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ZIP Code API VS Captain

Compare ZIP Code API VS Captain and see what are their differences

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ZIP Code API logo ZIP Code API

REST API for US ZIP, ZIP+4, and Canadian postal codes. Single unified endpoint covers address validation and standardization, radius search (centroid haversine and true spatial polygon intersection), point-to-point distance, autocomplete/typeah

Captain logo Captain

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  • ZIP Code API Landing page
    Landing page //
    2026-05-21

API for US ZIP, ZIP+4, and Canadian postal code data. One unified endpoint set covers North America โ€” no separate APIs by country or data type.

What it does

  • Address validation and standardization โ€” production-grade parser with ZIP+4 append, refreshed monthly
  • Radius search โ€” centroid haversine and true spatial polygon intersection. Returns ZIPs/FSAs within range, with per-result pct_inside overlap percentage for spatial queries
  • Unified lookup endpoint โ€” accepts US ZIP, ZIP+4, Canadian FSA, full Canadian postal codes, or latitude/longitude inputs
  • Autocomplete/typeahead โ€” cities, counties, metros, states, FSAs, ZIPs
  • Point-to-point distance โ€” between any two postal points
  • Census ACS demographics โ€” 2011โ€“2024, 542 fields per ZIP across income, education, housing, social, and economic profiles
  • Boundary lookups โ€” Census tracts, congressional districts, state legislative areas, school districts โ€” with computed intersection percentages per ZIP

What makes it different

  • Licensed commercial data โ€” not commodity or scraped sources
  • Canadian postal coverage โ€” most peers in this space are US-only
  • True spatial radius โ€” not just centroid haversine
  • 14 years of historical ACS depth via API โ€” unusual outside of raw Census downloads
  • One endpoint for all of North America โ€” no country-detection or input-routing logic to maintain on the client side

Pricing

  • Free โ€” 2,500 lookups/day, no credit card required, no expiry
  • Developer โ€” $49/mo, 100K credits, 300/min
  • Professional โ€” $149/mo, 350K credits, 300/min
  • Business โ€” $499/mo, 1.5M credits, 600/min
  • Credit packs โ€” one-time, from 25K ($19) up to 2M ($799)

Resources

  • Captain Landing page
    Landing page //
    2023-09-04

ZIP Code API features and specs

  • Comprehensive ZIP Code Data
    The ZIP Code API from zip-codes.com provides extensive data including ZIP code details, city information, state data, and geographic coordinates, making it a thorough resource for location-based lookups.
  • Multiple Lookup Options
    The API supports various types of lookups including ZIP code to city/state, city/state to ZIP code, distance calculations between ZIP codes, and radius searches, offering flexible querying capabilities.
  • Easy Integration
    The API uses standard REST-based HTTP requests and returns data in commonly used formats like JSON and XML, making it straightforward to integrate into most applications and programming languages.
  • Distance and Radius Calculations
    The API includes built-in functionality for calculating distances between ZIP codes and finding ZIP codes within a specified radius, which is valuable for store locators, shipping estimates, and proximity-based features.
  • Well-Documented Endpoints
    The API provides clear documentation for its various endpoints and parameters, helping developers understand available features and implement them correctly without extensive trial and error.

Captain features and specs

  • User-Friendly Interface
    Captain provides an intuitive and easy-to-navigate interface, which simplifies the process of creating and managing tasks.
  • Collaborative Tools
    Includes various collaborative features that enhance team communication and task delegation.
  • Customizable Workflows
    Offers a range of customization options for workflows, allowing teams to adapt the tool to their specific needs.
  • Integrations
    Supports integration with numerous third-party applications, boosting its utility within existing tool ecosystems.
  • Real-Time Updates
    Provides real-time updates and notifications, ensuring all team members are on the same page.

Possible disadvantages of Captain

  • Cost
    The premium features can be relatively expensive, potentially limiting access for smaller teams or startups.
  • Learning Curve
    Despite its user-friendly design, some users report a learning curve when first adopting the platform.
  • Limited Mobile Functionality
    The mobile application could be more robust, with some features being less accessible or not available.
  • Customer Support
    While generally responsive, some users have cited occasional delays in customer support response times.
  • Feature Overload
    The vast array of features can be overwhelming for new users, leading to potential underutilization of the toolโ€™s capabilities.

Analysis of ZIP Code API

Overall verdict

  • ZIP Code API from zip-codes.com is a solid, reliable choice for developers and businesses needing accurate US and Canadian postal code data, offering a straightforward RESTful interface with regularly updated databases.

Why this product is good

  • Provides accurate and frequently updated ZIP code, city, state, and geographic data
  • Offers a simple RESTful API that is easy to integrate into web and mobile applications
  • Supports features like ZIP code lookup, radius search, and distance calculations
  • Includes both US ZIP codes and Canadian postal codes for broader coverage
  • Backed by an established data provider with a long track record in postal data

Recommended for

  • Developers building address validation or autofill features
  • E-commerce platforms needing shipping and location-based calculations
  • Businesses performing geographic or radius-based store locators
  • Applications requiring reliable US and Canadian postal data
  • Marketing and logistics teams that need regional or demographic targeting

Analysis of Captain

Overall verdict

  • Overall, Captain is a well-regarded platform with positive reviews from users. It is praised for its ease of use, reliability, and the value it brings to teams needing comprehensive project management solutions.

Why this product is good

  • Captain (onecaptain.com) is considered to be a good platform because it offers a range of productivity tools and features designed to streamline project management and collaboration. It integrates well with various other tools and provides an intuitive user experience. Its ability to centralize communication and organize tasks effectively makes it a popular choice among teams looking to enhance efficiency.

Recommended for

  • Small to medium-sized businesses
  • Teams looking for improved project collaboration
  • Users seeking an effective task management system
  • Organizations wanting integration with other software tools

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Category Popularity

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Zip Lookup
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AI
0 0%
100% 100
APIs
100 100%
0% 0
Productivity
0 0%
100% 100

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What are some alternatives?

When comparing ZIP Code API and Captain, you can also consider the following products

Smarty - Smarty provides address validation, autocomplete, geocoding and reverse geocoding services covering addresses in over 240+ countries.

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Zipcodestack - Free Zip Code API - Free Postal Code Validation | Zipcodestack

Playground AI - Stable diffusion level generation with 1000 free pics a day

PostalDataPI - The most affordable postal code API. 240+ countries, sub-5 ms responses. Simple, elegant, transparent.

Midjourney - Midjourney lets you create images (paintings, digital art, logos and much more) simply by writing a prompt.