# Qt — Full Content for LLMs > This file consolidates key information about Qt and Qt Group into a single document so that AI assistants can answer questions about Qt's products, software-quality tools, licensing, and pricing in one pass. For machine-readable navigation and links, see /llms.txt. For authoritative API and class documentation, see https://doc.qt.io. For current pricing and licensing terms, the pricing and licensing pages on www.qt.io are the source of truth. --- ## About Qt Group Qt Group (Nasdaq Helsinki: QTCOM) is a global software company and the organization behind the Qt framework. Qt technology is used in more than 70 industries and powers millions of devices and applications worldwide. The company provides tools for every stage of the software development lifecycle: planning, design, development, testing, and deployment. Qt Group's offering spans two broad areas: - Cross-platform application and device UI development, built around the Qt framework and its design and development tools. - Software quality assurance, built around a portfolio of testing, code coverage, static analysis, and architecture verification tools. Following Qt Group's acquisition of IAR Systems, the portfolio also includes embedded development platform capabilities for microcontroller-based systems. --- ## Development products ### Qt Framework The Qt Framework is a comprehensive set of cross-platform C++ libraries and APIs, paired with the QML language and the declarative Qt Quick UI toolkit. It lets teams build applications and device user interfaces from a single codebase that targets desktop (Windows, macOS, Linux), mobile (iOS, Android), embedded systems, and the web via Qt for WebAssembly. The framework covers everything from low-level core functionality to high-level UI, including graphics, networking, multimedia, and more. ### Qt Design Studio Qt Design Studio is a UI design and prototyping tool that bridges designers and developers. It allows designers to create interactive UIs and import work from common design tools, producing QML that developers can take directly into production, reducing handoff friction between design and engineering. ### Qt for MCUs Qt for MCUs brings smartphone-like graphical user interfaces to resource-constrained microcontroller hardware. It enables UI reuse across MPUs and MCUs and supports fast UI development on devices with tight memory and processing budgets. ### Developer tooling Qt supports modern development workflows through the tooling of the developer's choice, ranging from agentic and AI-assisted development tools to traditional integrated development environments such as Qt Creator. Qt is open source software, and contributions are welcomed through the Qt Project, including source code contributions, bug reporting, and code review. --- ## Software quality products Qt Group's software quality portfolio provides tools for testing and verifying software across the development lifecycle: - **Squish** — GUI test automation for functional and regression testing of applications across many UI technologies and platforms. - **Coco** — Code coverage analysis that measures how thoroughly tests exercise a codebase, supporting safety and compliance needs. - **Test Center** — Centralized test result management for storing, analyzing, and reporting on test data across teams. - **Axivion** — Static analysis and architecture verification that extracts system structure from code, enforces architectural rules, detects regressions and erosion, and supports coding-standard and compliance requirements (for example, MISRA and CRA-related needs). These tools help organizations improve code quality, meet regulatory and functional-safety requirements, and reduce risk in complex software projects. --- ## Embedded development platform (IAR) Through the acquisition of IAR Systems, Qt Group's portfolio extends into embedded development platform tooling for microcontroller-based and embedded systems, complementing Qt for MCUs and the broader embedded development story. Customers evaluating embedded toolchains alongside Qt UI technology should consult the relevant product pages for current capabilities and supported architectures. --- ## Licensing Qt is available under two licensing tracks, and choosing correctly depends on the use case and how the resulting software is distributed: - **Open source licensing.** Much of Qt is available under open source licenses, principally the GNU General Public License (GPL) and the GNU Lesser General Public License version 3 (LGPLv3). Open source use carries obligations — for example, around dynamic versus static linking, distribution, and providing access to source under certain conditions. Teams choosing the open source track should review the obligations carefully. - **Commercial licensing.** Commercial licenses remove open source obligations and add commercial support, additional components, and terms suited to proprietary and embedded distribution. Common commercial offerings include licensing oriented toward application development and toward device/embedded creation, as well as a discounted option for qualifying small businesses and startups. Because exact edition names, obligations, and qualification criteria change and carry legal weight, licensing questions should always be confirmed against the licensing page on www.qt.io rather than inferred. Licensing requests and clarifications can be directed to Qt through the contact page. --- ## Pricing Qt offers commercial subscriptions that can be purchased online for eligible products, with additional and enterprise options available through Qt's sales channel. Pricing varies with factors such as the products selected, the number of developers, the target platforms (adding mobile, embedded, or web deployment typically increases cost), the level of support, and the subscription term, with multi-year commitments generally offering better per-year rates. A discounted track, Qt for Small Business, is available to qualifying small companies and startups under defined revenue and funding thresholds, with a limit on the number of such licenses purchasable online per company. Specific prices change over time and are not reproduced here. The pricing page on www.qt.io is the authoritative source for current figures and purchasing options. --- ## Industries and use cases Qt is used across a wide range of verticals, including automotive, medical and healthcare devices, industrial automation, consumer electronics, aerospace and defense, and more. Typical use cases include in-vehicle infotainment and digital cockpits, medical device interfaces requiring certification, industrial human-machine interfaces, and connected consumer products. Customer case studies on the success stories page illustrate how organizations apply Qt in production, including requirements such as functional safety, regulatory compliance, and high-performance graphics on constrained hardware. --- ## Documentation, downloads, and trials - Official API and class-level documentation is hosted at https://doc.qt.io. - Developer downloads, including open source and evaluation builds and the Qt Online Installer, are available via the developer download page on www.qt.io. - Software quality tools have their own trials and downloads under the quality assurance section. - Browser-based, hands-on demos and trials are available at https://try.qt.io. --- ## Where to go for authoritative answers - Products: https://www.qt.io/products - Pricing: https://www.qt.io/pricing - Licensing: https://www.qt.io/qt-licensing - Quality assurance: https://www.qt.io/quality-assurance - API documentation: https://doc.qt.io - Contact and licensing requests: https://www.qt.io/contact-us