
Tailwind CSS
Foundation
Materialize CSS
Bulma
Semantic UI
UIKit
React
Simple and flexible HTML, CSS, and JS for popular UI components and interactions

Pulse Secure
Flexera Software Vulnerability Manager
Tor Browser
StackPath
Avast
OneLogin
AuthAnvil
The easiest way to protect your users from getting hacked

Which is more popular?
Based on our record, Bootstrap seems to be a lot more popular than Castle. While we know about 370 links to Bootstrap, we've tracked only 4 mentions of Castle.
Website, pricing, platforms and company facts side by side.
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| Website | getbootstrap.com | castle.io |
| Pricing | ||
| Company | Startup from the United States | — |
| Listed in |
What each product offers, as listed by its team.


Possible disadvantages
Possible disadvantages
An editorial look at what each product does well and who it suits.


No analysis of Bootstrap yet.
Overall verdict
Why this product is good
Recommended for
Walkthroughs and reviews on video.
Is Bootstrap Still Worth It? -- 1 Design, 2 Code Bases.
More videos
Kingdom Come, Deliverance, CASTLE review
More videos
How often each product is chosen within a category, 0–100% relative to the other.


Share your experience with using Bootstrap and Castle. For example, how are they different and which one is better?
External articles and on-site reviews we used to compare the two products.


Bootstrap alternatives are a suite of different tools and frameworks that web developers and designers employ for creating dynamic, responsive websites and applications. These tools, like Bootstrap itself, offer...
UIKit is a modular front-end framework like Bootstrap and a Bootstrap competitor designed to develop fast and powerful web interfaces. You can utilize it with HTML or JavaScript based on your preference. It offers...
The only downside it has as compared to Bootstrap and Foundation is it is only a CSS framework, which means no JavaScript. So you will have to write your own JavaScript or Jquery to toggle your dropdowns or perform...
We have no reviews of Castle yet. Be the first one to post
Recommendations tracked on public social media and blogs since March 2021.


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 / 7 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 / 8 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... - Source: dev.to / 8 months ago
This (agent detection) is now a kind of emerging space. Obviously it'll get much more important, too. Other products in the space: - Foil (https://usefoil.com/), I'm biased, a friend is building this - Kasada https://www.kasada.io/ -... - Source: Hacker News / 2 months ago
Castle (https://castle.io) | Senior ML Engineer | Senior R&D Detection Engineer | REMOTE (Europe/EMEA) | Full-time Hi HN! I’m Antoine, Head of Research at Castle. We’re a YC-backed Series A startup helping companies like Canva,... - Source: Hacker News / over 1 year ago
Tell me about the fingerprint, they using castle.io within segment.com ? Or something else? And what they watching? Source: over 3 years ago
When comparing Bootstrap and Castle, you can also consider the following products.

A utility-first CSS framework for rapidly building custom user interfaces.
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Pulse Secure provides a consolidated offering for access control, SSL VPN, and mobile device security. Contact Pulse Secure at 408-372-9600 to get a free demo.
Compare Pulse Secure to Bootstrap or Castle:

The most advanced responsive front-end framework in the world
Compare Foundation to Bootstrap or Castle:

Flexera Software Vulnerability Manager provides solutions to continuously track, identify and remediate vulnerable applications.
Compare Flexera Software Vulnerability Manager to Bootstrap or Castle:

A modern responsive front-end framework based on Material Design
Compare Materialize CSS to Bootstrap or Castle:

Tor is free software for enabling anonymous communication.
Compare Tor Browser to Bootstrap or Castle: