
Foundation
Bootstrap
Materialize CSS
Semantic UI
UIKit
Tailwind CSS
Bulma
Material UI
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.
Foundation
PostalDataPIBased on our record, Foundation seems to be more popular. It has been mentiond 22 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.
Foundation - The most advanced responsive front-end framework. - Source: dev.to / 6 months ago
Foundation is a mobile-first responsive front-end framework that provides a range of CSS and JavaScript components for creating websites quickly. Itโs often seen as a competitor to Bootstrap, offering more flexibility and customization options. - Source: dev.to / almost 2 years ago
Foundation: An easy-to-use, powerful, and flexible front-end framework for building web applications on any device. - Source: dev.to / almost 2 years ago
Here is a thought you might want to consider and see if it makes sense. This is personal, but I also believe this is where design codes (especially CSS) are going to go. It is not going to be Tailwind or more new frameworks. Honestly, I think all of these Bootstrap, Foundation, and Tailwind, etc. Are like middle-layer abstractions are for designs that are neither small nor large. Bootstrap won because of the... - Source: Hacker News / almost 2 years ago
Foundation is another popular open-source front-end framework, similar to Bootstrap, but with its own set of features and design principles. It was created by ZURB a design and development company in 2011. And is also maintained by a community of developers. - Source: dev.to / over 2 years ago
Bootstrap - Simple and flexible HTML, CSS, and JS for popular UI components and interactions
Smarty - Smarty provides address validation, autocomplete, geocoding and reverse geocoding services covering addresses in over 240+ countries.
Materialize CSS - A modern responsive front-end framework based on Material Design
Melissa Data Quality - Melissa helps companies to harness Big Data, legacy data, and people data (names, addresses, phone numbers, and emails).
Semantic UI - A UI Component library implemented using a set of specifications designed around natural language
UIKit - A lightweight and modular front-end framework for developing fast and powerful web interfaces