Design realistic chat UI mockups in your browser. Adjust avatar styles, bubble shapes, colours, and message content with instant preview. Exports HTML for prototype use.
Open Chat Interface Builder → free, no sign-inChat UI mockups are surprisingly tedious to build by hand — bubbles, avatars, timestamps, delivery indicators, the whole visual language of a conversation interface. The Chat Interface Builder lets you design a realistic chat mockup directly in the browser, adjusting avatar styles, bubble shapes, colours, and message content, with an instant preview that looks like the real thing.
Designers presenting chat feature concepts, developers prototyping a messaging interface, product managers putting together a UI specification, or anyone creating a demo, presentation, or onboarding flow that involves a chat-style interface.
No tutorials. No learning curve. Open it and get started.
No server uploads. Generates real HTML output — so your mockup can become a functional prototype with minimal additional work.
Completely free. No trial period. No premium tier for basic functionality. No account required. Use it as often as you need.
One job, done well. Chat Interface Builder was built to solve a specific problem cleanly. No feature bloat, no ads, no distractions.
Can I simulate both sides of a conversation?
Yes — you can add messages from both sender and recipient with distinct styling.
Is this for real chat functionality?
No — this creates a visual mockup. The HTML is for presentation purposes, not live messaging.
Can I use this for a client presentation?
Yes — the output is a realistic-looking chat interface suitable for presenting feature concepts.
Does the export include JavaScript?
Basic interactivity may be included — but the output is primarily a visual prototype.
Can I customise the avatar images?
Avatar styles based on initials and emoji are supported — custom images can be added by editing the HTML.
Free. Instant. No sign-in. Open it and get the job done.
Open Chat Interface Builder on Doathingy.com →