The "Spaghetti Monster" Problem
If you have ever built a complex prototype in Figma, you know the pain. You want to show a simple interaction: A user clicks a "Dark Mode" toggle.
The Old Way: You duplicate your entire screen. You manually recolor the second screen to black. You draw a prototype noodle connecting Screen A to Screen B.
1. The 4 Types of Variables (Explained Simply)
Figma offers four types of variables. Understanding them is the key to unlocking "smart" design.
Color Variables
What: Store color values (Hex codes).
Use: Theming. A variable named bg-primary that equals "White" in Light Mode and "Black" in Dark Mode.
Boolean Variables
What: Store True (On/Visible) or False (Off/Hidden) values.
Use: Toggles, checkboxes, and visibility states.
Number Variables
What: Store math values (1, 2, 100).
Use: Counters. Clicking "Add to Cart" changes the cart number from 0 to 1.
String Variables
What: Store text.
Use: Localization. Switch your entire app from "English" to "Spanish" instantly.
2. Practical Tutorial: Building a "Dark Mode" Switch
Let's build that Dark Mode toggle properly—without duplicating a single frame.
- Open the "Local Variables" panel
- Create a collection named "Theme"
- Add two columns (Modes): Name one "Light" and the other "Dark"
- In the "Light" column, set it to
#FFFFFF - In the "Dark" column, set it to
#121212
- On Click → Set Variable
- Target: Theme Mode
- Value: Dark (or toggle between modes)
Now, when you play the prototype and click the button, the entire app repaints itself instantly. No duplicate screens required!
3. Pro Tip: Variables vs. Component Properties
Many designers get confused: "When do I use Variables and when do I use Component Properties?"
Use Variables for state (e.g., Is the user logged in?). This happens while the user is interacting with the prototype.
Conclusion
Variables turn you from a "Screen Drawer" into a "System Architect." They make your files smaller, your prototypes faster, and your developer handoff cleaner. If you aren't using them in 2026, you are working twice as hard as you need to. Want more Figma tips? Check out our complete Figma keyboard shortcuts guide and explore our free Figma UI kits.
FAQ: Figma Variables
Figma Variables allow you to create dynamic prototypes that change based on logic (like toggles, counters, or themes) without duplicating screens. They're essential for building scalable design systems and interactive prototypes.
Boolean variables store True/False values (perfect for toggles and visibility), while String variables store text (perfect for localization or dynamic labels). Use Boolean for on/off states, String for text content.
Yes! Number variables can control spacing, sizing, and layout values. You can create a "Screen Size" variable that changes padding, font sizes, and component arrangements based on Mobile/Tablet/Desktop modes.
Absolutely! Variables can be published in shared libraries and used across multiple files. This makes them perfect for design systems where you want consistent theming and behavior across projects.
Use the "Set variable" action in prototype mode. When a user clicks a button, trigger "Set variable" to change a Boolean (show/hide), Number (increment counter), String (change language), or Color (switch theme) value.
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