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

Canny.io
UserVoice
Upvoty
Frill
Fider
productboard
UseResponse
A fast & beautiful way to collect user feedback

Which is more popular?
Based on our record, Nolt.io seems to be more popular. It has been mentioned 8 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 | nolt.io |
| 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...
$25 / month
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
No analysis of Nolt.io yet.
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Give Your Community A Vote And A Voice With Nolt (Onboaring and Review)
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External articles and on-site reviews we used to compare the two products.

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Customer feedback doesn’t have to be boring. At least that’s how the leaders behind Nolt feel. As one of the top alternatives to Canny, this app offers a stunning, visual feedback board that users will love to use...
Small businesses prefer Nolt (opens in new tab) than Featurebase because it is more friendly to them and simpler to use. It is a lightweight feedback management software with basic features. Nolt has a very modern...
Nolt.io is a customer feedback tool that helps you collect and organize feedback from your customers. You can use this tool to create a single place where all of your customers' comments are collected and organized...
Recommendations tracked on public social media and blogs since March 2021.

Tracking ZIP Code API since May 2026.
I’ve seen others use nolt. https://nolt.io/. - Source: Hacker News / about 2 years ago
Seems like nolt.io and rust feedback is privated at the moment, must have had ppl bombing it after the update. Source: over 3 years ago
- Employee feedback board - a place where bigger companies can head their employees and their problems (https://nolt.io/ for employees and companies). Source: over 4 years ago
When comparing ZIP Code API and Nolt.io, 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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Canny helps you collect and organize feature requests to better understand customer needs and prioritize your roadmap.
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Free Zip Code API - Free Postal Code Validation | Zipcodestack
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UserVoice integrates easy-to-use feedback, helpdesk, and knowledge base management tools in one platform that empowers users to speak and companies to understand.
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The most affordable postal code API. 240+ countries, sub-5 ms responses. Simple, elegant, transparent.
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