emWin

SEGGER emWin is a proven embedded graphics library that brings rich, responsive user interfaces to microcontroller-based products. From industrial HMI panels and medical device displays to consumer electronics and building automation touchscreens, emWin provides the complete widget set, rendering engine, and input handling that embedded GUI development demands, all optimized for the memory and processing constraints of real-time embedded systems.

Widget Library and Features

Category	Widgets / Features
Input Controls	Button, checkbox, radio button, slider, spinbox, dropdown, listbox, knob
Display Widgets	Text, header, graph, gauge, progbar, image, QR code
Container Widgets	Window, frame, dialog, tab control, scroll container
Data Widgets	Listview, treeview, calendar, multiedit
Graphics Engine	Anti-aliased rendering, alpha blending, bitmap rotation, scaling
Font Support	TrueType (TTF), bitmap fonts, Unicode, bidirectional text
Animations	Motion effects, screen transitions, fade, slide, zoom
Touch / Input	Capacitive touch, resistive touch, pointer, keyboard, gestures
Color Depth	1 bpp monochrome through 32 bpp ARGB
Memory Modes	Direct draw, buffered, multi-buffered (flicker-free)

AppWizard Visual Designer

AppWizard, the visual UI design tool included with emWin, allows designers and developers to build interfaces through drag-and-drop composition rather than hand-coding every screen element. Widgets can be arranged, styled, and connected to application logic visually, dramatically reducing the time from concept to working prototype. Animations, anti-aliased font rendering, and alpha blending deliver a modern visual experience that matches user expectations set by smartphone interfaces.

emWin4Web: Web-Based UI

emWin4Web extends the embedded GUI to any web browser by integrating a VNC server that streams the emWin display output over the network. This enables remote monitoring and control of embedded devices through a standard browser without developing a separate web interface. The same emWin application code drives both the local display and the remote web view, eliminating the need to maintain two parallel UI implementations.

Multi-Language and Ecosystem

Watch the SEGGER emWin introduction

Multi-language support through Unicode and bidirectional text rendering ensures that products can ship globally without engineering rework for each locale. Royalty-free licensing eliminates per-unit costs, and the library’s small footprint makes it practical for deployment on Cortex-M class devices. Combined with SEGGER’s embOS for real-time task management and SystemView for performance profiling, emWin integrates into a cohesive SEGGER ecosystem where GUI rendering, RTOS scheduling, and debug visibility work together.