Bootstrap
Tailwind CSS
Foundation
Materialize CSS
Bulma
Semantic UI
UIKit
React
PostalDataPI
Smarty
Melissa Data Quality
PostalDataPI is a global postal code validation and enrichment API covering 240+ countries and territories. One API, one key, one flat rate โ $0.000028 per query with no tiers or subscriptions.
What you get back: Up to 18 metadata fields per postal code โ city, state/region, coordinates, timezone, three levels of administrative hierarchy, elevation, and more. Sub-5ms cached responses.
Works everywhere: US ZIP codes, UK postcodes, German PLZ, Japanese postal codes, Canadian FSAs, and 230+ more. Format normalization handles case, spacing, and hyphen variations automatically.
Get started in 60 seconds: 1,000 free queries on signup, no credit card required. SDKs for Python and Node.js. MCP server for AI agents (Claude, Cursor, etc.).
Built for developers: REST API, consistent JSON responses across all countries, OpenAPI spec, llms.txt for AI agent discovery.
Bootstrap
PostalDataPIBased on our record, Bootstrap seems to be more popular. It has been mentiond 370 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Reminds me of what bootstrap [1] was like around a decade ago. It's gotten quite a bit bloated since then though. 1. https://getbootstrap.com/. - Source: Hacker News / 5 months ago
But there is a new library, built from the beginning for Signal Forms. Its name is @ng-forge/dynamic-forms. It comes with an integration of common UI libraries: Angular Material, Bootstrap, but also PrimeNG and Ionic. - Source: dev.to / 7 months ago
Bootstrap used to be - and may still be - the most popular CSS framework for fast, responsive web development. It includes a set of predefined CSS classes, components, and JS plugins that make it easier to build modern design, responsive layouts, forms, navigation, and other interactive elements. It goes further than the previously covered Tailwind CSS, which focuses solely on styling. - Source: dev.to / 6 months ago
Note: The version of Bootstrap may be different. At the time of publishing this blog, the latest version is 5.3.8. You can check for the latest version from the official Bootstrap website. - Source: dev.to / 7 months ago
Using package manager: For more integrated setups in modern web apps, you can install it via npm. Visit the Bootstrap official page for more details on this. - Source: dev.to / 9 months ago
Tailwind CSS - A utility-first CSS framework for rapidly building custom user interfaces.
Smarty - Smarty provides address validation, autocomplete, geocoding and reverse geocoding services covering addresses in over 240+ countries.
Foundation - The most advanced responsive front-end framework in the world
Melissa Data Quality - Melissa helps companies to harness Big Data, legacy data, and people data (names, addresses, phone numbers, and emails).
Materialize CSS - A modern responsive front-end framework based on Material Design
Bulma - Bulma is an open source CSS framework based on Flexbox and built with Sass. It's 100% responsive, fully modular, and available for free.