Smarty
Zipcodestack
PostalDataPI
Geoco.io
Melissa Data Quality
Loqate
usZIPCodes.org
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

Firebase
Heroku
Parse
Kuzzle
Supabase
AppWrite
AWS Amplify
Low code backend to build apps faster and scale easily.
Which is more popular?
Based on our record, Back4App seems to be more popular. It has been mentioned 1 time since March 2021.
Website, pricing, platforms and company facts side by side.
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ZIP
ZIP Code API
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|---|---|---|
| Website | zip-codes.com | back4app.com |
| Pricing | — | |
| Company | Startup from the United States · 2026 | — |
| Listed in |
In their own words, as submitted to SaaSHub.

API for US ZIP, ZIP+4, and Canadian postal code data. One unified endpoint set covers North America — no separate APIs by country or data type. What it does Address validation and standardization — production-grade parser with ZIP+4 append, refreshed monthly Radius search — centroid haversine and...
Back4App supports developers and companies to accelerate backend development, improve development productivity, reduce time to market, and scale applications without managing infrastructure.
What each product offers, as listed by its team.

Possible disadvantages
An editorial look at what each product does well and who it suits.

Overall verdict
Why this product is good
Recommended for
Overall verdict
Why this product is good
Recommended for
Back4App is recommended for startups, indie developers, and enterprises that require a reliable and cost-effective backend service to rapidly develop and deploy applications. It is ideal for those who prefer not to manage their own servers or infrastructure and for projects that need quick scalability and real-time data management, such as social apps, mobile applications, and IoT solutions.
Walkthroughs and reviews on video.
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Serverless GraphQL #01 - Introduction to GraphQL on Parse using Back4App
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How often each product is chosen within a category, 0–100% relative to the other.

Share your experience with using ZIP Code API and Back4App. For example, how are they different and which one is better?
External articles and on-site reviews we used to compare the two products.

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Documentation and Guides:Official Docs: Refer to the official documentation of your chosen platform. For instance, Back4App and Parse have extensive guides on migrating from Firebase.Community Forums: Engage with...
Back4app is undoubtedly one of the most intriguing and high-quality free platforms for developing mobile and online apps.
Companies and development teams can definitely choose Back4App, a Firebase alternative, because it can process more than 3.5 billion requests on a monthly basis. Correspondingly, if you want Firebase-like services...
Recommendations tracked on public social media and blogs since March 2021.

Tracking ZIP Code API since May 2026.
I'm using back4app.com which is a cloud service for parse server, you can fire cloud code using node. Recently they introduce containers, but I didn't use it. Source: over 3 years ago
When comparing ZIP Code API and Back4App, you can also consider the following products.

Smarty provides address validation, autocomplete, geocoding and reverse geocoding services covering addresses in over 240+ countries.
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Firebase is a cloud service designed to power real-time, collaborative applications for mobile and web.
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Free Zip Code API - Free Postal Code Validation | Zipcodestack
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Agile deployment platform for Ruby, Node.js, Clojure, Java, Python, and Scala. Setup takes only minutes and deploys are instant through git. Leave tedious server maintenance to Heroku and focus on your code.
Compare Heroku to ZIP Code API or Back4App:

The most affordable postal code API. 240+ countries, sub-5 ms responses. Simple, elegant, transparent.
Compare PostalDataPI to ZIP Code API or Back4App:

Build applications faster with object and file storage, user authentication, push notifications, dashboard and more out of the box.
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