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Kalliope is a modular always-on voice controlled personal assistant designed for home automation.
Smarty
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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

Which is more popular?
Based on our record, kalliope seems to be more popular. It has been mentioned 2 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 | github.com | zip-codes.com |
| Company | — | Startup from the United States · 2026 |
| Listed in |
In their own words, as submitted to SaaSHub.

No description of kalliope yet.
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...
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Gryphon Diablo 300, Gryphon Kalliope Aria, B&W 800 D3, Schnerzinger
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Recommendations tracked on public social media and blogs since March 2021.

I have found this package called Kalliope which is a personal assistant framework. I tried pip3 install kalliope, but I get an error on installing pyalsaaudio:. Source: almost 4 years ago
I would start looking at the Voice assistance projects For example Mycroft, Kalliope or Almond (But I think it is dead). Source: about 4 years ago
Tracking ZIP Code API since May 2026.
When comparing kalliope and ZIP Code API, you can also consider the following products.

Mycroft is the world’s first open source assistant.
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Smarty provides address validation, autocomplete, geocoding and reverse geocoding services covering addresses in over 240+ countries.
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Siri is an intelligent assistant that offers a faster, easier way to get things done on your Apple devices. Even before you ask.
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Free Zip Code API - Free Postal Code Validation | Zipcodestack
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The most affordable postal code API. 240+ countries, sub-5 ms responses. Simple, elegant, transparent.
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