authentication forms are usually boring. text fields, a submit button, maybe some validation messages. but what if your login page could feel alive? what if an anime character reacted to what you typed?
that's exactly what anilogin does.
what is anilogin?
anilogin is a reactive authentication interface that features an animated japanese anime character who responds to your typing in real-time. the character watches what you type in the email field, politely closes their eyes when you enter your password, blinks naturally, and displays contextual thought bubbles based on your interactions.
you can try the live demo here: https://iamovi.github.io/AniLogin/
technical implementation
the project is built with modern web technologies:
- react with typescript for type safety and component architecture
- vite for blazing fast development and optimized builds
- tailwind css and shadcn/ui for consistent, responsive design
- custom animation logic for character interactions
the character system
the most interesting part of this project is the character animation system. it's not just a static image with some basic transforms. the implementation includes:
context-aware eye animations: the character's eyes respond to which input field you're focused on. when you type in the email field, the eyes track your text input. when you switch to the password field, the character respectfully closes their eyes with the thought bubble "I'm closing my eyes! I'm not seeing your pass! 🙈"
frame-accurate eyelid blinking: the character blinks naturally using physics-based timing. the blinks aren't random - they follow realistic patterns that make the character feel alive.
cel-shaded anime aesthetic: the character design follows authentic japanese animation principles with proper cel-shading techniques, giving it that classic anime look.
dynamic feedback system: the thought bubble changes based on what you're doing. typing in different fields, submitting the form - each action triggers contextually relevant thoughts from the character.
the interaction algorithm
the core of the interaction is input field tracking. here's how it works conceptually:
- detect which input field currently has focus
- track the content being typed in real-time
- apply appropriate character animations based on field type
- for password fields, trigger eye-closing animation
- for email fields, show active watching state
- smooth transitions between states with easing functions
- sync the eyelid animations to maintain natural blinking patterns
the result is a character that genuinely seems to be paying attention to what you're typing, while respecting your privacy when entering sensitive information.
why build this?
beyond the novelty factor, this project explores several interesting frontend challenges:
real-time interaction design: how do you make animations feel responsive without being distracting? how do you balance personality with privacy?
performance optimization: tracking input events and updating character animations needs to run smoothly without janking the rest of the ui.
accessibility considerations: animated interfaces need careful handling. the character provides visual feedback, but the form itself remains fully functional with or without the animations.
component architecture: separating the character logic from the form logic while keeping them synchronized requires thoughtful component design.
getting started
want to run it locally? the setup is straightforward:
git clone https://github.com/iamovi/AniLogin.git
cd AniLogin
npm install
npm run dev
the project uses a standard react + vite setup, so if you've worked with modern frontend tooling, you'll feel right at home.
potential use cases
while this started as an experimental ui project, there are practical applications:
- engaging landing pages that need to stand out
- educational platforms where character interaction enhances learning
- gaming-related authentication where the aesthetic matches the product
- portfolio pieces for frontend developers specializing in interactive design
- prototyping tools for testing user engagement with animated interfaces
- privacy-conscious applications that visually demonstrate data protection
technical details worth noting
the project demonstrates several advanced frontend techniques:
custom hooks for animation: the character system uses custom react hooks to manage animation state, making it reusable and testable.
input event handling: form field interactions trigger character state changes smoothly without blocking user input.
responsive calculations: the character animations work consistently across different screen sizes and viewport dimensions.
state management: user interactions, character state, and form validation all need to stay synchronized. the architecture handles this without prop drilling or overly complex state patterns.
the privacy consideration
one of the most thoughtful aspects of anilogin is how it handles password entry. when you focus on the password field, the character immediately closes their eyes and displays a reassuring message. this isn't just a cute animation - it's a visual metaphor for privacy and security that helps build trust with users.
final thoughts
anilogin shows that authentication doesn't have to be purely functional. with thoughtful design and solid technical implementation, even something as mundane as a login form can become memorable and build user trust through personality.
the code is open source under the mit license, so feel free to fork it, learn from it, or build something entirely new with the concepts.
check out the live demo: https://iamovi.github.io/AniLogin/
grab the source: https://github.com/iamovi/AniLogin
what would you add to make it even more engaging? drop your thoughts below.
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