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Head-to-head · Postal Presort Software

AccuZIP6 vs Mailers+4

  • Updated Oct 2026
  • Both researched from official sources
  • 3 checks side by side
Higher score AccuZIP6 #2 in Postal Presort Software 8.7/10 Pricing on request ✓ 2 of 2 features Visit AccuZIP6
Mailers+4 #8 in Postal Presort Software 7.6/10 Pricing on request ✓ 2 of 2 features Contact Window Book

AccuZIP6 leads on 0 checks, Mailers+4 on 0, and 3 are even. Who comes out ahead on the 3 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreAccuZIP6 · 8.7/10

AccuZIP6 scores higher on our rubric for postal presort software: 8.7 against 7.6 out of 10; our editors rank them #2 and #8.

On automation options, AccuZIP6 gives you Scheduled where Mailers+4 offers Manual.

AccuZIP6 is the better fit for windows teams needing end-to-end USPS presort. Mailers+4 is the better fit for windows mailers needing core commercial USPS prep.

  • AccuZIP6 fits best

    Windows teams needing end-to-end USPS presort

  • Mailers+4 fits best

    Windows mailers needing core commercial USPS prep

Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.

Side by side

Feature AccuZIP6 8.7/10 Visit ↗ Mailers+4 7.6/10 Visit ↗
At a glance
Editor score 8.7 7.6
Ranking #2 in Postal Presort Software #8 in Postal Presort Software
Best for Windows teams needing end-to-end USPS presort Windows mailers needing core commercial USPS prep
Pricing model Paid Paid
Starting price Pricing on request Pricing on request
Free plan — Not checked yet
Free trial — —
Deployment Desktop Desktop
Platforms Windows Windows
Built for Small business, Mid-market, Enterprise Small business, Mid-market, Enterprise
Features AccuZIP6 2/2 · Mailers+4 2/2
Address validation ✓ ✓
Postal documentation ✓ ✓
Specs
Mail types First-Class Mail, Periodical Mail, USPS Marketing Mail, Bound Printed Matter; postcards, letters, flats, parcels First-Class Mail; USPS Marketing Mail; Periodicals; Bound Printed Matter
Presort levels Carrier route, 5-digit, 3-digit, scheme, ADC/AADC, MADC/MAAD 5-digit; 3-digit; AADC; mixed AADC; carrier route
Supported platforms Windows desktop Windows desktop
Automation options Scheduled Manual
Our review
Pros
  • Verifies and standardizes addresses with CASS-certified processing
  • Presorts multiple USPS mail classes and formats, with Intelligent Mail barcodes
  • Creates postal statements and supports electronic documentation submission
  • Presorts First-Class Mail, USPS Marketing Mail, Periodicals and Bound Printed Matter
  • Supports address validation and five presort levels
  • Prepares postal documentation, containers, labels, reports and induction data
Cons
  • Windows desktop only
  • No free plan
  • Subscription pricing requires contacting sales
  • Mail processing is manual rather than automated
  • Runs as Windows desktop software
  • Pricing requires contacting Window Book
Our verdict

AccuZIP6 is desktop postal software for organizations preparing direct-mail lists and USPS mailings. Its workflow combines address verification and standardization, duplicate detection, presorting, barcode printing, and mailing…

Read the review →

Mailers+4 is Window Book’s desktop application for preparing commercial USPS mailings. It is aimed at organizations with recurring production mail operations, including service bureaus and in-house mailing departments, that need…

Read the review →
  1. AccuZIP6Postal Presort Software 8.7Pricing on request
  2. Mailers+4Postal Presort Software 7.6Pricing on request

Strengths and trade-offs

  • AccuZIP6 — where it wins

    • Verifies and standardizes addresses with CASS-certified processing
    • Presorts multiple USPS mail classes and formats, with Intelligent Mail barcodes
    • Creates postal statements and supports electronic documentation submission

    Where it doesn't

    • Windows desktop only
    • No free plan
    • Subscription pricing requires contacting sales

  • Mailers+4 — where it wins

    • Presorts First-Class Mail, USPS Marketing Mail, Periodicals and Bound Printed Matter
    • Supports address validation and five presort levels
    • Prepares postal documentation, containers, labels, reports and induction data

    Where it doesn't

    • Mail processing is manual rather than automated
    • Runs as Windows desktop software
    • Pricing requires contacting Window Book

More comparisons

All postal presort software comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update