Design language comparison
Comet vs Spline
Both Comet and Spline commit to a dark-canvas approach, and they pair different display families (system-ui vs Spline Sans). Beyond surface, motion levels are both expressive.
Palette · side by side
Up to 8 dominant swatches eachSide A · dark
Comet
Full Page
#313131
foreground
#0000ee
brand
#d9d9d9
neutral
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
Comet
Full Page
- Display
- system-ui
- Body
- monospace
- Mono
- monospace
- Weights
- 400 · 600
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
Comet
Full Page
- Base unit
- 8 px
- Container max
- 960 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
Comet
Full Page
- Level
- expressive
- Libraries
- —
Durations
Easings
Side B · dark
Spline
Full Page
- Level
- expressive
- Libraries
- —
Durations
Easings
Palette & spacing overlap
Palette overlap is zero — Comet and Spline live in completely different chromatic registers, even when their layout grids feel adjacent. Their spacing scales overlap by 17% (8, 16 px shared) — a rhythm any agent can transfer between the two systems with minimal recalibration.
Curator verdict
If you are building an interface that needs to reference both, Comet's restraint reads as the safer default and Spline's rhythm provides the accent moments — pair them at section-level, not at component-level.