Named color
Interstellar Blue
#001155rgb(0, 17, 85)hsl(228, 100%, 17%)oklch(0.229 0.123 263.6)Interstellar Blue on this page is the real value, not a screenshot: exact hex, RGB, HSL and OKLCH, ten tints and ten shades, classic harmonies, and WCAG contrast with fixes — plus the 2 public brands that use it and the palettes it appears in.
Colors that go with Interstellar Blue
Charcoal, Crimson and Steel Blue 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.
Charcoal #36454f
neutralshippedCharcoal is the text near-black for Interstellar Blue: softer than #000 and cool enough to feel like part of the same palette.
Crimson #dc143c
triadicshippedCrimson completes a triad with Interstellar Blue — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Steel Blue #4682b4
analogousshippedSteel Blue is Interstellar Blue's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Blue #0000ff
shipped7 real palettes, including Penpot's brand system and Monzo's brand system put Blue beside Interstellar Blue, as the supporting colour.
Cadet Blue #5f9ea0
shippedDesigners have shipped Cadet Blue with Interstellar Blue: 6 real palettes, including SoFi's brand system and Arctic, as the supporting colour.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with Interstellar Blue: 10 real palettes, including Glacier and MLB's brand system, as the accent.
Deep Sky Blue #00bfff
shippedDesigners have shipped Deep Sky Blue with Interstellar Blue: 7 real palettes, including Deep Water and Blueprint, as the lead colour.
Denim #1560bd
shippedDesigners have shipped Denim with Interstellar Blue: 19 real palettes, including British Airways's brand system and Paramount+'s brand system, as the supporting colour.
Real palettes that use Interstellar Blue
Tints & shades
Harmonies
Contrast
| Interstellar Blue as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 17.34:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 1.21:1 | 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 Interstellar Blue as the background.
Brands using this color
Fonts for this mood
Interstellar Blue 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 #001155 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/001155-9c9fc4-df7c4e-231f2d-e9eff1?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