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Title:Free design and prototyping tool for web & mobile apps

Description:Easily create web and mobile app prototypes and wireframes with Justinmind UI prototyping tool. It's FREE. Start prototyping now!

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Fetched At:October 25, 2025

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h1Interaction design and prototyping tool for web and mobile apps

h2Create hi-fi prototypes and simulations. Avoid rework. Boost user adoption

h2From clickable prototypes to functional simulations

h2Bring your interaction design to a superior level

h2Free UI Design with no limits

h2From low to high fidelity

h2Forms and data in motion

h2Bring your prototypes to life in a click

h2A free prototyping tool to rule all screens

h3It's easy to get started and it's Free!

h2Design better experiences together

h2Design Systems

h2Design and prototyping features you’ll love

h2Free design templates

h2Interactive UI components

h2Integrations and plugins

h2Export to HTML and images

h2Manage requirements

h2Export specification documents

h2Success stories

h2Temple University inspires the next generation of designers with Justinmind

h2How middle schoolers are designing mobile apps with Justinmind

h2How TokBox solved rework problems with Justinmind

h2Recommended reading

h2Try the most powerful design and prototyping tool

h3Validate early, prototype better, communicate faster

Markdown Content

Free design and prototyping tool for web & mobile apps

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- Product

- Interaction design

Interaction design tools
- UI design

Free ui design software
- forms-and-data-menu

Forms and data

Simulate forms and data
- user-flow-menu

User flows

Diagram user flows
- Collaboration

Design better together

Justinmind 10.7

iOS 18 UI library, latest devices, and more

- Integrations
- Design Systems
- All features
- Use cases

- Wireframing

Free tools to create wireframes
- Prototyping

Prototyping tools for web and apps
- specifications-menu

Specifications

Create specifications like a pro

- Websites and Web apps
- Mobile app design
- Templates
- Free resources

- help-center-menu

Help Center

Training and how-tos
- Design Templates

Free design templates
- Interactive UI components

Web, iOS, Android and more UI kits

- Customer stories
- Blog
- UX talks
- Pricing
- Sign in

Download Free

# Interaction design and prototyping tool for web and mobile apps

## Create hi-fi prototypes and simulations. Avoid rework. Boost user adoption

Download Free

MacOS

Windows

Add web interactions and mobile gestures to prototypes

## From clickable prototypes to functional simulations

Create from clickable prototypes to fully-functional simulations, without typing a single line of code. We provide a full range of tools, so that you can focus on creating delightful user experiences. Testing through simulations will reduce rework and boost user adoption.

## Bring your interaction design to a superior level

Design full interactions of your web and mobile products, from the navigation to the last details of the user experience: advanced interactions, animations, transitions, interactive UI elements. Launch easy to use products and boost user adoption.

Interaction design for web and mobile app prototypes

Web interactions

Design web experiences with a full range of interactions, animations and transitions. Create anything from simple links to advanced interactions.

Mobile gestures

Choose from a ton of gestures that allow you to rotate, tap, swipe, scroll and pinch your way through your mobile app prototype.

Sequences and conditions

Add sequences of actions and conditions in your interactions. Design and test the real experience.

UI vector design

## Free UI Design with no limits

Design your UI assets for free, without any restrictions on number of projects. Enjoy all UI design features, from the vector design tool, the pen tool, to pathfinders and more.

From low to high fidelity prototypes

## From low to high fidelity

With a single tool, you can cover the entire cycle of designing your products. Start by conceptualizing with low-fidelity wireframes, iterate, and validate your designs with high-fidelity prototypes and even interactive simulations.

Learn about wireframe tools

Prototype forms and data lists interaction

## Forms and data in motion

Design, prototype and simulate fully-functional forms and data grids-lists, and test them instantly without writing a single line of code.

View and export prototypes on desktop and mobile devices

## Bring your prototypes to life in a click

Visualize your web and mobile prototypes, while you design them. Simulate prototype behavior while you design. Use our Emulator and Viewer App to test your prototype live on any iPhone, iPad or Android device.

## A free prototyping tool to rule all screens

### It's easy to get started and it's Free!

Download Free

## Design better experiences together

Validate early and often. Allow all your stakeholders to test and review your prototype, leaving no room for misunderstandings. Improve communication between teams, putting them all on the same page.

Share and get feedback on web and mobile prototypes

Share and get feedback

A single click lets you publish your prototypes and invite all project stakeholders to give feedback early on.

Team prototyping

Multiple users can work on or edit the same prototype simultaneously. Our version control system tracks the changes.

Design handoff for developers

Developers can inspect prototypes and get UI assets. Keeping developers in the loop means your designs get built pixel perfect

Interactive prototypes help us learn quickly and iterate, so that we can create great products

Meagan Timney

Senior Product Designer

Efficiently showing our requirements has led to highly functional, well-designed products that our clients love

Kacie Conroy

Senior Business Analyst

With the ability to create prototypes across different screen sizes and devices, we are able to validate hypotheses prior to creative design and build

Chris Murray

Director User Experience

## Design Systems

Keep consistency in your Style Guides, UI component libraries, interactions, templates and other deliverables. Share your assets with design teams, business analysts and developers.

Create your own UI Kits

Easily refine and reuse the built-in libraries or create your own. Personalize them with your own style and interactions.

Share and sync UI components

Centralized management for your UI kits. Maintain your UI elements and style guides synchronized across all your teams.

Reuse via templates and masters

Templates and masters allow you to share and reuse content (headers, footers and more) across all the screens of a prototype.

## Design and prototyping features you’ll love

## Free design templates

Speed up your prototyping process with design resources and UI components pre-installed in our free prototyping tool.

## Interactive UI components

Speed up your prototyping process with ready-made and frequently updated UI kits. You can also create your own UI kits with personalized components.

## Integrations and plugins

By combining our design and prototyping strength and other design, project management and user testing tools, you’ll be able to create and test hi-fi prototypes.

## Export to HTML and images

You can export your prototype to a fully functional and interactive HTML. Additionally, we provide an extensive set of features to export your assets to SVGs and PNGs.

## Manage requirements

Add and manage text requirements within the UI prototype and integrate the requirements in your preferred Agile tool.

## Export specification documents

With a single click, generate specifications documents from your prototypes. Create your own specifications document templates or use our API to generate the assets you need.

## Success stories

Find out why thousands of users love to use Justinmind to create web and mobile app prototypes.

## Temple University inspires the next generation of designers with Justinmind

Philadelphia’s Temple University bridges the gap between design and business with a little help from Justinmind

Read story

## How middle schoolers are designing mobile apps with Justinmind

What happens when middle schoolers build prototypes with Justinmind? A whole heap of innovation

Read story

## How TokBox solved rework problems with Justinmind

TokBox’s web and mobile app prototyping better since Interaction Designer Charles Diggs found the right prototyping tool

Read story

## Recommended reading

Learn more about the industry best practices, keep up with recent Justinmind updates and hear all about the latest trends of UX design.

Amazing Content

The ultimate guide to wireframe design

Guide to prototyping web and mobile apps

The full guide to UI design

All you need to know about UX design

Best practices and methods for user testing

Guide to design web and mobile apps