A2UI vs. Felgo Comparison


A2UI	Felgo FELGO GmbH	+	+
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About A2UI is a declarative UI protocol designed to enable AI agents to generate rich, interactive user interfaces that render natively across web, mobile, and desktop environments without executing arbitrary code. Instead of relying on text-only interactions or unsafe approaches like sending HTML or JavaScript, A2UI allows agents to communicate UI intent through structured JSON messages that describe components, layouts, and data bindings, which client applications then render using their own trusted, pre-approved components. This approach separates UI generation from UI execution, ensuring that interfaces are secure, consistent with the host application’s design system, and adaptable across platforms. It is designed to be LLM-friendly, using a flat, streaming JSON structure that allows agents to incrementally build and update interfaces in real time, enabling progressive rendering and responsive user experiences.	About Felgo is a cross-platform SDK for rapid, native app & game development for iOS, Android, Desktop & Embedded. Felgo’s biggest advantage is the big time savings and the easiness to learn compared to other development SDKs. You write less source code and make use of a single code base for all platforms. Less code means fewer bugs and faster releases of new updates from a single team for all platforms. Key Features for Mobile & Desktop: • Create stunning UIs and animations to wow your users and rank higher in the app stores. • Code & time savings up to 80% thanks to the reactive & declarative language and 200+ APIs. Key Features for Embedded: • Create high performance embedded system apps & second screen apps. • Native performance and rapid UI creation, powered by C++ & JavaScript. Felgo is an official Qt Technology Partner. Felgo is in use by over 50.000 developers worldwide and field-proven by Fortune 500 companies across all kinds of industries.
Platforms Supported Windows Not Supported Mac Not Supported Linux Not Supported Cloud Supported On-Premises Not Supported iPhone Not Supported iPad Not Supported Android Not Supported Chromebook Not Supported	Platforms Supported Windows Supported Mac Supported Linux Supported Cloud Not Supported On-Premises Not Supported iPhone Supported iPad Supported Android Supported Chromebook Not Supported
Audience AI developers and product teams who want to build agent-driven applications where models generate secure, dynamic user interfaces instead of just text responses	Audience Oraganizations looking for a cross-platform SDK for rapid, native app development.
Support Phone Support Not Supported 24/7 Live Support Not Supported Online Supported	Support Phone Support Supported 24/7 Live Support Supported Online Supported
API Offers API Not Supported	API Offers API Not Supported
Screenshots and Videos View more images or videos	Screenshots and Videos View more images or videos
Pricing Free Free Version Supported Free Trial Not Supported	Pricing Free for personal usage. https://felgo.com/pricing Free Version Supported Free Trial Supported
Reviews/Ratings Overall 0.0 / 5 ease 0.0 / 5 features 0.0 / 5 design 0.0 / 5 support 0.0 / 5 This software hasn't been reviewed yet. Be the first to provide a review: Review this Software	Reviews/Ratings Overall 5.0 / 5 ease 5.0 / 5 features 5.0 / 5 design 4.0 / 5 support 5.0 / 5 Read all reviews
	Pros & Cons from Real Users Pros Powerful enough with C++ and Python for complex cases, Very easy and productive to code with QML/Javascript for standard functionalities to implement, Rich and useful librairies of components, Quick and good support, Very useful cloud builds, Powerful and mature IDE, Useful plugins, Very useful live client with hot reload, etc. Cons No dark mode for the documentation, No support for VR (for now).
Training Documentation Supported Webinars Not Supported Live Online Not Supported In Person Not Supported	Training Documentation Supported Webinars Supported Live Online Supported In Person Supported
Company Information A2UI United States a2ui.org	Company Information FELGO GmbH Founded: 2012 Austria felgo.com
Alternatives AG-UI	Alternatives Codename One
assistant-ui	Svelte Native
CopilotKit	Titanium SDK
QML Qt	DoubleCheck Code Analysis Green Hills Software
Firecrawl View All	GraalVM View All
Categories Agentic AI Supported	Categories Application Development Supported
	Show More Features Application Development Features Access Controls/Permissions Supported Code Assistance Supported Code Refactoring Supported Collaboration Tools Supported Compatibility Testing Supported Data Modeling Supported Debugging Supported Deployment Management Supported Graphical User Interface Supported Mobile Development Supported No-Code Supported Reporting/Analytics Supported Software Development Supported Source Control Supported Testing Management Supported Version Control Supported Web App Development Not Supported
Integrations HTML Supported JSON Supported JavaScript Supported OpenUI Supported View All 4 Integrations	Integrations HTML Not Supported JSON Not Supported JavaScript Not Supported OpenUI Not Supported
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