
Day One
Daylio
Rosebud App
Stoic.
Journey
Headspace
Penzu
The world's first intelligent journal
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

Which is more popular?
Based on our record, REFLECTLY 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 | reflectlyapp.com | zip-codes.com |
| Company | — | Startup from the United States · 2026 |
| Listed in |
In their own words, as submitted to SaaSHub.

No description of REFLECTLY 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...
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
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Walkthroughs and reviews on video.
Reflectly
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External articles and on-site reviews we used to compare the two products.

Reflectly describes itself as a journal for happiness. More specifically, it claims it will enable users to “deal with negative thoughts and make positivity louder” as it teaches them about the science of wellbeing....
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Recommendations tracked on public social media and blogs since March 2021.

[Reflection/Journalling] Reflectly (https://reflectly.app/) I’m a big fan of the user experience, but if you’re looking for a softer reflection app and want to store some journal data, here’s my recommendation, feel free to check out.... Source: over 5 years ago
The current state of the Flutter is quite significant in the market. There have been many successful examples of Flutter that highlight Flutter’s commitment to app development. A few of the many popular apps built using the Flutter... - Source: dev.to / over 5 years ago
Tracking ZIP Code API since May 2026.
When comparing REFLECTLY and ZIP Code API, you can also consider the following products.

A simple journal application for the Mac, iPhone, and iPad. AboutTo learn more about Day One, see these two excellent reviews . PublishPublish is not available in Day One 2.
Compare Day One to REFLECTLY or ZIP Code API:

Smarty provides address validation, autocomplete, geocoding and reverse geocoding services covering addresses in over 240+ countries.
Compare Smarty to REFLECTLY or ZIP Code API:

Daylio enables you to keep a private diary without having to type a single line.
Compare Daylio to REFLECTLY or ZIP Code API:

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

Rosebud's therapist-backed platform combines AI with interactive journaling, habit-building, and emotional support. See significant improvements in just 7 days.
Compare Rosebud App to REFLECTLY or ZIP Code API:

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