PostGrid review

PostGrid is an API-first service for teams that send letters, postcards and checks programmatically, whether invoices, statements or marketing mail. The Starter plan costs $0 per month and covers up to 500 mailings and 50 checks a month for 1 user and 10 templates, with published per-piece prices that include printing and postage: $0.902 for a 4x6 First Class postcard, $1.059 for a B&W First Class letter and $1.18 for a check. Certified Mail, return receipts and USPS Priority Mail express delivery are priced on the same page. Integration pages cover Salesforce, HubSpot, Zapier, Marketo, QuickBooks, Klaviyo, ActiveCampaign, Customer.io and Stripe, and PostGrid also sells address verification. Enterprise unlocks unlimited users, HIPAA compliant mailing, NCOA, custom envelopes and SSO at a custom price. Marketers without developers will find the workflow less guided than Postalytics, and anything beyond 500 pieces a month means talking to sales.

Who it is for

Developers and finance teams sending transactional and marketing mail through an API

Price

Free Starter plan up to 500 mailings per month, paying per piece; Enterprise is a custom quote.

Starter $0 /month Up to 500 Mailings/month
Quoted from the vendor pricing page on November 12, 2026.

Key features

• Letter, postcard and check APIs, with Certified Mail at $6.94 and express USPS Priority Mail delivery
• Starter rates of $0.902 per 4x6 First Class postcard and $1.059 per B&W First Class letter, including postage
• Integrations listed for Salesforce, HubSpot, Zapier, Marketo, QuickBooks, Klaviyo and ActiveCampaign
• Address verification for the US and Canada and an international API covering 245+ countries
• Enterprise adds HIPAA compliant mailings, NCOA, custom envelopes, SSO and user roles

Strengths and weaknesses

• Strength: Starter costs $0 per month for up to 500 mailings, with a test mode before going live
• Strength: Per-piece prices include printing, processing and postage
• Strength: Separate US, Canada, UK and Australia sites for local mailing
• Weakness: Starter has 1 user, 10 templates and a 50 checks per month cap
• Weakness: Mail over 500 pieces a month on Starter incurs overage fees
• Weakness: Self-mailer and Enterprise rates are only available from sales

Key facts

• Free plan: Starter, up to 500 mailings per month
• Paid plan: Enterprise, custom quote
• 4x6 postcard: $0.902 First Class on Starter
• Countries: US, Canada, UK, Australia

Where it ranks

PostGrid is No. 6 in our Best Direct Mail Software verdict.