lvgl
A free, portable embedded graphics library for creating beautiful UIs on any MCU, MPU, and display type.
What is lvgl?
LVGL is an open-source embedded graphics library written in C that allows developers to create graphical user interfaces for microcontrollers and microprocessors. It solves the problem of building modern, visually appealing UIs on resource-constrained embedded devices with limited memory and processing power. The library provides a comprehensive set of widgets, styling options, and layout systems while maintaining minimal hardware requirements.
Embedded systems engineers and firmware developers working on devices with displays, such as smartwatches, IoT dashboards, industrial HMIs, and medical devices. It's particularly valuable for teams needing to create custom UIs on MCUs/MPUs without relying on heavyweight operating systems.
Developers choose LVGL for its exceptional portability (no external dependencies), minimal resource requirements, and comprehensive feature set that rivals desktop UI frameworks. Its MIT license allows commercial use without restrictions, and the active community provides extensive documentation and examples.
Overview
Embedded graphics library to create beautiful UIs for any MCU, MPU and display type.
Use Cases
Best For
- Building UIs for smartwatches and wearable devices
- Creating touchscreen interfaces for IoT dashboards and control panels
- Developing HMIs for industrial equipment and medical devices
- Implementing graphical displays on resource-constrained MCUs
- Prototyping embedded UIs quickly with the LVGL Pro editor
- Adding modern UI elements to existing embedded systems
Not Ideal For
- Projects targeting desktop or mobile platforms with native SDKs like Qt or Flutter
- Teams wanting a drag-and-drop UI builder without any C programming or manual driver setup
- Applications requiring high-frame-rate 3D gaming graphics or complex visual effects on GPUs
- Developers already using JavaScript-based embedded frameworks like Espruino for rapid prototyping
Pros & Cons
Pros
With no external dependencies and minimal requirements (~32kB RAM, ~128kB Flash), LVGL compiles for any MCU or MPU, making it universally adaptable for embedded systems.
Includes 30+ built-in widgets like charts, keyboards, and meters, enabling complex UIs without custom development from scratch.
Offers ~100 style properties with animations, shadows, and anti-aliasing, allowing deep customization of widgets in any state.
Features Flexbox and Grid-like systems for responsive design, crucial for varying screen sizes in embedded devices.
Cons
Requires writing custom display flush and input read callbacks, which can be complex and error-prone for developers new to embedded graphics.
Advanced features like the XML editor and Figma integration are part of LVGL Pro, a separate toolkit that may add cost or learning overhead.
Primarily designed for C with no built-in support for other languages, which might deter teams preferring Python or JavaScript for faster iteration.
Frequently Asked Questions
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