Color
#100a8a
#100a8argb(16, 10, 138)hsl(243, 86%, 29%)oklch(0.3 0.189 268.1)Colors that go with #100a8a
Steel Blue, Olive Green and Sienna lead the list. Each partner is a real named colour with the reason it works — a wheel relationship, a neutral that carries it, or a pairing lifted from a palette or brand system that actually shipped — and every pair opens in the palette tool.
Steel Blue #4682b4
analogousshippedSteel Blue is #100a8a's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Olive Green #808000
complementaryOlive Green sits directly opposite #100a8a on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Sienna #a0522d
split-complementSienna is a split-complement of #100a8a: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Cobalt Blue #0047ab
shippedCobalt Blue is paired with #100a8a in two real palettes: Glacier and Blue Mono, as the accent — a combination designers have actually shipped, not a computed rotation.
White Smoke #f5f5f5
neutralWhite Smoke is the surface for #100a8a: a clean near-white with no warm cast, so the cool hue stays clear instead of drifting muddy.
Forest Green #228b22
triadicForest Green completes a triad with #100a8a — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Crimson #dc143c
triadicCrimson completes a triad with #100a8a — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Blue Violet #8a2be2
analogousBlue Violet is #100a8a's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Real palettes that use #100a8a
Tints & shades
Harmonies
Contrast
| #100a8a as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 14.66:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 1.43:1 | fail | fail | fail |
Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #100a8a as the background.
Brands using this color
No public brand in the corpus uses this exact color yet. Extract a brand to add one.
Fonts for this mood
#100a8a reads as cool, vivid, dark. The font library is tagged with the same vocabulary:
Point any MCP client at the shared colors endpoint and your agent gets the same engine as this page — direct_palette, edit_direction, check_palette, check_contrast — read-only, no key. Every direction it proposes comes with a /colors/d/… link: open it, lock what you like, paste the link back, and the agent edits rather than re-rolls.
https://mcp.brandsweets.com/colors/mcpclaude mcp add --transport http brandsweets-colors https://mcp.brandsweets.com/colors/mcp
›analyze #100a8a and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/100a8a-a39cc4-dfa04e-261f2d-e9edf1?lock=0&style=vibrantWant the agent to remember your picks and write them into a living brand? Create a free BrandSweets workspace.
Machine-readable: color.md