Uncovering the Best ForeUI Alternatives for UI Prototyping
EaSynth ForeUI is a well-regarded UI prototyping tool, known for its ability to create skinnable and interactive software or website prototypes that can be simulated in a web browser. While ForeUI offers valuable features for UI design, many designers and developers seek out alternatives for various reasons, including cost, platform compatibility, specific feature sets, or collaboration needs. This article explores the top ForeUI alternatives available today, helping you find the perfect tool for your next project.
Top ForeUI Alternatives
Whether you're looking for free, open-source, or premium options with advanced features, this list covers a diverse range of UI prototyping and wireframing tools that can serve as excellent replacements for ForeUI.

Pencil Project
Pencil Project is an excellent free and open-source ForeUI alternative, available as a standalone application or a Firefox extension. It's a versatile tool for creating diagrams or UI mockups, supporting multiple platforms including Mac, Windows, Linux, PortableApps.com, and Electron/Atom Shell. While it lacks built-in collaboration features, its strength lies in its drawing, sketching, wireframing, and prototyping capabilities, making it a great choice for individual designers.

Lucidchart
Lucidchart is a powerful online diagram and flowchart software that stands out as a strong ForeUI alternative, especially for teams. Available as a freemium web-based tool with Android, iPhone, and Chrome OS apps, it offers robust real-time collaboration features. Its capabilities extend to charts, flowcharts, general-purpose diagramming, UI design, and prototyping, with useful features like Microsoft Visio import, export to PDF, and integration with Google Drive and Microsoft Office Suite.

Balsamiq Wireframes
Balsamiq Wireframes is a popular commercial ForeUI alternative focused on rapid, low-fidelity UI wireframing. It simulates the experience of sketching on a notepad or whiteboard, making it ideal for quick ideation. Available on Mac, Windows, and Web, it offers strong drawing and real-time collaboration features, perfect for capturing initial design concepts swiftly.

Marvel
Marvel is a comprehensive collaborative design platform, making it an excellent freemium ForeUI alternative for those needing an all-in-one solution. It allows users to wireframe, prototype, and design online, and even create design specs in one place. With apps for Android, iPhone, Android Tablet, iPad, and Apple Watch, it offers robust prototyping features along with built-in and anonymous commenting systems for streamlined feedback.

Axure RP
Axure RP is a powerful commercial ForeUI alternative, renowned for its advanced prototyping capabilities. Available for Mac and Windows, it enables users to plan, prototype, and hand off designs to developers without writing code. It's ideal for complex interactive prototypes and detailed specifications, catering to professional designers who need comprehensive control over their designs.

Diagramo
Diagramo is a free and open-source web-based ForeUI alternative focused on creating and sharing flowcharts, organization charts, and network diagrams. Its simplicity and web-based accessibility make it a convenient choice for users needing basic diagramming and charting functionalities, with features like export to PNG.

MockFlow
MockFlow is a freemium, web-based software-as-a-service (SaaS) that serves as a strong ForeUI alternative for creating mockups and clickable prototypes. With no downloads or installations required, it allows users to access their mockups from anywhere. Key features include page templates, internal links for interactive prototypes, real-time collaboration, and the ability to export to HTML.

Flinto
Flinto for Mac is a commercial ForeUI alternative specifically designed for macOS and iPhone users, offering comprehensive app prototyping capabilities. It allows the creation of everything from simple tap-through prototypes to complex, interactive prototypes with impressive animations, making it a great choice for designers focusing on native mobile app experiences.

Mockup Designer
Mockup Designer is a free and open-source web-based and self-hosted ForeUI alternative. Built with Backbone, Backbone-LocalStorage, and Html2Canvas, it’s a super-easy-to-use mockup tool that leverages your browser's local storage. Its simplicity and open-source nature make it an accessible option for quick prototyping tasks.

WireframeSketcher
WireframeSketcher is a commercial ForeUI alternative that helps users quickly create wireframes, mockups, and prototypes for desktop, web, and mobile applications. It's available as a standalone tool and an Eclipse plug-in, supporting Mac, Windows, and Linux. Known for its user-friendly interface and portability, it's a solid choice for designers working within the Eclipse ecosystem or needing a dedicated wireframing tool.
The world of UI prototyping offers a rich selection of tools beyond ForeUI. From open-source solutions like Pencil Project and Diagramo to powerful commercial platforms like Axure RP and Balsamiq Wireframes, each alternative brings its own strengths in terms of features, pricing, and platform support. We encourage you to explore these options and identify the one that best aligns with your specific design workflow, team collaboration needs, and budget.