MailStream vs PostBridge
MailStream
mailstream.appPostBridge
postbridge.aiSide by side
| Figure | MailStream | PostBridge |
|---|---|---|
| Price from | — | $39/mo |
| Free plan | — | — |
| Free trial | — | Yes |
| Open source | — | — |
| Web | Yes | Yes |
| iOS | — | Yes |
| Android | — | Yes |
| API | Yes | Yes |
| Plans published | 0 | 2 |
| Spec score · Direct Mail Automation Software | 7.3 (#18) | 7.9 (#10) |
| Automation | The REST API and MCP server support sending, tracking, address verification, and creative generation. | PostBridge offers REST API endpoints, MCP tools, GPT Actions, SDKs, and agent workflows for postal automation. |
| Integrations | The integrations page describes Planning Center as available and lists several others, including Shopify, Zapier, Make, and n8n, as coming soon. | The site lists integrations including Clio, QuickBooks, Salesforce, HubSpot, Zoho Books, Zoho Invoice, Harvest, Google Sheets, Airtable, Google Drive, OneDrive, Dropbox, SharePoint, Google Docs, and Canva. |
| Product | MailStream provides a self-serve platform, REST API, and MCP server for sending physical postcards and letters. | PostBridge lets teams upload a PDF or connect a workflow so it can print and mail business documents while keeping tracking and mailing records together. |
| Support | The security page says MailStream will share SOC 2 reports, complete security questionnaires, and arrange calls with its security team. | The site lists support at [email protected]. |
Plans
PostBridge
- Business/Profile$39 a month
- Enterprise & high-volume mailPriced on request
In their own words
MailStream
MailStream provides a self-serve platform, REST API, and MCP server for sending physical postcards and letters domestically. Postcards are offered in 4×6, 6×9, and 6×11 inch sizes, while letters use HTML templates or uploaded PDFs in white #10 double-window envelopes. A browser HTML and CSS editor supports personalized designs, reusable templates, and print proofs. Variable fields can add names, offer codes, QR links, account numbers, and balances. MailStream says it CASS-verifies addresses before printing and flags invalid or incomplete entries. USPS Intelligent Mail barcodes expose status through the dashboard, API, or webhooks. Printing and USPS handoff are listed at 1 to 2 business days, for campaigns targeting 10 to 100,000 addresses. Integrations include Shopify, Zapier, Make, n8n, and HTTP tools. The hosted MCP server lists 27 tools. A free plan is available; paid access starts at $99/mo. Security features include TLS 1.2 or higher, AES-256 at-rest encryption, annual SOC 2 Type 2 audits, and HIPAA handling with BAAs.
PostBridge
PostBridge helps teams print and mail business documents from PDFs or connected workflows while keeping tracking and mailing records together. Its workspace supports letters, postcards, stamps, shipping labels, tracked delivery, verified delivery, and address verification. A team reviews the quote, and a member must approve a job before it prints. Connections include Clio, QuickBooks, Salesforce, HubSpot, Zoho Books, Google Sheets, Airtable, Google Drive, OneDrive, Dropbox, SharePoint, Google Docs, and Canva. Postal automation is available through REST API endpoints, MCP tools, GPT Actions, SDKs, and agent workflows. PostBridge serves the United States, United Kingdom, and France through USPS, Royal Mail, and La Poste. It is available on web, iOS, Android, and inside ChatGPT. The Business/Profile plan costs $39 a month; it includes five licensed Team members, unlimited free viewers, and separately charged postal usage. An eligible workspace receives one 14-day first trial; a qualifying carrier-QR first trial lasts 28 days. Proof documents can be downloaded for seven years, while letter content and uploaded files have shorter retention periods.