Two great animation tools — different jobs
CSS animations and Lottie animations are both excellent — but they excel at completely different tasks. Choosing the wrong one for a job either overcomplicates something simple or undersells something that deserves to be polished. This guide will help you make the right call every time.
CSS animations: what they're great at
Simple transitions and micro-interactions
Button hover effects, dropdown reveals, fade-ins, slide-ups, spinning loaders — CSS handles all of these beautifully with minimal code. A button that changes color on hover is two lines of CSS. There's no reason to reach for Lottie here.
Performance-critical animations
CSS transforms and opacity changes are GPU-accelerated by default in all modern browsers. They run on the compositor thread, meaning they don't block the main JavaScript thread. For animations that must be perfectly smooth (60fps+), CSS is often the safest choice.
Responsive animations
CSS animations naturally respond to media queries, container queries, and CSS variables. A complex layout that needs to animate differently on mobile vs desktop is easier to handle in pure CSS than in Lottie.
Lottie: what it's great at
Complex illustrated animations
An animated character, a morphing illustration, a detailed icon with multiple simultaneous movements — these are impossible to build reasonably in CSS. Lottie handles them beautifully because they're designed in After Effects by an animator, not coded by a developer.
Brand and emotional moments
Success animations, empty states, onboarding illustrations — moments where you want to delight the user. CSS can create functional animations; Lottie creates emotional ones. The difference is the designer. An animator can spend days crafting a 3-second Lottie animation that would take weeks to recreate in CSS.
Cross-platform consistency
Lottie renders identically on web, iOS, and Android. If you need the same animation to look exactly right on all platforms, Lottie is the right choice. CSS animations can behave differently across browsers and platforms in subtle ways.
The decision framework
- Is it a simple state transition? → CSS
- Is it a hover or focus effect? → CSS
- Does it involve complex illustrated characters or shapes? → Lottie
- Does it need to match a brand animation across iOS, Android, and web? → Lottie
- Is it a loading spinner? → CSS (simple) or Lottie (branded)
- Is it performance-critical and frequently running? → CSS
- Do you have a designer who works in After Effects? → Lottie
Can you mix both?
Absolutely — and many great products do. Use CSS for all the UI micro-interactions and state transitions, and Lottie specifically for the illustrated animations and brand moments. They complement each other perfectly and don't interfere.
Preview Lottie before using it
Before dropping a Lottie animation into your project, preview it in my Lottie player. You can test it on different background colors, check the timing, and even swap the colors to match your brand — then export the modified JSON. Saves a lot of back-and-forth with the After Effects file.