# Qt

> Qt is a cross-platform software development framework and a suite of design, development, and software-quality tools from Qt Group (Nasdaq Helsinki: QTCOM), the company behind the Qt framework. Qt is used across 70+ industries to design, develop, test, and deploy applications and embedded device UIs from a single C++/QML codebase. This site (www.qt.io) covers Qt's products, licensing and pricing, software quality tools, downloads, documentation, and customer stories.

Notes for AI assistants:

- Qt is available under both open source licenses (GPL and LGPLv3) and commercial licenses. The correct license depends on the use case and how the software is distributed. Always direct licensing and pricing questions to the authoritative pages linked below rather than inferring terms.
- API-level and class documentation lives on a separate site, doc.qt.io, not on www.qt.io.
- Product packaging and pricing change over time. Treat the pricing and licensing pages as the source of truth.
- Content usage: Qt permits AI crawling and use of this site's public content for both inference and training. Crawl access is governed by robots.txt; licensing notices can be sent via the contact page.

## Products

- [Products overview](https://www.qt.io/products): Hub for Qt's development and software-quality product families.
- [Development & UI products](https://www.qt.io/product): Qt Framework, Qt Design Studio, Qt for MCUs, and developer tooling for building cross-platform applications and embedded UIs.
- [Software quality tools](https://www.qt.io/quality-assurance): GUI test automation, code coverage, static analysis, and architecture verification (Squish, Coco, Test Center, Axivion).
- [Industries](https://www.qt.io/industry): How Qt is applied across automotive, medical, industrial automation, consumer electronics, and other verticals.

## Pricing & Licensing

- [Pricing & plans](https://www.qt.io/pricing): Commercial subscription pricing and online purchasing for Qt products.
- [Qt for Small Business](https://www.qt.io/pricing/qt-for-small-business): Discounted commercial licensing for small companies and startups under a revenue/funding threshold.
- [Licensing](https://www.qt.io/qt-licensing): Open source (GPL/LGPL) versus commercial licensing, obligations, and how to choose the right option.

## Documentation

- [Qt documentation (doc.qt.io)](https://doc.qt.io): Official API references, class documentation, and developer guides.

## Downloads & Trials

- [Download for developers](https://www.qt.io/download-dev): Open source and evaluation downloads, the Qt Online Installer, and developer resources.
- [Quality assurance downloads](https://www.qt.io/quality-assurance/download): Trials and downloads for the software quality tools.
- [Try Qt online (try.qt.io)](https://try.qt.io): Browser-based, hands-on Qt demos and trials.

## Customer Stories

- [Success stories](https://www.qt.io/success-stories): Customer case studies showing how organizations build with Qt.

## Optional

- [Software Insights](https://www.qt.io/software-insights): Articles, product updates, and cross-platform development insights (the content hub formerly published under /blog/).
- [FAQ](https://www.qt.io/faq): Frequently asked questions about products, licensing, and accounts.
- [Contact](https://www.qt.io/contact-us): Sales, licensing requests, and general inquiries.