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
AppWrite
Vercel
Next.js
PocketBase.io
Hasura
Railway
An open source Firebase alternative

Which is more popular?
Based on our record, Supabase seems to be more popular. It has been mentioned 561 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 | supabase.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 Supabase yet.
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
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Basic demo
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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 Supabase. 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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Supabase combines PostgreSQL with authentication, storage, realtime functionality, and other backend services, making it a great fit for teams looking for an all-in-one platform. Teams with specialized PostgreSQL...
Supabase offers an open-source PostgreSQL backend that is tailored for developers with simplicity and scalability requirements. Its fully managed infrastructure aligned with integrated APIs makes it an excellent...
Supabase: An open-source BaaS alternative to Firebase, offering instant Postgres APIs, auth, edge functions, and growing AI-ready tooling. Ideal for modern dev teams but limited in orchestration and multi-agent flows.
Recommendations tracked on public social media and blogs since March 2021.

Tracking ZIP Code API since May 2026.
Free tier, permanent. Requires an API key, but the free quota resets every month or day and never expires on its own. Examples: Groq, Resend, Supabase, ROIC.ai. - Source: dev.to / 16 days ago
If you let Claude Code build an app on your backend and never mention security, where does it put the access rules? And does it get them right? I tried it by building two apps on Supabase, Appwrite and Nhost through their CLIs, with the... - Source: dev.to / 21 days ago
{ "name": "Supabase", "aliases": ["supabase"], "category": "database", "role": "backend and authentication", "mention": "used", "evidence": [ { "quote": "we use Supabase for auth and the database", "start": 761 } ], ... - Source: dev.to / 22 days ago
When comparing ZIP Code API and Supabase, 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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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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The most affordable postal code API. 240+ countries, sub-5 ms responses. Simple, elegant, transparent.
Compare PostalDataPI to ZIP Code API or Supabase:

Vercel is the platform for frontend developers, providing the speed and reliability innovators need to create at the moment of inspiration.
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