Shipping software should reduce the work between an order and a delivered package. For one seller, that means inexpensive USPS and UPS labels. For another, it means importing orders from several stores, comparing carriers, automating service selection, handling customs data, and keeping customers informed.

This is a research-based comparison of current vendor documentation, not a hands-on test. Carrier rates, plan limits, surcharges, and features vary by origin, destination, parcel, account, and billing region. Run your own recent orders through a trial before choosing.

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Quick comparison

Platform	Best fit	Pricing approach	Main limitation to verify
Pirate Ship	US sellers wanting simple USPS and UPS labels	No software subscription; pay for labels	Narrower carrier and automation scope
Easyship	International ecommerce and multi-carrier comparison	Free plan; paid app plans and usage-based API options	Plan, shipment, API, and own-carrier-account limits
ShipStation	Multi-store operations needing automation	Paid plans by capability and shipment volume	Regional pricing and own-carrier fees
Shippo	Growing stores wanting an app plus API options	Free Starter; Pro from $17/month in the US	Free-plan label and user limits
EasyPost	Developers building shipping into a product	Usage-based API	Requires technical implementation
Stamps.com	US businesses combining mailing and parcel shipping	Subscription plus postage and services	Less relevant for global multi-carrier operations

No provider has one universally cheapest label. The useful comparison is total landed cost for your actual parcels plus the labor saved by integrations and automation.

Pirate Ship: simple US label buying

Pirate Ship currently states that the software is free, with no markup, minimum, or subscription fee; customers pay for USPS or UPS labels. Orders can be entered manually, imported by spreadsheet, or pulled from supported ecommerce integrations.

That makes it a strong baseline for a low-volume US seller. It is less suitable when the operation needs a broad international carrier network, sophisticated routing rules, warehouse controls, or an API-first architecture.

Best for: sellers whose core requirement is straightforward discounted USPS and UPS labels.

Easyship: international and multi-carrier workflows

Easyship combines a shipping dashboard and API. Its current product material lists a free app plan, integrations with major ecommerce stores and marketplaces, label generation, order synchronization, rate comparison across more than 550 courier services, tracking, returns, and international duties and taxes tooling. The platform also supports connecting eligible existing courier accounts on paid plans.

International shipping is the clearest differentiator in this comparison. Easyship can compare domestic and cross-border services, surface delivery estimates, and support duties-and-tax calculations rather than treating international orders as an afterthought. Store integrations include Shopify, WooCommerce, Squarespace, Wix, Amazon, eBay, and Etsy.

The free plan has no monthly subscription, but it still has usage and feature limits. Easyship’s 2026 API model is separate from postage: advanced endpoints use pay-as-you-go pricing on Free, while paid API plans start from $29/month with included calls and lower overage rates. Availability and plan values vary by country, so verify the live checkout for the shipping origin.

Compare Easyship’s current free and paid plans if international rate shopping, duties, or a wide carrier set are central to the workflow.

Best for: ecommerce businesses shipping across borders or wanting an app and API around the same multi-carrier platform.

ShipStation: multi-store automation

ShipStation is designed to centralize orders from multiple selling channels and apply repeatable shipping rules. Its current US plans start at $14.99/month for Starter and $29.99 for Standard, with prices increasing by shipment allowance. Starter includes three users, unlimited store connections, automated rate shopping, returns, and basic automations. Standard adds ten users, unlimited automations, own-carrier connections, exchanges, basic warehouse management, API access, and phone support.

The important caveat is regional and account-specific cost. Plan prices differ by country, and fees can apply when using your own negotiated carrier accounts. Model the exact shipment tier and carrier setup rather than relying on a starting price.

Best for: sellers managing several channels who need rules, batching, and a central operations dashboard.

Shippo: an accessible app with an API path

Shippo’s current US Starter plan is free for up to 30 labels per month and one user. It includes store connections, international shipping, automations, returns, tracking, and reporting; connecting an own carrier account costs $0.05 per label. Pro starts at $17/month and adds branded customer communications, more users, stronger support, and no own-carrier label fee.

Shippo is a practical middle ground between a basic label tool and a more operations-heavy platform. Confirm whether the app or API pricing applies, because those are separate buying decisions.

Best for: small stores that want a guided dashboard now and a broader integration path later.

EasyPost: developer-first shipping infrastructure

EasyPost is primarily a shipping API rather than a merchant operations dashboard. It provides programmatic access to rates, labels, tracking, address verification, and insurance across carriers. That flexibility is useful when shipping must be embedded in a custom application, but a non-technical merchant should not choose it merely because the headline model looks inexpensive.

Best for: engineering teams building and maintaining their own shipping workflow.

Stamps.com: mailing plus shipping

Stamps.com remains relevant for US businesses that print ordinary postage as well as parcel labels. Its plans combine postage printing and discounted carrier services with address, contact, pickup, tracking, and reporting tools. Postage, insurance, and optional carrier services are separate usage costs.

If the business sends both documents and parcels, check current Stamps.com plans and offer terms. A store focused on international ecommerce should compare its carrier and customs workflow against Easyship or ShipStation.

Best for: US offices and small businesses that need mailing tools alongside parcel shipping.

How to choose with real order data

Export 20 to 50 recent orders that represent the actual mix of zones, weights, dimensions, carriers, international destinations, and returns. During each trial, compare:

1. total label cost after residential, fuel, remote-area, dimensional-weight, and other adjustments;
2. store and marketplace synchronization;
3. rate-shopping and automation rules;
4. customs forms, HS codes, duties, and tax handling;
5. returns, tracking notifications, and branded pages;
6. own-carrier fees, users, shipment limits, API calls, and support;
7. the time required to process an ordinary batch and correct an exception.

The cheapest subscription can be the wrong choice if staff must repair imports or manually select every service. The most feature-rich platform can also be wasteful for a seller printing ten similar labels a week.

Recommendations by workflow

• Start with Pirate Ship for simple US USPS and UPS label buying.
• Shortlist Easyship for cross-border ecommerce, duties and taxes, or broad carrier comparison.
• Choose ShipStation when multi-store automation and operational controls matter most.
• Consider Shippo for a simpler app with a credible path to higher volume or API use.
• Use EasyPost when developers own a custom shipping experience.
• Compare Stamps.com when ordinary business mailing is part of the same job.

Your ecommerce platform choice affects the integrations available, and our Shopify pricing guide explains why shipping apps belong in the total platform budget.

FAQ

Is free shipping software really free?

It can have no software subscription, but labels, insurance, surcharges, adjustments, and some carrier or API functions still cost money. Free plans also have shipment, user, or feature limits.

Which platform is best for international shipping?

Easyship is a strong starting point because international carrier comparison, customs data, and duties-and-tax tooling are central to its positioning. ShipStation and Shippo also support international workflows; test the carriers and destinations you actually use.

Which option is best for Shopify?

First compare Shopify’s built-in labels with the external platforms. Add dedicated software when broader carriers, multiple stores, automation, international tools, or custom API workflows justify it.

Can a business use its own carrier account?

Several platforms allow it, but the eligible plan and extra fees differ. Confirm the fee for each label, carrier connection, or account before assuming your negotiated rate will remain the cheapest option.

Should a small business choose an API?

Only when it has a product or workflow that justifies development and maintenance. Most small merchants should begin with a supported dashboard and store integration.