A design system team I consulted with had built redundant parallel systems — both extensive style libraries and extensive variable collections covering largely overlapping properties — having adopted variables when this newer system launched without first establishing clear guidelines for when variables versus traditional styles genuinely served their team’s needs better, resulting in confusing duplication rather than a clear, complementary system.
What Genuinely Distinguishes Variables From Styles
Both systems address the broader design system goal of maintaining consistent, centrally-manageable design values, but they differ in specific capabilities that matter for choosing appropriately between them.
Styles are Figma’s longer-established system for saving reusable property values — colors, text styles, effects, grid layouts — that can be applied across multiple elements and updated centrally when the underlying style definition changes.
Variables provide additional capability beyond basic styles, specifically supporting different values across different modes (light and dark theme variants, for example, or different brand variants within a multi-brand design system) and supporting more complex conditional logic in some implementations, capabilities that traditional styles do not provide.
When Styles Remain the Better Choice
Simple, single-context values without mode variation needs: If a specific design token genuinely has just one value that does not need to vary based on theme, brand, or other contextual mode, traditional styles handle this straightforward case perfectly well without needing variables’ additional mode-switching complexity that would not actually provide any benefit for this kind of single-value need.
Established team familiarity and existing extensive style libraries: For teams with deeply established style-based workflows and extensive existing style libraries, the migration effort to convert genuinely single-value properties to variables may not provide proportional benefit if those specific properties genuinely never need the mode-switching capability variables specifically add, making continued style use reasonable for these specific genuinely single-context properties even as variables get adopted for properties that do benefit from their additional capability.
When Variables Are the Better Choice
Theme switching (light/dark mode) support: This is genuinely the most common driver for variable adoption, since supporting both light and dark theme variants for the same underlying design system requires exactly the mode-switching capability that variables specifically provide and traditional styles do not support.
Multi-brand design systems: Similarly, if your design system genuinely needs to support multiple distinct brand variants sharing an underlying structure but differing in specific values (different brand colors applied to the same underlying component structure, for example), variables’ mode-switching capability addresses this multi-brand need considerably better than attempting to manage this through separate, non-connected style libraries for each brand variant.
Values requiring conditional logic based on context: For more sophisticated design systems where certain values genuinely need to respond to contextual conditions beyond simple theme or brand switching, variables’ more advanced capability in some implementations can address this need in ways traditional styles’ simpler, single-value model cannot.
Why My Client’s Redundant System Created Genuine Problems
Beyond simply being inefficient duplicated effort, their redundant parallel systems created genuine confusion about which system represented the actual current source of truth for any specific design value, with team members sometimes updating a style without realizing a parallel variable existed for that same conceptual value, or vice versa, leading to actual inconsistency between supposedly synchronized systems that were not actually connected to each other despite covering overlapping conceptual ground.
This is exactly the kind of problem that establishing clear guidelines from the start — which specific properties use variables versus traditional styles, based on the genuine criteria discussed above — would have prevented, rather than allowing organic, ungoverned parallel adoption of both systems without clear decision criteria guiding which system should handle which specific properties.
A Practical Migration Strategy for Existing Style-Based Systems
For teams with established style libraries considering variable adoption, rather than wholesale, immediate conversion of everything to variables, I generally recommend a targeted approach: identify specifically which existing properties genuinely need variables’ mode-switching capability (typically driven by an actual upcoming need like dark mode support or multi-brand expansion), and migrate specifically those properties to variables while leaving genuinely single-context properties on traditional styles, rather than treating variable adoption as requiring complete wholesale system replacement regardless of whether every individual property actually benefits from the additional capability.
Plugin Support for Variable and Style Management
As referenced in our design system automation guide, plugins like Tokens Studio provide structured management capability spanning both variables and styles, which can help maintain clarity about which system handles which specific properties as your design system evolves, rather than relying purely on team documentation and discipline to maintain this clarity without supporting tooling.
A Quick Reference Decision Framework
| Scenario | Recommended System | Reasoning |
|---|---|---|
| Single-value property, no mode variation needed | Styles | Variables’ mode capability provides no benefit here |
| Light/dark theme support | Variables | Specifically designed for this mode-switching need |
| Multi-brand design system | Variables | Mode-switching addresses brand variant needs |
| Established style library, no variation need | Styles (maintain existing) | Migration effort not justified without genuine benefit |
| Conditional logic based on context | Variables | More advanced capability for sophisticated needs |
What I Told My Client About Their Redundant Systems
I recommended a deliberate audit identifying which specific properties genuinely required variables’ mode-switching capability (driven by their actual planned dark mode and multi-brand expansion work) versus which properties were genuinely single-context and could remain on traditional styles, consolidating their redundant parallel systems into this clearer, criteria-based division rather than continuing to maintain confusing, overlapping coverage across both systems without clear guidance about which represented the actual source of truth for any specific value.
This consolidation effort took some genuine upfront time investment, but resolved the confusing duplication and occasional inconsistency their ungoverned parallel adoption had created, establishing clearer ongoing guidelines for future property additions to prevent this same redundancy problem from re-emerging as their design system continued evolving beyond this initial consolidation effort.
Does your team currently have light/dark mode or multi-brand needs, or are you working with primarily single-context design values? Describe your situation and I can help you think through which system genuinely fits your specific properties.