100% Offline · No Cloud Upload · GDPR-Compliant

One letter per household —
instead of three to the same address.

"St." and "Street"? Same. "Smith-Jones" and "Jones"? Same household. ListenFix detects what Excel misses — spelling variants, hyphenated names, and related households. You decide who gets the letter. No Excel filter can do that.

Try for Free →Calculate Postage Savings
✓ Free trial — no credit card required✓ 30-day money-back guarantee✓ No account needed
The Problem

Excel Filters Are Costing You Real Money

"Remove Duplicates" in Excel only finds identical rows. Even fuzzy add-ins fail with hyphenated names, households, and swapped street names.

✕ Excel "Remove Duplicates"
12
duplicates found
  • ✕"St." vs. "Street" → not detected
  • ✕"Meyer" vs. "Mayer" → not detected
  • ✕"Dr." vs. "Doctor" → not detected
  • ✕"Smith-Jones" = separate household? → ignored
  • ✕Whitespace, special characters → ignored
€294.95 postage wasted per mailing
✓ ListenFix AI Analysis
0
duplicates found
  • ✓Fuzzy matching: typos, abbreviations
  • ✓AI detects semantic variants
  • ✓Hyphenated name recognition: "Smith-Jones" = "Jones"
  • ✓Household detection: one letter per address
  • ✓Postage report: exact savings in euros
€294.95 saved — from the very first mailing
Unique Selling Point

What ListenFix Detects — and No Excel Filter Can

Three real-world examples. Each one is invisible even to fuzzy add-ins — but a clear match for ListenFix.

🏠 Household Detection
❌ Excel sees
Thomas MayerRosenweg 12, 80331 München
Sandra Bauer-MayerRosenweg 12, 80331 München
→ 2 catalogs to the same household
✅ ListenFix detects
Sandra Bauer-MayerRosenweg 12, 80331 München✓ Household detected — one letter is enough
Thomas MayerRosenweg 12, 80331 MünchenDuplicate — same household
→ 1 catalog, half the cost
👤 Hyphenated Name Detection
❌ Excel sees
Dr. Marie Lefèvre-SchmidtLindenstr. 8, 50667 Köln
Marie SchmidtLindenstraße 8, 50667 Köln
→ 2 different people according to Excel
✅ ListenFix detects
Dr. Marie Lefèvre-SchmidtLindenstraße 8, 50667 Köln✓ Hyphenated name + abbreviation detected
Marie SchmidtLindenstr. 8, 50667 KölnDuplicate — same person
→ 1 recipient, correct salutation
🇫🇷 Chaotic Spelling
❌ Excel sees
Jean-Pierre DuboisRue de la Gare 14, 67000 Strasbourg
J.-P. Dubois14, rue Gare de la, 67000 Straßburg
→ 2 completely different addresses according to Excel
✅ ListenFix detects
Jean-Pierre DuboisRue de la Gare 14, 67000 Strasbourg✓ Swapped words + abbreviation detected
J.-P. Dubois14, rue Gare de la, 67000 StraßburgDuplicate — same address
→ 1 letter instead of 2, despite chaotic data
You decide who gets the letter. ListenFix automatically detects matching households, hyphenated names, and chaotic spellings — you choose which recipient stays. No Excel filter can do that — not even fuzzy add-ins.
Features

Six Reasons Organizations Switch from Excel to ListenFix

Desktop software that cleans your mailing list in minutes — no cloud, no risk.

🏠

Household Detection

ListenFix detects when multiple people live at the same address — even with different last names or hyphenated names. You decide who gets the letter. One catalog per household instead of two.

🤖

AI Duplicate Detection

A local AI model detects "St." vs. "Street", "Meyer" vs. "Mayer", "Dr." vs. "Doctor" and other variants that no filter finds.

🔒

100% Offline

Your data never leaves your computer. No cloud, no upload, no tracking. That's why you don't need a data processing agreement.

📊

Postage Savings Report

See instantly how much postage you save per mailing. In euros, black and white — perfect for management.

📁

Excel-Native

Drag & drop your .xlsx or .csv file. Export as a cleaned Excel file with markings. No training needed.

📍

Postal Code Validation

29 European countries. ListenFix checks every postal code against official databases — undeliverable addresses are flagged before you waste postage.

Data Privacy

Compliance Without Compromise

ListenFix was built for strict European privacy regulations. No data ever leaves your computer — period.

🛡️
GDPR
Art. 5, 25, 32
No cloud upload, no third-party data processing
⚖️
Professional Secrecy
Client Confidentiality
Safe for medical practices, law firms, accountants
🏛️
Tax Secrecy
Financial Data Protection
No disclosure of tax-relevant data
✅
No DPA Needed
No Data Processing Agreement
100% local = no contract with third parties required
💡 Why this matters: Cloud-based AI solutions cost €5–20 per cleaning run and require a Data Processing Agreement (DPA). With ListenFix? Zero ongoing costs, no DPA needed — your data stays on your computer.
How It Works

Clean Your List in 4 Simple Steps

Try for free — steps 1 to 3 are free. See the results before you decide.

1

Download Setup

Free download and install — under 2 minutes. Runs completely locally, no cloud needed.

2

Open File

Load your Excel file via drag & drop. ListenFix automatically detects name, address, and postal code columns.

3

AI Analyzes

Local AI checks every address: fuzzy matching, semantic analysis, normalization. In seconds.

4

Export & Save

Export the cleaned list as Excel. The postage report shows your savings in euros.

Download for WindowsVersion 2.0 · Free Trial · ~70 MB
macOS — Coming Soon
Postage Calculator

How Much Postage Are You Wasting?

Enter your list size and instantly see how much you can save per mailing.

%
€
€
Total waste per mailing
212.00 €
400 duplicate letters × (0.38 € postage + 0.15 € print)
With 4 mailings per year: 848.00 €/year
✓ ListenFix Starter costs €69 — and saves you €848.00 per year.
The Math

One Mailing — and ListenFix Has Paid for Itself

A typical mid-size mailing: 10,000 addresses, bulk mail, 4% duplicates.

📬
400
duplicate letters with 10,000 addresses and 4% duplicate rate
💸
€212
wasted — 400 × (€0.38 postage + €0.15 print)
✅
from €69
for ListenFix — ROI from the very first mailing
With 4 mailings per year: over €800 saved. That's not a promise — it's arithmetic.
Pricing

Try First, Decide Later

Analysis is always free — see instantly how many duplicates are in your list. Only exporting the cleaned file requires a license.

Starter
Clean once, save immediately — perfect for associations and companies with 1–2 mailings per year.
€69one-time
  • ✓1 Export
  • ✓Valid for 90 days
  • ✓Up to 5,000 addresses
  • ✓Postage Savings Report
  • ✓1 Device
⭐ Recommended
Professional
For data-driven businesses, medical practices, and professionals who want full control of their postage costs.
€99/month
or €790/year (save 34%)
  • ✓Unlimited Exports
  • ✓Unlimited Addresses
  • ✓Postage Savings Report
  • ✓All Updates Included
  • ✓3 Devices
🆓 Analysis is always free — only the export requires a license.
Agency or mail house? Request a custom quote
Already a customer? Manage subscription →
0
matching algorithms — finds what Excel misses
0
data to the cloud — everything stays local
0 sec.
to your first analysis — no account, no credit card
15+
articles on address quality
29
European countries covered
100%
GDPR compliant
FAQ

Frequently Asked Questions

Yes — completely free and without a credit card! Download ListenFix and start your analysis right away. You'll see exactly how many duplicates are in your list and how much postage you can save. You only need a license when you want to export the cleaned list.
Yes, ListenFix is a desktop application for Windows. Download → double-click → done. The AI component (Ollama) is automatically set up on first launch — no configuration needed.
Yes. ListenFix reads .xlsx and .csv files — regardless of your Excel version. Simply drag & drop your file. The cleaned list is exported as a new Excel file.
Nothing. Your data stays on your computer. ListenFix works 100% offline — no upload, no cloud service, no tracking. That's why you don't even need a Data Processing Agreement (DPA).
After purchase, you'll receive a license key (e.g., ADDE-XXXX-XXXX-XXXX). Enter it once in ListenFix. That's it — your license is instantly active.
Yes, 30 days — no questions asked. If ListenFix doesn't deliver, you get your money back. Simply send us an email.
Excel's "Remove Duplicates" only finds identical rows. Fuzzy add-ins compare character similarity — but fail with addresses. ListenFix understands addresses: "St." = "Street", "Meyer" = "Mayer", "Dr. Smith" = "Doctor Smith", hyphenated names like "Smith-Jones" and even matching households — so each address only gets one letter instead of two.
ListenFix works for lists from 500 to over 100,000 addresses. Organizations with 5,000–50,000 addresses per mailing benefit the most — the typical mid-market volume where every duplicate immediately saves real money.
Cloud-based AI APIs cost €5–20 per cleaning run and require a Data Processing Agreement (DPA). ListenFix uses local AI on your computer — pay once and check unlimited lists afterward, with no ongoing costs. That's not only privacy-compliant, but also significantly cheaper.
Resources

Guides & Articles

Removing Address Duplicates: Why Excel Isn't Enough

Detecting Duplicates: 7 Methods for Clean Address Data

Optimizing Postage: 5 Strategies to Reduce Costs

All articles →

335 duplicates are waiting in your list.

Download ListenFix for free — and see in 30 seconds how much postage your organization is wasting.

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🆓 Analysis always free🔒 100% Offline↩️ 30-day money-back