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PostGrid Address Verification vs QuantumDigital

Both stand on postcard maker software. Which one you can start free with, which one lets you read the code, and what each costs once you pay.

PostGrid Address Verification

Free plan APISelf-hostedWeb

PostGrid supports address validation and enrichment across domestic and international workflows, with batch processing and several integration options. Compare monthly lookup allowances and overage rates with expected usage.

Visit PostGrid Address Verification

QuantumDigital

Free plan APIWeb

Choose QuantumDigital if you need online postcard production and mailing, campaign scheduling, or API ordering with a one-piece minimum. The main reason to look elsewhere is order scale: Print / Ship API orders require 20 pieces, while the three listed EDDM plans start at 25,000+ pieces.

Visit QuantumDigital

The facts

PostGrid Address VerificationQuantumDigital
Free planYesYes
Open sourceNot publishedNot published
Runs onAPI, Self-hosted, WebAPI, Web
Lowest paid planStandard Essential: $18 a monthSee the plans
Plans published65
MakerNot publishedNot published
Websitepostgrid.comquantumdigital.com
On postcard maker software#8 of 24#12 of 24

PostGrid Address Verification: what it does well

  • Verifies addresses against postal data in real time.
  • Supports batches of up to one million addresses.
  • Handles non-Latin scripts and Roman-script conversion.
  • Offers API, dashboard and self-hosted options.
  • Lists a 99.9% uptime SLA.

What to know first

  • Plans impose monthly lookup limits.
  • Additional lookup charges apply beyond plan allowances.
  • Standard Essential is limited to U.S. and Canada.
  • Standard Essential costs $18 a month, billed yearly.

QuantumDigital: what it does well

  • Use an uploaded design or choose from free postcard templates.
  • Schedule campaigns weekly, monthly, or quarterly in advance.
  • Target mailing areas around listed properties or use customer contacts.
  • Direct Mail API orders start at one piece.
  • Supports QR codes, SMS marketing, and variable-data personalization.

What to know first

  • Print / Ship API orders have a 20-piece minimum.
  • The three listed EDDM plans start at 25,000+ pieces.
  • Direct Mail API is priced at $0.85 per card.

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