# Your Prototype Is Not Being Honest With Your Users (And Here's How To Fix It)

DevFeed: [Your Prototype Is Not Being Honest With Your Users (And Here's How To Fix It)](<https://devfeed.tech/articles/your-prototype-is-not-being-honest-with-your-users-and-here-s-how-to-fix-it-4282.md>)

Original publisher: [Read original article](<https://smashingmagazine.com/2026/05/prototype-users-fix-protopie/>)

Author: hello@smashingmagazine.com (Eric Joseph L.)

Published: 2026-05-25T12:00:00Z

Content type: tutorial

Language: en

Sources: [Articles on Smashing Magazine -- For Web Designers And Developers](<https://devfeed.tech/sources/articles-on-smashing-magazine-for-web-designers-and-developers.md>)

Topics: [Usability](<https://devfeed.tech/topics/usability.md>), [User interface design](<https://devfeed.tech/topics/ui-design.md>), [Figma](<https://devfeed.tech/topics/figma.md>), [Authentication](<https://devfeed.tech/topics/authentication.md>), [passwords](<https://devfeed.tech/topics/passwords.md>), [No-code](<https://devfeed.tech/topics/no-code.md>), [iOS](<https://devfeed.tech/topics/ios.md>)

Tags: [article](<https://devfeed.tech/tags/article.md>), [authentication](<https://devfeed.tech/tags/authentication.md>), [banking](<https://devfeed.tech/tags/banking.md>), [design](<https://devfeed.tech/tags/design.md>), [figma](<https://devfeed.tech/tags/figma.md>), [how-to](<https://devfeed.tech/tags/how-to.md>), [ios](<https://devfeed.tech/tags/ios.md>), [mobile](<https://devfeed.tech/tags/mobile.md>), [no-code](<https://devfeed.tech/tags/no-code.md>), [prototypes](<https://devfeed.tech/tags/prototypes.md>), [tutorial](<https://devfeed.tech/tags/tutorial.md>), [ui](<https://devfeed.tech/tags/ui.md>), [usability](<https://devfeed.tech/tags/usability.md>), [user-experience](<https://devfeed.tech/tags/user-experience.md>), [user-interfaces](<https://devfeed.tech/tags/user-interfaces.md>), [validation](<https://devfeed.tech/tags/validation.md>)

## AI overview

This tutorial explains how to build a realistic mobile banking login prototype in ProtoPie. It covers importing a login design from Figma, creating functional text and masked-password inputs, validating credentials, displaying live errors, and adding a timed Face ID animation without code.

## Source excerpt

There's a moment in almost every usability session where a participant pauses at the login screen, types something, and glances up: checking whether they're "doing it right." That pause is a clear sign. They've already clocked that this isn't a real app, and every data point collected after that moment is filtered through that awareness.