Design language comparison
Plasticity vs Spline
Both Plasticity and Spline commit to a dark-canvas approach, and they pair different display families (matter vs Spline Sans). Beyond surface, motion divides them — Plasticity is subtle, Spline is expressive.
Palette · side by side
Up to 8 dominant swatches eachSide A · dark
Plasticity
Full Page
#ffffff
background
#000000
foreground
#68ff21
brand
#3fd2fb
accent
#f365ff
accent
#ffb801
accent
#212121
foreground
Side B · dark
Spline
Full Page
#ffffff
background
#000000
foreground
#191a1d
foreground
#888888
foreground
#569cd6
accent
#0062ff
accent
#ce9178
accent
#6a9955
foreground
Typography · side by side
Primary family + weight ladder + sampleSide A · dark
Plasticity
Full Page
- Display
- fkGrotesk
- Body
- matter
- Mono
- auxMono
- Weights
- 400
Sample
The quick brown fox jumps over the lazy dog.
1234567890 — Body sample renders in the captured family if your browser has it; otherwise system fallback signals the weight ladder.
Side B · dark
Spline
Full Page
- Display
- Spline Sans
- Body
- ui-monospace
- Mono
- ui-monospace
- Weights
- 400 · 500
Sample
The quick brown fox jumps over the lazy dog.
1234567890 — Body sample renders in the captured family if your browser has it; otherwise system fallback signals the weight ladder.
Spacing scale · side by side
Base unit + first 8 scale valuesSide A · dark
Plasticity
Full Page
- Base unit
- 4 px
- Container max
- 896 px
Side B · dark
Spline
Full Page
- Base unit
- 4 px
- Container max
- 652 px
Motion vocabulary · side by side
Level + durations + easingsSide A · dark
Plasticity
Full Page
- Level
- subtle
- Libraries
- —
Durations
Easings
Side B · dark
Spline
Full Page
- Level
- expressive
- Libraries
- —
Durations
Easings
Palette & spacing overlap
Their palettes share 22% of swatches at the dominant tier — a quiet signal both teams drew from the same neutral library before applying brand accents. Their spacing scales overlap by 75% (2, 4, 6, 8, 10 px shared) — a rhythm any agent can transfer between the two systems with minimal recalibration.
Shared swatches (2)
Curator verdict
Pick a side. Mixing Plasticity's dark-first canvas with Spline's expressive motion vocabulary produces visual whiplash. Adopt one system as your primary, study the other for individual technique transfers (e.g. Plasticity's spacing, Spline's shadow).