How does Warnvo scan bills?

Take a photo of any bill — hotel, medical, restaurant, contractor — and Warnvo's AI analyzes it in seconds. It identifies overcharges, junk fees, and illegal charges, then generates a ready-to-send dispute letter.

What languages does Warnvo support?

Warnvo works in 95 languages. You can scan bills in any language — Japanese, Arabic, Spanish, Portuguese, French, German, Thai, and 87 more — and receive results in your preferred language.

Can Warnvo detect scam texts and emails?

Yes. Warnvo's Scam Detector analyzes text messages, emails, and phishing links before you click. It catches fake FedEx texts, fake bank alerts, IRS scams, and smishing attempts.

Is Warnvo different from ChatGPT?

Yes. Warnvo is trained specifically on consumer protection law — not general knowledge. It knows the specific laws, regulations, and consumer rights that apply to your situation, and generates legally-grounded dispute letters you can actually send.

How much does Warnvo cost?

Warnvo offers a free tier with 3 scans per day. Pro is $19.99/month or $149.99/year for unlimited scans. Family Shield covers up to 6 people for $14.99/month.

Can Warnvo help with medical bills?

Yes. Warnvo's Medical Bill Analyzer identifies billing errors, upcoding, duplicate charges, and services never rendered. It generates a dispute letter referencing the specific billing codes and regulations that apply.

Scan Any Bill. Catch Junk Fees. Generate Dispute Letters Instantly.

Warnvo is the world's first AI consumer protection app. Snap a photo of any bill — hotel, medical, restaurant, contractor, auto repair — and Warnvo's AI analyzes every line item in seconds. It flags overcharges, junk fees, and illegal charges, then generates a ready-to-send dispute letter. Works in 95 languages across any country.

34 Specialized AI Tools for Consumer Protection

Hotel Bill Analyzer, Medical Bill Checker, Restaurant Receipt Scanner, Auto Repair Bill Analyzer, Contractor Bill Checker, Scam Detector, SMS Scam Detector, Phishing Email Detector, QR Code Scanner, Lease Analyzer, Bank Fee Analyzer, Insurance Claim Analyzer, Medicare Bill Checker, Paycheck Stub Analyzer, Credit Report Analyzer, Student Loan Analyzer, Gig Worker Fee Analyzer, HOA Fee Analyzer, Utility Bill Checker, Security Deposit Dispute, Prescription Price Checker, Timeshare Exit Advisor, Crypto Scam Detector, Dark Pattern Detector, Fake Job Offer Detector, Subscription Tracker, Negotiation Script Generator, Price Drop Tracker, Return Policy Analyzer, Warranty Tracker, Tip Fraud Detector, Delivery Scam Detector, Before You Sign Contract Analyzer, Junk Fee Calculator.

How Warnvo Works

Step 1: Take a photo of your bill or paste the text. Step 2: Warnvo's AI analyzes every line item against fair market rates and consumer protection law. Step 3: Get a full report flagging suspicious charges. Step 4: Download a ready-to-send dispute letter referencing the exact laws that protect you.

Works in Any Language, Any Country

Warnvo reads bills in Japanese, Spanish, French, German, Portuguese, Italian, Arabic, Thai, Chinese, Korean, and 85 more languages. Whether you're disputing a hotel fee in Tokyo, a restaurant charge in Rome, or a medical bill in the United States, Warnvo applies local market benchmarks and the consumer protection laws that apply to your situation.

Dispute Hotel Bills, Medical Bills, and More

Hotel junk fees — resort fees, destination fees, amenity fees — are among the most common consumer complaints. Warnvo's Hotel Bill Analyzer flags every suspicious charge and generates a dispute letter you can hand to the front desk or send to the hotel's billing department. Medical bill errors affect 1 in 5 patients. Warnvo's Medical Bill Checker identifies upcoding, duplicate charges, and services never rendered.

For travelers

You didn't know the charge was wrong. You couldn't read the bill.

Forward any hotel folio, airline receipt, or rental car charge to Warnvo. ShieldEngine™ reads in English, Portuguese, German, French, and Spanish — and has your dispute ready before you leave the country.

Start free scan →See a sample report

warnvo.com / scan / hotel

2 flags

Hotel Esperanza · LisbonACCT #2871

Room rate · 3 nights

€540.00

!Resort fee

€45.00

!Breakfast · credited twice

€36.00

City tourism tax

€18.00

Parking · 3 nights

€75.00

Total disputed−€81.00

The fee was buried in the folio. You were right to question it.

Hotels and airlines overcharge travelers in predictable, documented ways. Resort fees added after booking. Currency conversion markups never consented to. Minibar charges for items never touched. When the document is in another language, challenging it feels impossible. It isn't.

"The bill is in Portuguese and I can't tell what half these line items even mean."

Language barriers are exactly how overcharges go unchallenged. ShieldEngine™ reads hotel folios, rental contracts, and airline documents in five languages — and flags anything that doesn't match your booking.

"There was a resort fee at checkout that was never mentioned when I booked."

Undisclosed mandatory fees may violate FTC deceptive pricing rules. ShieldEngine™ flags any charge not clearly disclosed at booking and drafts the dispute letter citing the exact regulation.

"I noticed the overcharge on my last night. Do I have time to dispute this before I fly home?"

Yes. ShieldEngine™ delivers a response in about ninety seconds — while you're still in the lobby. The dispute letter goes out in the language the vendor wrote the original bill in.

Six document types. One engine reads them all.

Six document types · Five languages

Hotel folios & resort fees

"I just got my folio and there are three charges I didn't authorize."

What the travel agent catches: Undisclosed resort fees, duplicate service charges, city tax miscalculations, currency conversion markups above bank rate.

Airline refunds & cancellations

"The airline cancelled my flight and I'm not sure what I'm owed."

What the travel agent catches: Refund amount shortfalls under DOT Part 259, voucher-vs-cash misrepresentation, change fee miscalculations, duplicate baggage charges.

Rental car charges & damage claims

"They billed me for damage on a car I returned in perfect condition."

What the travel agent catches: Damage claim disputes, CDW coverage conflicts, unauthorized add-on fees, fuel charge overages, undisclosed post-return billing.

International telecom & roaming

"My phone bill from the trip is four times what I expected."

What the travel agent catches: Roaming rate mismatches against carrier terms, data overage miscalculations, international call billing errors, fee disclosure violations.

Travel insurance denials

"My claim was denied but the policy language suggests I qualify."

What the travel agent catches: Denial language against policy terms, documentation gap analysis, excluded coverage misrepresentation, appeal grounds under the policy.

Restaurant & tourism overcharges

"The gratuity was already included but they added another service line."

What the travel agent catches: Double-charged gratuity, undisclosed service fees, menu price mismatches, mandatory charge disclosures under local consumer law.

+ Five languages · One engine

Catch it before you fly home.

ShieldEngine™ reads hotel folios, rental contracts, and travel bills in English, Portuguese, German, French, and Spanish. The travel specialist reads the document in the language it was written, finds the violations, and drafts a dispute letter in the vendor's language — ready while you're still in country.

5Languages read & written

~90sPer document

Any currencyEUR · GBP · JPY · MXN · BRL

Paradores Madrid — Estancia #4421ES → EN

Alojamiento (3 noches)

€420,00

Tasa turística

€9,00

Servicio habitación — duplicado

!€45,00

Minibar — no consumido

!€28,00

Forward the bill from the hotel lobby.

No app to install. Works from any browser on any device. Two free scans monthly, no credit card required.

Start free scan →See how it works

— Start free —

The next travel bill will have something wrong in it.

Two free scans monthly, no credit card required. Upload any document from any country and ShieldEngine™ tells you what it says — and whether you're owed money back.

Start free scan →See pricing

Warnvo — ShieldEngine™ Consumer Protection | Scan Bills & Fight Fraud