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

Kahoot!
Mentimeter
AhaSlides
Sli.do
Poll Everywhere
Blooket
Conduct Exam
Wooclap lets teachers and trainers engage students and employees alike with real-time polls and quizzes, making classes, training sessions, and presentations more interactive.
Which is more popular?
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 | wooclap.com |
| Pricing | — | |
| Company | Startup from the United States · 2026 | Startup from Belgium · 50 - 99 employees |
| 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...
Wooclap was born from a simple conviction: we learn and retain better when we actively participate, not when we passively listen. Whether in a classroom, a corporate training session, or a conference, real engagement is what turns information into understanding. This belief was shared by Jonathan...
What each product offers, as listed by its team.

Possible disadvantages
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
Recommended for
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WooClap has different question types that you can embed within your presentation. Even better, there’s no app to download, nothing to install; participants can use a link to connect to WooClap on their smartphone,...
When comparing ZIP Code API and Wooclap, 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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Kahoot! makes it easy to create, play and share fun learning games in minutes—for any subject, in any language, on any device.
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Free Zip Code API - Free Postal Code Validation | Zipcodestack
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a web-based polling tool for workshops, conferences & events
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The most affordable postal code API. 240+ countries, sub-5 ms responses. Simple, elegant, transparent.
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Add live polls, quizzes, word clouds and Q&As to make presentations interactive. See dynamic audience interactions happen in real-time.
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