
Marker.io
BugHerd
Usersnap
Canny.io
Ruttl
Pastel
Markup.io
Userback empowers product teams to collect, understand, and act on user feedback with unprecedented speed and clarity.
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, Userback seems to be more popular. It has been mentioned 3 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 | userback.io | zip-codes.com |
| Pricing | — | |
| Platforms | — | |
| Company | Startup from Australia · 10 - 19 employees | Startup from the United States · 2026 |
| Listed in |
In their own words, as submitted to SaaSHub.

Userback is a powerful visual feedback and bug-tracking platform tailored for SaaS teams looking to enhance their product development process. With Userback, you can easily capture and manage user feedback through annotated screenshots, session replays, and customizable surveys. This ensures that...
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.

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
Walkthroughs and reviews on video.
Userback Explainer Video
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How often each product is chosen within a category, 0–100% relative to the other.

As answered by people managing Userback and ZIP Code API.
Userback's answer
Userback stands out due to its emphasis on visual feedback and seamless integration into existing workflows. Unlike traditional feedback tools, Userback allows users to capture annotated screenshots, session replays, and detailed user insights directly from your website or application. This level of visual detail makes it easier for teams to understand and address issues quickly. Additionally, Userback's integrations with popular project management tools like Jira, Trello, Asana, and Slack ensure that feedback is instantly actionable, keeping your development process efficient and user-focused.
Userback's answer
Userback offers a unique combination of visual feedback tools, customizable user surveys, intuitive user experience, and powerful integrations that set it apart from competitors. The platform's ability to capture detailed, visual feedback directly from users reduces the back-and-forth often associated with bug tracking and issue resolution. Moreover, Userback's customizable feedback forms and automated workflows make it easy to tailor the platform to your specific needs, whether you're a small team or a large organization. By choosing Userback, you ensure that your development process is driven by clear, actionable insights that lead to better products and happier users.
Userback's answer
Userback’s primary audience includes product managers, UX/UI designers, software developers, and customer support teams in SaaS companies and digital agencies. These professionals rely on Userback to streamline the feedback collection process, improve communication between teams, and deliver products that align with user expectations. Whether working on a new feature or refining an existing product, Userback helps these teams stay connected with their users and make data-driven decisions that enhance the overall user experience.
Userback's answer
Userback was born out of a desire to bridge the gap between users and product teams by making feedback collection more efficient and actionable. The founders recognized that traditional feedback tools often lacked the ability to convey the visual context needed to truly understand user issues. To solve this, they created a platform that combines visual feedback with powerful integrations, allowing teams to capture, manage, and act on feedback in real-time. Since its inception, Userback has grown into a trusted tool for thousands of teams worldwide, helping them build products that users love.
Share your experience with using Userback and ZIP Code API. For example, how are they different and which one is better?
Recommendations tracked on public social media and blogs since March 2021.

Userback is a game changer! It lets me collect feedback from my users in a snap and share it with my dev team so we can fix things faster. It's saved so many headaches from figuring out where to get started by having everything in one... Source: over 3 years ago
Userback is a good tool for design review & feedback. Source: about 4 years ago
The userback.io link appears to relate to the site's hovering "feedback" button on the side, which may be regarded by some as an annoyance, though I'd only block it if it doesn't otherwise remove the feedback function on the site. The... Source: about 4 years ago
Tracking ZIP Code API since May 2026.
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BugHerd: The Website Feedback Tool for Agencies
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Free Zip Code API - Free Postal Code Validation | Zipcodestack
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Usersnap is a customer feedback software for SaaS companies that need to constantly improve and grow their products.
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The most affordable postal code API. 240+ countries, sub-5 ms responses. Simple, elegant, transparent.
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