Software Alternatives, Accelerators & Startups

User CSS VS Bryntum

Compare User CSS VS Bryntum and see what are their differences

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User CSS logo User CSS

User CSS is a browser extension that allows you to inspect style sheets from websites.

Bryntum logo Bryntum

High performance web components for SaaS apps - including Gantt, Scheduler, Grid, Calendar and Kanban widgets. Seamless integration with React, Vue, Angular or plain JS apps.
  • User CSS Landing page
    Landing page //
    2023-08-06
  • Bryntum
    Image date //
    2024-12-28
  • Bryntum
    Image date //
    2024-12-28
  • Bryntum
    Image date //
    2024-12-28
  • Bryntum
    Image date //
    2024-12-28

Tired of building scheduling features from scratch? Bryntum’s high-performance components handle the heavy lifting - no more date-time nightmares. Our JavaScript widgets (Scheduler, Data Grid, Gantt, TaskBoard, Calendar) integrate seamlessly with React, Angular, or Vue. They process massive datasets, deliver fast rendering, and adapt to your style. With robust docs, flexible APIs, and dedicated support, Bryntum helps you build top-tier apps without the late-night debugging.

User CSS

Pricing URL
-
$ Details
-
Platforms
-
Release Date
-

Bryntum

$ Details
Free Trial $850.0 / One-off (OEM license for commercial use)
Platforms
React Angular Vue JavaScript TypeScript
Release Date
2009 September
Startup details
Country
Sweden
City
Stockholm
Founder(s)
Mats Bryntse
Employees
10 - 19

User CSS features and specs

  • Customization
    User CSS allows for extensive customization of the appearance of websites, enabling users to tailor styles to their preferences or needs.
  • Accessibility
    Custom styles can improve accessibility by enhancing contrast, increasing font sizes, or adjusting layouts to make content more readable for individuals with visual impairments.
  • Consistency
    It can create a consistent look and feel across different websites by applying a personalized style sheet, which is beneficial for users who value uniformity.
  • Ad Blocking
    User CSS can be used to hide unwanted elements like advertisements or pop-ups, creating a cleaner browsing experience.
  • Focus on Content
    Users can modify the display to focus on content they deem important by hiding or de-emphasizing less relevant elements.

Possible disadvantages of User CSS

  • Maintenance
    User CSS scripts need regular updates and maintenance, as changes to website structures, class names, or IDs can break the applied styles.
  • Compatibility Issues
    Custom styles may not render correctly across different devices or browsers, leading to inconsistencies in how content is viewed.
  • Complexity
    For non-technical users, creating and managing User CSS can be complex and daunting without knowledge of CSS.
  • Website Functionality
    Incorrect or overly aggressive styling can inadvertently break website functionality or usability by hiding functional elements such as navigation or interactive components.
  • Performance
    Applying User CSS can affect the loading performance of websites, especially if the styles are extensive or poorly optimized.

Bryntum features and specs

  • Drag-drop
    Drag drop and resize any task
  • RTL
    Right-to-Left support
  • Import & Export
    Export + Import from MS Project / Excel
  • WCAG 2.1
    Fully accessible
  • Travel time
    Visualize travel time for each task
  • Easy theming
    Roll your own theme or customize one of the built-in ones
  • Dark theme
    For working late
  • High performance
    Handles tens of thousands of tasks/rows
  • UX
    Excellent UX your users will love
  • AI Copilot
    In-product AI assistant letting you navigate and schedule using natural language

User CSS videos

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Bryntum videos

Boost your app UX with Bryntum

More videos:

  • Demo - Flight dispatch scheduling demo with Bryntum Scheduler Pro

Category Popularity

0-100% (relative to User CSS and Bryntum)
Development
100 100%
0% 0
Project Management
0 0%
100% 100
Developer Tools
100 100%
0% 0
Javascript UI Libraries
0 0%
100% 100

Questions and Answers

As answered by people managing User CSS and Bryntum.

How would you describe your primary audience?

Bryntum's answer:

Bryntum primarily targets professional software teams - particularly frontend developers, architects, UX, and technical leads who need robust scheduling and project-planning functionality for their web applications. Our products (such as the Scheduler and Gantt components) are designed for organizations that want to integrate sophisticated resource management, timeline visualization, and interactive scheduling into existing or new software solutions.

In practice, these teams often work in industries and use cases where precise scheduling is critical (e.g., project management, construction, healthcare, manufacturing, and IT services). While developers are the day-to-day implementers of Bryntum’s products, managers or product owners (such as PMO leads or development managers) also play a role in evaluating Bryntum’s solutions to ensure they meet the organization’s technical and business requirements.

What makes your product unique?

Bryntum's answer:

What Makes Bryntum Unique?

Bryntum stands out because of its laser focus on high-performance, enterprise-grade JavaScript components—particularly around scheduling and project planning. Here are a few reasons why Bryntum is unique:

  1. Advanced Scheduling Expertise
    Bryntum’s Scheduler and Gantt products are widely recognized for their sophisticated scheduling capabilities. Their tools handle complex resource allocations, dependencies, drag-and-drop reordering, and timeline visualizations—making them a go-to choice for project and resource management in large-scale applications.

  2. Pure JavaScript (Framework Agnostic)
    All Bryntum components are developed using modern, pure JavaScript. This means they can easily integrate into any tech stack or framework (React, Angular, Vue, etc.) without sacrificing functionality or performance. If you switch frameworks in the future, you can keep using Bryntum’s components with minimal refactoring.

  3. Performance & Scalability
    Bryntum components are designed for high-volume data rendering. Whether it’s thousands of tasks in a Gantt chart or a scheduler loaded with numerous resources, Bryntum’s products can handle heavy data loads smoothly and maintain snappy interactions.

  4. Robust Feature Set
    From critical-path analysis in Gantt charts to resource histograms and timeline overviews, Bryntum packs advanced features that meet enterprise project-planning requirements. This feature depth is one reason many organizations choose Bryntum over more general-purpose grid libraries.

  5. Extensive Documentation & Demos
    Bryntum provides thorough documentation, live examples, and demo apps that showcase how to integrate its components into a variety of environments. This makes it easier for developers to learn the product and quickly build prototypes.

  6. Dedicated Support & Development
    A hallmark of Bryntum is its attentive support. Their engineering and support teams are responsive and highly knowledgeable about both front-end development and project-planning logic, which speeds up troubleshooting and feature requests.

By focusing on scheduling and project-planning tools with high performance, great flexibility, and deep functionality, Bryntum has carved out a niche that sets it apart from other libraries and component vendors.

Why should a person choose your product over its competitors?

Bryntum's answer:

Performance, UX and abundance of features.

Which are the primary technologies used for building your product?

Bryntum's answer:

JavaScript, TypeScript and CSS

What's the story behind your product?

Bryntum's answer:

Bryntum was founded by Mats Bryntse, a software developer from Stockholm, Sweden, who had a deep interest in creating advanced scheduling solutions for web applications. Originally, Bryntum began as a consulting and component-development company centered around Sencha Ext JS, one of the leading JavaScript frameworks in the late 2000s.

Early Days (Ext Scheduler & Gantt)

Mats Bryntse developed the first version of Ext Scheduler, a scheduling component based on Ext JS, in response to a growing demand for an interactive resource-scheduling tool in web applications. Building on the success of Ext Scheduler, Bryntum introduced a Gantt component, allowing developers to visualize and manage project tasks, dependencies, and timelines directly in the browser. Transition to Pure JavaScript

Over time, the JavaScript ecosystem expanded to include many popular frameworks (React, Angular, Vue, etc.). Instead of maintaining separate builds for each, Bryntum decided to make its components framework agnostic, rebuilding them as pure JavaScript libraries. This shift allowed Bryntum’s tools to be integrated into virtually any front-end stack while delivering the same level of performance and scheduling sophistication.

Who are some of the biggest customers of your product?

Bryntum's answer:

  • Apple
  • Netflix
  • SpaceX
  • Intel
  • Disney
  • US Navy
  • Airbus
  • American Airlines
  • AstraZeneca
  • Coca-Cola

Over 5,000 customers in 80 countries: https://bryntum.com/company/customers/

User comments

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What are some alternatives?

When comparing User CSS and Bryntum, you can also consider the following products

CSS Peeper - Smart CSS viewer tailored for Designers.

Mobiscroll - UI controls for great web & mobile developers. Use it for progressive web and hybrid apps with plain JS, jQuery, Angular, React and KO.

CSSViewer - A simple CSS property viewer

FullCalendar - FullCalendar is an open-source JavaScript event calendar.

CSS Dig - CSS Dig is a Cascading Style Sheet viewer extension that allows you to collect and style the website element properties.

Schedule-X.dev - Modern JavaScript Event calendar for React, Angular, Vue and plain JS. Modern alternative to Fullcalendar. Drag & drop, dark mode, event resizing and more.