Best Free Prototyping Software

Lunacy is a vector graphic software for UI/UX and web design. It's faster than Figma, smarter than Sketch! Key features: * FREE for personal and commercial use * Runs on Windows, macOS, and Linux * WORKS ONLINE AND OFFLINE You can work both with cloud and local documents. It's up to you to choose. You can switch between the cloud and local modes whenever you want. * REAL-TIME COLLABORATION between users on different platforms * BUILT-IN GRAPHICS (Icons, Photos, Illustrations) and AI-POWERED TOOLS (Background remover, Image upscaler, Avatar & Text generators) * FULL SUPPORT of .SKETCH DOCUMENTS: Open, Edit, Save. * LOW SYSTEM REQUIREMENTS and MINIMUM LEARNING CURVE *NO BOUNDS Thanks to the native support for the Sketch format, you can use Lunacy with all major hand-off and version control tools like Avocode, Zeplin, Abstract, Simpli, etc. If it is necessary, you can easily import .sketch files to Figma or XD.

Simitless lets you build an information system that fits you without a line of code. You'll be able to collaborate on your database and information system in real-time and simply configure what you need when you need it. If starting from scratch seems too daunting, start from one of our hundreds of application templates and tune it your way. No more will you need to change the way you want to work to suit a software you have to use. Simitless is a software platform, enables professionals to build their own information systems. They are databases intended to inform decisions and help work management. We empower small companies by letting them build the information system that suits them, worthy of the tools available only for large conglomerates. Save your time and money by consolidating your information into one centralized and secure collaboration application.

Appsmith is a low code developer tool for quickly building UIs and connecting to a wide range of data sources. You can drag and drop pre-built components to build UI on the open grid-style canvas. When it comes to adding logic, transforming data, and defining workflows. Appsmith lets you insert plain Javascript right inside any widget, query, or almost any other setting. - Start by linking to an existing datasource such as a database or an API. Appsmith has plug-and-play support for most databases, Rest APIs, and GraphQL, so you can seamlessly import your data. - Next, you can use pre-made widgets to easily layout an app, and move them around to optimize usability - Get the app running by connecting the UI to the datasource. You can do this by writing queries or calling APIs. Remember, you can control everything with JavaScript! - Finally, deploy the app. You can also integrate with your CI/CD, create git branches for different environments to safely develop, test and deploy

MockFrame by 500apps is a wireframe tool for creating mockups, prototypes, and user interfaces. This web-based software allows you to build a web or app design without coding. You can share your work with others to demonstrate the final product or send it to clients. Generate low & high-fidelity wireframes for mobile apps and desktops. Get 37+ apps with MockFrame at Just $14.99/month.

Your design is not stored internally in a custom data structure that has to be exported to code. Instead, we are always editing your code on the fly, allowing designers and developers to share files. Create unique responsive layouts with ease and without constraints by harnessing the power of the Web Platform. Our grid tool is the most powerful and easy-to-use grid system out there. Our GUI makes writing code unnecessary for designing. But, even so, you are actually generating your own code that you or your developer teammate can modify at any time. Imagine what you can build together. Colors, sizes, fonts, margins everything will look exactly like your users will see it, and developers won't have to spend time again guessing the designer's intentions.