Glacier
Open in tool →Three blues from ice to deep water on a pale surface — a monochromatic winter set with real depth.
Color
#2979b3
#2979b3
hex
#2979b3rgb
rgb(41, 121, 179)hsl
hsl(205, 63%, 43%)oklch
oklch(0.556 0.118 244.5)Closest name: Haddock’s Sweater (#277aba)Relative luminance 0.174
Colors that go with #2979b3
Charcoal, Rust 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.
Charcoal #36454f
neutralshippedCharcoal is the text near-black for #2979b3: softer than #000 and cool enough to feel like part of the same palette.
Rust #b7410e
split-complementshippedRust is a split-complement of #2979b3: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Sienna #a0522d
complementaryshippedSienna sits directly opposite #2979b3 on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Amber #ffbf00
shippedAmber is paired with #2979b3 in 9 real palettes, including Wired's brand system and Lemon Squeezy's brand system, as the accent.
Blue #0000ff
shipped12 real palettes, including Activision's brand system and Pixar's brand system put Blue beside #2979b3, as the accent.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #2979b3: 9 real palettes, including Glacier and Hershey's's brand system, as the accent.
Crimson #dc143c
shippedCrimson is paired with #2979b3 in 15 real palettes, including NASCAR's brand system and Wendy's's brand system, as the supporting colour.
Deep Sky Blue #00bfff
shippedDesigners have shipped Deep Sky Blue with #2979b3: 6 real palettes, including Deep Water and Astro's brand system, as the lead colour.
Real palettes that use #2979b3
Tints & shades
Harmonies
Contrast
| #2979b3 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 4.69:1 | pass | pass | fail |
|
Aaon black | 4.48:1 | fail | pass | fail |
Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #2979b3 as the background.
Brands using this color
Palettes built around it
Fonts for this mood
#2979b3 reads as cool, vivid, technical. The font library is tagged with the same vocabulary:
mcpConnect your agent — build around #2979b3
live endpointPoint 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.
endpoint
https://mcp.brandsweets.com/colors/mcpclaude mcp add --transport http brandsweets-colors https://mcp.brandsweets.com/colors/mcp
try this prompt
›analyze #2979b3 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/2979b3-9cafc4-df4e58-1f212d-e9f1f0?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