DHTMLX is a collection of JavaScript UI components for building complex, data-intensive web applications. Its four core components - Gantt, Scheduler, Grid, and Diagram - are designed for enterprise use cases where out-of-the-box solutions fall short: large datasets, deep customization requirements, and production environments that demand reliable long-term support.
With over 20 years of active development, a dedicated engineering team, and thousands of enterprise deployments across the USA, EU, and beyond, DHTMLX stands as one of the most battle-tested JavaScript UI libraries available today. It is used by development teams across industries, including healthcare, manufacturing, logistics, finance, and government.
DHTMLX Gantt is built for advanced project and portfolio management in complex environments. It supports hierarchical task structures, multiple dependency types, constraints, and automatic scheduling, enabling accurate planning across large projects. Built-in features such as critical path calculation, baseline tracking, resource management, workload visualization, and progress tracking help teams monitor execution and identify bottlenecks. With support for large datasets, zoomable timelines, split tasks, milestones, and customizable scales, Gantt is well-suited for industries such as construction, manufacturing, and IT project delivery. Its extensible API allows deep customization of task behavior, rendering, and integrations with backend systems.
DHTMLX Scheduler provides a flexible and highly interactive solution for calendar and resource scheduling scenarios. It includes multiple view modes such as day, week, month, timeline, and units views, allowing developers to tailor scheduling interfaces to specific use cases. Features like recurring events, drag-and-drop editing, multi-resource assignment, and dynamic loading make it ideal for booking systems, field service management, healthcare scheduling, and workforce planning. Scheduler also supports timezone handling, custom event templates, and real-time updates, ensuring smooth operation in distributed and high-load environments.
DHTMLX Grid is a high-performance data grid engineered to handle large volumes of structured data with speed and efficiency. It uses smart rendering and virtualization to ensure fast loading and smooth scrolling, even with hundreds of thousands of rows. The Grid supports advanced features such as sorting, filtering, grouping, inline editing, column reordering, resizing, and freezing, as well as custom cell templates and editors. It also includes data export (Excel, CSV), clipboard operations, and integration with server-side data processing, making it a strong foundation for enterprise dashboards, admin panels, and analytical tools.
DHTMLX Diagram enables rich visual modeling and diagramming capabilities within web applications. It supports building flowcharts, organizational charts, decision trees, and BPMN-like process diagrams with a flexible system of shapes, connectors, and layouts. Developers can define custom shapes, control routing logic, and implement interactive editing features such as drag-and-drop, alignment, and grouping. The Diagram component integrates seamlessly with application data, serving as a visual layer for workflows, system architecture, and business process modeling.
Together, these components can be combined into fully integrated solutions, e.g., using Gantt for long-term planning, Scheduler for operational resource allocation, Grid for managing large datasets, and Diagram for visualizing workflows, all within a consistent UI and API framework.
Beyond these core tools, DHTMLX includes a broader ecosystem of components, including the Suite library with 20+ UI widgets (forms, layouts, charts), Kanban, To Do List, Spreadsheet, Pivot, Vault file upload tool, and Rich Text editor. This allows teams to build complete, end-to-end applications using a single, cohesive technology stack.
DHTMLX is built on a stable JavaScript foundation (vanilla JS with optional React, Angular, Vue, and Svelte integrations) and is backend-agnostic, working seamlessly with REST APIs and JSON. Designed for scalability and long-term use, it offers extensive customization, detailed documentation, and responsive technical support, making it a reliable choice for mission-critical enterprise applications.
Key Features
- Advanced Gantt chart with dependencies, critical path, auto-scheduling, and resource management.
- Interactive Scheduler with multiple calendar views, recurring events, and drag-and-drop editing.
- High-performance Grid with virtualization, large dataset handling, and advanced data operations.
- Diagram component for workflows, org charts, and BPMN-like visual modeling.
- Scalable architecture optimized for complex timelines and high data volumes.
- Extensive customization via API, templates, and configuration options.
- Seamless integration with modern frameworks and REST/JSON backends.
- Extended ecosystem with UI widgets, Kanban, Spreadsheet, Pivot, and more.
- Built-in export, data processing, and real-time interaction capabilities.
- Comprehensive documentation and responsive enterprise-level support.
Key Use Cases
DHTMLX is the right choice for development teams building:
- Project portfolio management and PMO tools with multi-project Gantt views and resource leveling.
- Enterprise resource planning (ERP) modules for scheduling production, logistics, and workforce.
- Healthcare scheduling platforms for patient appointments, OR management, and staff rostering.
- Construction and engineering project tracking with baseline, critical path, and progress analytics.
- SaaS platforms for team collaboration, sprint planning, and delivery tracking.
- Back-office data management applications requiring high-density, editable data grids.
- Business process management (BPM) tools with visual workflow editors.
- IT operations dashboards with network diagrams, infrastructure maps, and live event grids.
- HR platforms for org chart visualization and shift planning.
- Custom CRM and ERP interfaces requiring complex, interactive UI components.
Average Rating: 4.7/5.0
Total Reviews: 47
How Do G2 Users Rate DHTMLX UI?
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Has the product been a good partner in doing business?: 9.9/10 (Category avg: 8.5/10)
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Language Contingency: 9.4/10 (Category avg: 8.2/10)
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Component Library: 9.4/10 (Category avg: 8.9/10)
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Unlocked Components: 9.0/10 (Category avg: 8.6/10)
Who Is the Company Behind DHTMLX UI?
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Seller: DHTMLX
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Year Founded: 2005
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HQ Location: Warsaw, PL
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LinkedIn® Page: www.linkedin.com
9 employees on LinkedIn®
Who Uses This Product?
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Who Uses This: CEO
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Top Industries: Computer Software, Information Technology and Services
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Company Size: 79% Small, 19% Medium
What Do G2 Reviewers Say About DHTMLX UI?
AI-generated summary from verified user reviews
Pros
- Users value the comprehensive and flexible components of DHTMLX, enhancing their project management tools effectively and efficiently.
- Users praise the responsive and helpful customer support from DHTMLX, enhancing their overall experience with the product.
- Users highlight the clarity and thoroughness of the documentation, easing integration and enhancing their experience with DHTMLX UI.
- Users praise the ease of use of DHTMLX UI, noting its flexibility and excellent user experience.
- Users appreciate the easy integrations of DHTMLX UI widgets, enabling quick setup and seamless functionality in their software.
Cons
- Users find the complex licensing issues of DHTMLX UI challenging, often requiring additional support to navigate them.
- Users find the understanding difficulty due to complex licensing components, often needing assistance to progress.
What Are G2 Users Discussing About DHTMLX UI?
