The interactive suite
Live Diligence Working Papers.
Free tools that run in your browser. Run the math on your live deal, keep the record, export the file.
These are the working papers behind the Field Notes, rebuilt to run in your browser. Every number you enter carries an evidence state. Every output shows its lineage. Nothing here tells you whether to buy; it shows you what the record supports, so your call is defensible. Your numbers stay in your browser until you choose to export them.
The standard, in six chips
The full definitions live on the ParkProof Standard. Every tool below speaks this language.
Before Offer
Is this deal even worth your time?
60-Second Deal Screener
Six numbers, one posture.
8 inputs · about 60 seconds
POH/TOH Split Valuation
What the blended price hides.
7 inputs · about 5 minutes
In Diligence
Does the income exist, and does the ground match the paper?
Rent-Roll Truth Check
Deposits versus the OM.
3 sections · about 10 minutes
Expense Normalizer
Turn the seller's P&L into underwriting.
Variable inputs · about 15 minutes
Utility Capacity Risk Triage
The gates that can stop the deal.
13 inputs · about 10 minutes
Closing / Takeover
What must hold true before money moves?
EMD Clock and Gate Tracker
Your earnest money, on a clock.
3 inputs + gate register · about 5 minutes to set up
How the working papers connect
Run a tool. Keep the record.
Every tool exports your numbers, your evidence states, and your open items in one file. Free, no account, yours to keep.
Questions
Questions, answered.
Is this investment advice?
No. These are educational working papers. They calculate from your inputs and label what the record supports. They never tell you whether to buy. The boundary is the whole product: code calculates, people confirm, humans decide.
Do you keep my numbers?
No. Everything runs in your browser and saves to your browser's local storage. Nothing leaves your machine until you choose to download the JSON.
Do I need an account?
No. The tools are free to use with no account.
What is a ParkProof decision file?
The decision-file format: numbers, evidence states, open items, and assumptions in one record. Every tool exports JSON in one shared schema.
Why do my inputs say Broker-reported?
Because they came from the seller's paper until you verify them. Tap any chip to mark an input Verified with a source note, or leave it. The tool never upgrades an input on its own.
The Acquisition Workspace
Work your real acquisition inside CrosstownOS.
Running a live deal and want the full record? The Acquisition Workspace connects source evidence, field observations, and underwriting in one deal record. Single-deal $1,250, annual $2,500.
Book the fit call