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

Duolingo
Busuu
Memrise
Rosetta Stone
Lingvist
Mondly
HelloTalk
Babbel is a paid language learning service that aims to strike a balance between thoroughness and cost efficiency.
Which is more popular?
Based on our record, Babbel seems to be more popular. It has been mentioned 11 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 | babbel.com |
| Pricing | — | |
| Company | Startup from the United States · 2026 | Startup from Germany · 500 - 999 employees · 2007 |
| 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 Babbel yet.
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Babbel | The ULTIMATE Review
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You can determine your starting point as Babbel offers courses at all levels for users looking to learn a foreign language.
Part of learning in the programme is pronouncing the words you learn. Rosetta Stone was an early developer of speech recognition software, which gives learners feedback on their pronunciation. For more details about...
Duolingo, Memrise, LingoDeer, Busuu, and Babbel are popular choices. Duolingo makes learning fun with games. Babbel designs its interface for each language.
Recommendations tracked on public social media and blogs since March 2021.

Tracking ZIP Code API since May 2026.
Anyone as experience with feedback on https://www.rocketlanguages.com/ and https://babbel.com/ ? I’m mostly interested in speaking out loud skills, and those two have voice recognition it seems. - Source: Hacker News / over 1 year ago
It’s by know means comprehensive, as I try stuff all the time but these 5 are the consistent ones. 1. Duolingo– This free language-learning platform has become incredibly popular in recent years. It offers interactive lessons, quizzes,... Source: almost 4 years ago
I study with babbel.com and listen to Olly Richards on audible for 30 minutes every night. Source: over 4 years ago
When comparing ZIP Code API and Babbel, 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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Duolingo is a free language learning app for iOS, Windows and Android devices. The app makes learning a new language fun by breaking learning into small lessons where you can earn points and move up through the levels. Read more about Duolingo.
Compare Duolingo to ZIP Code API or Babbel:

Free Zip Code API - Free Postal Code Validation | Zipcodestack
Compare Zipcodestack to ZIP Code API or Babbel:

Join the global language learning community, take language courses to practice reading, writing, listening and speaking and learn a new language. Learn English with busuu's .
Compare Busuu to ZIP Code API or Babbel:

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

Learn a new language with games, humorous chatbots and over 30,000 native speaker videos.
Compare Memrise to ZIP Code API or Babbel: