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

Supabase
Android Studio
AppWrite
Back4App
Xcode
Vercel
Socket.io
Firebase is a cloud service designed to power real-time, collaborative applications for mobile and web.

Which is more popular?
Based on our record, Firebase seems to be more popular. It has been mentioned 286 times 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 | firebase.google.com |
| Pricing | — | |
| Company | Startup from the United States · 2026 | Startup from the United States |
| 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...
No description of Firebase yet.
What each product offers, as listed by its team.

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

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Why this product is good
Recommended for
Overall verdict
Why this product is good
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Is Firebase a Good Long Term Solution?
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External articles and on-site reviews we used to compare the two products.

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Firebase: Google’s longstanding BaaS platform. Popular for mobile and web backends, real-time data, and increasingly AI-assisted development through Firebase Studio. Strong for rapid app delivery, but more complex...
It proudly calls itself the “open-source Firebase alternative,” and for good reason. Supabase gives you the power of a PostgreSQL database, authentication, instant APIs, real-time subscriptions, and more – all without...
Data Export:Backup Your Data: Begin by creating backups of all your data stored in Firebase. This ensures you have a safe copy in case anything goes wrong during the migration.Export Data: Use Firebase's data export...
Recommendations tracked on public social media and blogs since March 2021.

Tracking ZIP Code API since May 2026.
Back in 2019, Google Firebase was becoming very popular. I was especially interested in the real-time capabilities — they had just launched Firestore and I wanted to give it a try. I thought it would be fun to build a small tool for my... - Source: dev.to / 6 months ago
Then you log into Firebase and see it: The dreaded red box. Your APNs certificates have expired. - Source: dev.to / 6 months ago
Persistence: Firebase for seamless Google Authentication and session management. - Source: dev.to / 7 months ago
When comparing ZIP Code API and Firebase, 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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Free Zip Code API - Free Postal Code Validation | Zipcodestack
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Android development environment based on IntelliJ IDEA
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The most affordable postal code API. 240+ countries, sub-5 ms responses. Simple, elegant, transparent.
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Appwrite provides web and mobile developers with a set of easy-to-use and integrate REST APIs to manage their core backend needs.
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