Free mockup tool to design web and mobile apps

Bring your web and mobile concepts to life

mockup tool for UX design

Easily design interactive website mockups

Design responsive, pixel perfect and highly interactive website mockups without any code using our UI mockup tool. Test drive your mockup in Justinmind or on any browser to instantly test its features and get useful feedback on your design.

Responsive website mockups

The perfect mockup tool to design responsive websites that adapt to any screen resolution.

liquid layouts for different screen resolutions
Liquid layouts

Design liquid layouts to suit various screen resolutions for a truly responsive website mockup.

elements with auto-resize for responsive mockups
Auto-resize elements

Make an element automatically resize to adapt to different screen resolutions.

pinning elements on a position on mockup screen

Justinmind lets you pin elements to a specific position of a web page.

website mockup tool for visual design

Visual design for websites

Design interactive and illustrious pixel-perfect website mockups.

Design features

Crop and adjust your images. Change styles, transparency, border, size, margin and more.

Clickable images

Make any image you import clickable with hotspots for interactive navigation.

Import from design tools

Design images with Sketch or Photoshop. Import them into our tool and add interaction!

Design data visualization

Choose how to visually represent the data in your website mockup with the data lists and grids feature. Design smart forms, define interactions and test them with your users.

website mockup tool for interactive forms
data list visualization in mockups
data grid visualization in mockups
Forms interaction

Design smart forms with interactions like input, drop-downs and radio buttons to simulate the user experience.

Data lists

Visually display your mockup’s data in list format, using the data lists feature.

Data grids

Design your data visualization in grid or cell format.

Design and test mobile app UIs before coding

Design your mobile app mockups and test them on real devices to get user feedback early in the design process. Use our free mockup tool to simulate your designs on mobile and tablet screens – spot potential problems before any coding starts!

Device emulators for mockups

Simulate your mobile mockup on desktop screens, or test it out on real devices like smartphones and tablets to get important feedback from users and stakeholders.

Test app mockups on device

Test your mobile app mockups on real devices to see if your design works. Simply download the Justinmind app from the App Store or Google Play, sign in and start validating your designs with real users.

Free UI kits

Get access to a wide range of free UI kits with our mockup tool. Our UI kits are full of pre-designed, interactive and static elements and components.

ui kit for web apps in mockup tool
ui kit for ios and android included in mockup tool
create your own ui kits in mockup tool
Website and web apps

The Justinmind Web UI kit comes pre-installed in the mockup tool. Get every component you need for your next website mockup.

iOS and Android

Design intuitive iOS and Android app mockups that look and act the part with our free iOS and Android UI kits.

Create your own UI kits

Create your own brand-specific UI kits without any code. Sync any updates in your kit and share instantly with the rest of the team.

Import your designs to the mockup tool

Import images from your favorite design tools into Justinmind. Our Sketch, Photoshop and Adobe Illustrator integrations let you design pixel perfect mockups while adding interaction.

import from adobe design tools into mockup
import visuals from sketch into mockup

Import your Sketch artboards to the mockup tool as individual layers or full images and add interactions!

import from photoshop into mockup

Get interactive mockups from your PSDs. Export your PSDs as one image or turn text, shapes and images into elements!

import from illustrator into mockup

Import your vector graphics into the Justinmind tool and generate fully functional and interactive mockups.

Collaborate on mockups

Work alongside teammates on the same mockup and get feedback on any aspect of your design. Share your mockup simulations remotely with stakeholders, clients and users. Quickly generate UI specifications for a seamless developer handoff.

collaboration boost in mockup design
mockup tool for easy developer designer hand-off
Handoff for developers

Instantly generate deliverables for a smooth designer handoff when it’s time to code.

mockup tool for teamwork and collaborating

Collaborate on mockups with multiple users. Leave comments and see changes in real-time.

Our advanced mockup tool features

Empower your mockups with templates and masters. Put your users first with advanced testing and user flow diagrams. Boost collaboration with instant deliverables and online sharing, while letting you team benefit from JIRA and TFS integrations.

mockup design with templates and masters
Templates & masters

Reuse content, functions and design patterns across all screens in your mockup.

export documents from mockup tool
Export to documents

Generate specifications documents for your mockups and instantly get deliverables to hand off to developers.

export mockups into interactive html
Interactive HTML

Share your mockups online by exporting to HTML so your collaborators can open them in any web browser.

Mockup tool to map out user flow diagrams
User flow diagrams

Use the Justinmind mockup tool to map out user navigation flows and define the layout of your mockups.

Mockup tool with JIRA and TFS integration
JIRA & TFS integration

Manage Atlassian JIRA Issues and TFS Tasks in Justinmind with two-way integration between the tools.

Mockup tool for remote and real time user testing
User testing

Keep your test users in the loop. Have them test your mockups in real time or remotely, have them leave comments and vital feedback!