Upload one offer
Add a California dealer quote, buyer’s order, broker offer, or lease worksheet in the app.
The second opinion for your California car deal.
Upload a California dealer quote, lease worksheet, buyer's order, or broker offer. DealReviewer.One checks confirmed deal math, identifies optional and unclear items, and prepares a ready-to-send counteroffer before you sign.
$19.99 in-app purchase · One California VIN · One report · One recheck within 7 days · No subscription
Private document processing
Payment handled by Apple
Built for California
Example result
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Deal Reviewer
The second opinion
for your California
car deal.
Terms of Service and Privacy Policy
How it works
How DealReviewer.One works
Confirm every number
OCR suggests visible values. You approve the VIN, amounts, categories, and treatment; the engine path is selected automatically from confirmed fields.
Review deterministic math
A dedicated Cash, Finance, or Lease engine calculates the confirmed inputs line by line.
Use the findings
Review evidence, optional or unclear items, and a counteroffer built only from confirmed findings.
ANALYZED REPORT
See what your One Report includes.
Illustrative example: values do not come from a real deal. Informational analysis only; not an approval or guarantee.
Cash purchase calculation
Confirmed-input calculation only. Not a market-price estimate.
Calculation bridge
Selling price$25,000.00
Less confirmed rebates− $1,000.00
Less trade-in allowance− $2,000.00
Confirmed optional product+ $1,495.00
Dealer-provided tax+ $1,800.00
Government fees+ $450.00
Dealer fees+ $85.00
Calculated out-the-door$25,830.00
Findings with evidence
Protection package · $1,495
Optional · High confidence
Evidence: confirmed sample line item
Tax not independently calculated
Medium confidence
The sample has a dealer-provided tax amount but no confirmed tax rate.
Finance purchase calculation
Confirmed-input calculation only. Not a market-price estimate.
Amount financed and payment
Calculated amount financed$25,030.00
APR7.50%
Term60 months
Dealer-stated payment$515.00
Calculated payment from confirmed inputs$501.55
Difference$13.45
Total of payments$30,093.00
Finance charge$5,063.00
Confirmed optional-product impact
Protection package principal$1,495.00
Monthly payment effect$29.96
Total payments for product$1,797.60
Finance charge on product$302.60
Payment without this confirmed removable item$471.59
The $13.45 difference is unexplained by the confirmed sample inputs. Ask for an itemized reconciliation.
Lease worksheet calculation
Confirmed-input calculation only. Not a market-price estimate.
Lease is available. Independent F&I expert review remains pending.
Lease calculation bridge
MSRP$40,000.00
Adjusted capitalized cost$38,650.00
Residual (60%)$24,000.00
Money factor0.00200
Monthly depreciation$406.94
Monthly rent charge$125.30
Monthly tax$53.22
Calculated monthly payment$585.46
Signing and total cost
Calculated due at signing$585.46
Total lease cost$21,471.56
Effective monthly cost$596.43
Annual mileage allowance12,000
The engine checks arithmetic using the confirmed residual and money factor. It does not claim those terms are competitive or lender base terms.
One Counteroffer
Built only from confirmed findings.
Please send a revised, itemized offer separating government fees, dealer fees, taxes, rebates, trade figures, and optional products.
This message is a negotiation aid, not legal advice.
One included recheck
Same VIN. One recheck. Seven days.
Review one revised offer for the same VIN within 7 days.
Negotiation support
Find charges you may be able to remove.
DealReviewer.One highlights possible markups, add-ons, unclear fees, and negotiable charges so you know exactly what to challenge.
Confirmed optional products
Items the document and user explicitly confirm as optional.
Potentially negotiable charges
Specific confirmed items that may be requested for removal.
Unexplained differences
Differences between dealer-stated figures and calculations from confirmed inputs.
Government-fee estimates
Clearly marked estimates with an official California DMV verification link.
Why DealReviewer.One
Deterministic review for California car deals.
DealReviewer.One is powered by purpose-built proprietary deterministic calculation and rules engines. These engines apply the same documented formulas and rules to the same user-confirmed inputs, producing consistent, repeatable, and explainable results. AI does not participate in the calculations or determine the report’s conclusions.
Deterministic engines
The same confirmed inputs produce the same Cash, Finance, or Lease result.
Evidence per finding
Each conclusion shows its confidence and the confirmed field or document line behind it.
No market-price claims
The report does not invent fair-market prices, lender base terms, residuals, rebates, or guaranteed savings.
VIN-bound access
One purchase applies to one valid VIN and includes one recheck of that VIN within seven days.
Simple pricing
One simple price.
One price. No tiers or upsells.
Valid for one California vehicle VIN. Includes one recheck for the same VIN within 7 days.
One Review
$19.99
One California car. One report. One recheck.
- Cash, Finance, or Lease engine report
- Line-by-line confirmed-input calculation
- Evidence-based findings
- Ready-to-use counteroffer
- One same-VIN recheck
Continue in the app
Review your deal in the app.
Install DealReviewer.One. Upload your documents, confirm the VIN, and complete the one-time purchase inside the app.
APP
Your review starts in the DealReviewer.One app.
The website does not collect your deal documents. Upload and payment both happen in the app.
One Review
$19.99
- Install DealReviewer.One.
- Upload your California offer and confirm the VIN.
- Approve the one-time in-app purchase.
One California car. One report. One recheck.
How the app handles your document and payment
Documents are processed in private storage encrypted at rest.
Access is limited to services needed for OCR, report generation, security, and support.
Raw uploads are deleted after processing or within 30 days maximum.
Documents are not sent to dealers unless you choose to share them.
Apple or Google handles payment. We do not collect your card number.
You can confirm unclear values or upload a clearer copy.
Estimated report time Readable documents are typically processed in a few minutes after confirmation and purchase. Unclear documents may take longer.
Purchases and refunds follow Apple or Google rules. Contact support if a report cannot be completed. Read the Privacy Policy
Get the app
Download DealReviewer.One
Install the app to begin your review. Upload your California offer, confirm the extracted numbers, and receive a line-by-line calculation with findings and a counteroffer.
California MVP
California only for now.
We are starting with California to make the analysis more precise. Other states may be added later.
FAQ
Questions before you upload
Does AI calculate the final numbers?
No. OCR can suggest visible fields, but the user confirms them. Dedicated deterministic Cash, Finance, and Lease engines perform the calculations.
Is this a market-price comparison?
No. DealReviewer.One recalculates confirmed deal terms. It does not claim a fair-market price, best price, lender base rate, or every available rebate.
What if a required number is missing?
The engine blocks a complete result and asks for the missing value. Lease requires a residual and money factor before a complete lease calculation.
Is Lease available?
Yes. DealReviewer.One reproduces confirmed Lease worksheet arithmetic under its DVS 1.0 first-party validation requirements. DVS is not an independent or government certification, and the app does not claim that a money factor, residual, tax treatment, or lender program is competitive.
Can I check a revised offer?
Yes. One purchase includes exactly one recheck for the same VIN within seven days of the first report.
Before you sign, get
Recalculate the confirmed numbers, review optional or unclear items, and prepare a counteroffer.