  • What-if recalc
  • 100% local
Open it now

Pro

Most popular

Everything, on your devices.

$99/mo

billed monthly · or save with yearly

  • Everything in Free
  • Scenarios & stress testing
  • Sensitivity & tornado tables
  • Monte Carlo simulation
  • Signed reproducible report
  • Model templates · 3 devices
Subscribe

Firm

For firms & deal teams.

$99/seat/mo

billed monthly · from 3 seats

  • Everything in Pro, per seat
  • Shared assumption libraries
  • Exportable audit trails
  • Team admin & invite codes
Set up a team

Pro and Firm include a 14-day refund window. See our Refund Policy.

Your models, audited privately.

Open the workstation and audit your model. Nothing leaves your browser.

Open the workstation