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.
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.
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
The engine is compiled to WebAssembly and runs in your browser. Open the network tab — there is nothing to see. Works on a plane.
How it works
- 1
Open your .xlsx
Drag in an Excel model — or load the bundled sample. It's parsed locally; nothing is uploaded.
- 2
Audit & trace
Read the integrity findings, then follow the dependency graph behind any cell.
- 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.
Works offline
Pull the Wi-Fi and it still runs. 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.
Pricing
The auditor is free, forever. Monte Carlo and the signed, reproducible audit report come with Pro & Firm.
Free
$0/forever
No account, no card.
- Import any
.xlsx - Integrity audit
- Dependency map
- What-if recalc
- 100% local
Pro
~$99/mo
billed monthly · or save with yearly
- Everything in Free
- Monte Carlo simulation
- Signed reproducible report
- 3 devices
Firm
~$499/mo
billed monthly · 5 seats
- Everything in Pro
- Shared assumption libraries
- Exportable audit trails
- 5 seats included
Pricing is indicative; Pro & Firm open after launch. Billed by Lemon Squeezy (Merchant of Record).
Be first on Pro & Firm
We're building Monte Carlo and the signed audit report with a handful of early users. Leave your email and we'll reach out — and ask what you'd actually pay for.