A postcard API lets a business trigger a printed postcard the same way it would trigger an email or a text message: from a cart abandonment, a win-back window, a lead status change, or a scheduled campaign. A mailing service does the same job without any code, taking a design and a mailing list and handling printing, addressing, and postage directly.
This guide compares 12 providers that businesses commonly evaluate when they need to send postcards at scale, whether for acquisition marketing, customer retention, or event and reminder mailings. The comparison looks at how each one handles postcards specifically, along with API access, personalisation, tracking, integrations, and pricing transparency.
TL;DR
- Postcard API and mailing services range from developer-first APIs to full-service agencies and programmatic, intent-triggered platforms. The right fit depends on whether the team wants to build automation, manage campaigns through a dashboard, or hand production off entirely.
- PostGrid, Lob, ClickSend, PostalMethods, and Postalytics are built around triggering postcards programmatically through an API.
- PebblePost and PostPilot specialise in postcard-only automation, one for intent-based acquisition and one for Shopify-triggered e-commerce campaigns.
- PostcardMania and LetterStream offer managed or semi-managed postcard production, while Quadient’s strength is broader document and customer communications automation rather than postcard campaigns specifically.
- Sendoso and Reachdesk can include postcards as part of a gifting program, but neither is a dedicated postcard API or mailing service.
1. PostGrid print and mail
Best for: Teams that need to automate personalised postcard campaigns from a CRM, e-commerce platform, or internal application.
PostGrid Print & Mail API provides a digital-to-physical communications infrastructure that enables businesses to turn events and data from their existing systems into printed postcards. Instead of preparing mailing lists and coordinating production manually, teams can configure workflows that move a postcard from digital creation to physical delivery automatically.
Businesses can trigger postcards based on actions such as an abandoned cart, a lead-status update, a customer milestone, or a scheduled campaign. Templates and variable data enable each piece to reflect recipient-specific information while maintaining a consistent design across individual sends and larger campaigns.
Teams can also use the same infrastructure for broader outreach through the direct mail marketing services by PostGrid, allowing postcard automation to operate as part of a connected physical communications strategy rather than as an isolated mailing process.
Pros
- Provides both a postcard API and a dashboard for technical and non-technical teams
- Includes built-in address verification, delivery tracking, QR codes, and PURLs
- Integrates with Salesforce, HubSpot, Klaviyo, Zapier, Make, Shopify, Stripe, and other business applications
- Supports postcards alongside letters, checks, self-mailers, and additional physical communication formats
- Handles individual triggered postcards and large batch campaigns using the same platform
Cons
- Enterprise custom-plan pricing is not publicly listed and requires a sales conversation
- The platform is best suited to teams looking for a scalable, long-term solution rather than a basic one-off postcard service.
2. Sendoso
Best for: Sales and marketing teams that want to include postcards as part of a broader gifting and account-based marketing program.
Sendoso combines gifting, events, and direct mail into a single platform, and a postcard can be one element of a larger send alongside eGifts or physical items. It is not built as a standalone postcard API or mailing service, and sends are typically triggered from Salesforce, HubSpot, or Marketo workflows.
Sendoso handles fulfillment end to end across more than 160 countries. Pricing requires contacting sales.
Pros
- Fulfillment handled end to end across gifting and direct mail
- Native integrations with Salesforce, HubSpot, and Marketo
- Strong fit for relationship marketing and ABM programs
Cons
- Not a dedicated postcard API or mailing service
- Not built for high-volume, postcard-only campaigns
- Pricing is not publicly listed
3. Reachdesk
Best for: Account-based marketing teams running gifting programs where a postcard is one touchpoint among several.
Reachdesk is built around CRM-triggered gifting and direct mail for account-based marketing. Postcards can be included in a campaign, but the platform is not designed as a dedicated postcard-sending API.
Integrations with Salesforce, HubSpot, and Marketo allow campaigns to launch from existing CRM triggers. Pricing requires contacting sales.
Pros
- Purpose-built for CRM-triggered ABM gifting campaigns
- Fast integration setup with Salesforce, HubSpot, and Marketo
Cons
- Not a dedicated postcard API or mailing service
- Narrower use case than platforms built specifically around postcard production
- Pricing is not publicly listed
4. PebblePost
Best for: Brands running programmatic, intent-triggered postcard campaigns based on website behaviour.
PebblePost runs programmatic direct mail that uses website visit and browsing intent data to automatically trigger postcard sends, connecting online behaviour to a physical mail touchpoint without manual list building. Campaigns are typically used for prospecting and acquisition rather than retention or transactional mail.
Because the platform is postcard-focused, it fits acquisition-style marketing well but is not built for other mail formats. Pricing requires contacting sales.
Pros
- Automated, intent-triggered postcard sends without manual list building
- Useful for scaling prospecting and acquisition campaigns
Cons
- Postcard-only format limits use for other mail types
- Pricing is not publicly listed
5. PostcardMania
Best for: Businesses that want postcards designed, printed, and mailed by a full-service agency.
PostcardMania is a postcard specialist that handles graphic design, printing, mailing list acquisition, and mailing in-house. Every Door Direct Mail (EDDM) is also supported for businesses that want to reach every address in a chosen area without a purchased mailing list.
An optional add-on syncs matching Google, Facebook, and Instagram ads to the same targeted prospects receiving postcards. Because PostcardMania operates as a managed service, it suits businesses that want hands-on design help over teams that want to trigger postcards programmatically. Pricing requires contacting sales.
Pros
- Full-service design, printing, and mailing handled in-house
- EDDM support for area-wide mailings without a purchased list
- Optional digital ad sync to reinforce postcard campaigns
Cons
- Managed-service model rather than a self-serve API
- Less suited to teams that want to trigger postcards from their own systems
- Pricing is not publicly listed
6. PostPilot
Best for: Shopify and e-commerce brands running postcard campaigns triggered by purchase behaviour.
PostPilot is a postcard platform built specifically for Shopify and e-commerce brands. Trigger-based campaigns can be set up around behaviours like abandoned carts, birthdays, or win-back windows, with postcards personalised using a customer’s name, past purchases, or loyalty data pulled directly from the store.
The platform integrates natively with Shopify and Klaviyo and provides real-time tracking of attributed revenue by campaign. Pricing is per postcard sent, at roughly $0.67 per piece as of 2026, including printing and postage, rather than tiered subscription plans.
Pros
- Deep native integration with Shopify and Klaviyo
- Real-time, revenue-attributed tracking by campaign
- Simple per-card pricing with no subscription tiers
Cons
- Postcard-only, with no support for letters or other mail formats
- Built specifically for e-commerce, less suited to other industries
7. LetterStream
Best for: Organisations that want postcards mailed through a dedicated print-to-mail service, with no minimums.
LetterStream offers two postcard sizes, a Small or Express postcard and a Large or Pro postcard, designed and mailed through its online dashboard. Small postcards start at $0.87 each and Large postcards start at $1.26 each, with printing, postage, and mailing included and no minimum order or monthly fee.
Postcards are typically ordered through the dashboard or web portal, while LetterStream’s API is built primarily for automating letters and Certified Mail from an external system. Pricing is published, which is more transparent than most providers in this comparison.
Pros
- Published postcard pricing by size, with no minimums or monthly fees
- Built to handle anything from one piece to tens of thousands
- States most mail is delivered within two business days with tracking
Cons
- Postcards are ordered through the dashboard rather than a dedicated postcard API
- Less flexible for campaign-style, multi-touch automation than dashboard-native platforms
8. PostalMethods
Best for: Developers who want a simple, low-cost API for sending both letters and postcards.
PostalMethods offers a RESTful API for sending letters and postcards, along with a web-based portal for teams that prefer not to write code. A free developer account is available for testing, and going live only requires a prepaid card starting at $10, with no contracts or hidden fees.
The platform is intentionally simple, which suits smaller organisations or developers building a narrow mailing feature rather than teams that need a full campaign management dashboard. Pricing is pay-as-you-go.
Pros
- Simple, low-cost entry point with a free developer account
- REST API supports both letters and postcards
- No contracts, minimums, or hidden fees
Cons
- Narrower feature set than larger campaign or CCM platforms
- Less suited to teams that need advanced personalisation or campaign workflows
9. Lob
Best for: Engineering teams that want to build postcard automation directly into an application.
Lob is an API-first platform built to trigger postcards, letters, and checks from application events, such as a new customer signing up or a cart being abandoned. The platform is SOC 2 certified and states it uses encryption in transit and at rest.
Because Lob is developer-oriented, it suits technical teams comfortable building against an API, though organisations wanting a fuller marketing dashboard may need to pair it with additional tools. Pricing is not publicly listed.
Pros
- API-first automation for triggered postcards from application events
- SOC 2 certified, with encryption in transit and at rest
Cons
- Developer-oriented, with less built-in support for non-technical marketers
- Pricing is not publicly listed
10. ClickSend
Best for: Teams that want a pay-as-you-go postcard API alongside SMS, voice, and email.
ClickSend’s post tool sends physical postcards and letters through an API, with the platform handling printing, addressing, and mailing. The platform integrates with more than 100 third-party tools, including Zapier and Shopify, and pricing is pay-as-you-go with no minimum volumes.
One consideration: ClickSend has stopped offering its Post (physical mail) service to new customers, though existing customers can continue using it, so teams should confirm current availability before choosing this option.
Pros
- Pay-as-you-go pricing with no minimum volume
- Over 100 third-party integrations, including Zapier and Shopify
- Postcards and letters available from the same API
Cons
- ClickSend is no longer onboarding new customers for its Post service, per public reporting
- Postcards are one of several channels on the platform rather than the core focus
11. Postalytics
Best for: Marketing teams that want to send personalised postcards from CRM data with SDK support in multiple programming languages.
Postalytics’ Postcard API supports sending personalised postcards with variable data based on a recipient’s name, purchase history, or other CRM fields. The company offers SDKs in Python, Node, Rust, Java, Go, and C#, along with webhooks that report printing, transit, and delivery events in real time.
Tracking includes USPS Intelligent Mail Barcode data, along with personalised QR codes and URLs for response measurement. Pricing is not publicly listed.
Pros
- Postcard API with SDKs in six programming languages
- Strong personalisation through variable data
- Webhook-based tracking across the full mailing lifecycle
Cons
- Oriented toward marketing campaigns rather than transactional mail
- Pricing is not publicly listed
12. Quadient
Best for: Large enterprises that want postcards folded into a broader document automation and customer communications platform.
Quadient’s core strength is customer communications management: personalised, compliant documents delivered across print and digital channels, with automated postage calculation, address verification, and delivery tracking built into its mailing operations. Postcards can be part of that broader mix, but Quadient is not positioned as a dedicated postcard API or campaign tool the way purpose-built postcard platforms are.
Because it is built for enterprise-scale document workflows, implementation is typically more involved than a standalone postcard API. Teams whose primary need is postcard campaigns specifically may find a dedicated platform a better fit. Pricing requires contacting sales.
Pros
- Automated postage, address verification, and delivery tracking built into mailing operations
- Omnichannel delivery across print and digital from one platform
- Built for high-volume, enterprise-scale document workflows
Cons
- Not positioned as a dedicated postcard API or campaign tool
- Enterprise-scale implementation, typically more involved than a lightweight API
- Pricing requires contacting sales
How to choose a postcard API or mailing service
Start with how the postcards will be triggered. Campaigns driven by CRM or e-commerce events usually call for an API, while one-off or manually scheduled sends work fine through a dashboard or a managed service. Next, check personalisation needs. Variable data and dynamic images matter for response rates, and not every platform supports them to the same depth.
From there, weigh integration requirements against the existing tech stack, along with tracking and attribution needs, since some platforms tie postcard sends directly to revenue while others only confirm delivery. Finally, compare pricing structure. A few providers publish per-piece rates, while most require a sales conversation for volume-based pricing.
Key takeaways
- Postcard sending splits into three broad approaches: developer-first APIs, postcard-specialist platforms, and full-service agencies. Match the approach to team resources and campaign type.
- Purpose-built postcard platforms like PebblePost and PostPilot offer deep automation for a single format, while broader CCM platforms like Quadient are stronger for document-heavy, multi-channel programs.
- Published, per-piece pricing is rare in this category. LetterStream and PostPilot are among the few providers with public rates, which can simplify budgeting for smaller senders.
- Gifting platforms like Sendoso and Reachdesk can send postcards as part of a campaign, but neither is built as a dedicated postcard API or mailing service.
- PostGrid is the only platform in this comparison offering both an API and a dashboard for postcards, alongside address verification, tracking, and support for other mail formats in the same account.
Final recommendation
For businesses that need a single platform to trigger postcards programmatically, with tracking and address verification built in, PostGrid is the strongest overall choice in this comparison. It connects to common business systems through an API and integrations, supports both one-off postcards and large batch campaigns, and can handle other mail formats from the same account when needed.
That said, the best fit depends on the use case. Shopify-native e-commerce brands running purchase-triggered campaigns may prefer PostPilot, while brands focused purely on intent-based acquisition may lean toward PebblePost. Businesses that want postcards designed and mailed without building anything themselves may prefer PostcardMania or LetterStream. Developer teams that want a narrower, code-first tool may choose Lob, ClickSend, or PostalMethods. And large enterprises whose postcard needs sit inside a broader document automation program may find Quadient the better fit despite its more general focus. Matching the platform to how postcards get triggered, required personalisation, and budget transparency matters more than picking the single most feature-rich option.
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