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

Conduct Exam
Wooclap
ClassMarker
Questionmark
Edmentum Assessments
NWEA Assessments
Taskstream
Test Management Software being used in many countries in all languages. Useful for schools, teachers, professors, parents, companies, recruiting agencies. Student Answer Sheet facility
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 | exam-software.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...
No description of Exam Software 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
Educational institutions, corporate training departments, certification bodies, and any organization needing to conduct secure, scalable online assessments.
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When comparing ZIP Code API and Exam Software, 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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Conduct Exam is a robust online exam software which offers impeccable assessment solutions
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Free Zip Code API - Free Postal Code Validation | Zipcodestack
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Wooclap lets teachers and trainers engage students and employees alike with real-time polls and quizzes, making classes, training sessions, and presentations more interactive.
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The most affordable postal code API. 240+ countries, sub-5 ms responses. Simple, elegant, transparent.
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The ClassMarker online testing website, is a professional, easy to use, online quiz maker that marks your tests and quizzes for you. Create online quizzes free quiz maker. Web-based online testingWeb-based online testing service | Free quiz maker.
Compare ClassMarker to ZIP Code API or Exam Software: