Retro Pop
Open in tool →Fifties-diner red and steel blue with a peach — nostalgic pop that still passes contrast.
Color
#307d9c
#307d9c
hex
#307d9crgb
rgb(48, 125, 156)hsl
hsl(197, 53%, 40%)oklch
oklch(0.556 0.088 228.3)Closest name: Cry Me a River (#427898)Relative luminance 0.177
Colors that go with #307d9c
Charcoal, Crimson and Royal 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 #307d9c: softer than #000 and cool enough to feel like part of the same palette.
Crimson #dc143c
split-complementshippedCrimson is a split-complement of #307d9c: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Royal Blue #4169e1
analogousshippedRoyal Blue is #307d9c's neighbour on the wheel, so the two read as one family — use it for hover states, gradients and secondary surfaces.
Sienna #a0522d
complementaryshippedSienna sits directly opposite #307d9c 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 #307d9c in 8 real palettes, including Beach Hut and Lemon Squeezy's brand system, as the supporting colour.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #307d9c: 7 real palettes, including Glacier and Hershey's's brand system, as the accent.
Copper #b87333
shippedDesigners have shipped Copper with #307d9c: 5 real palettes, including Riverbed and Dusk, as the accent.
Deep Sky Blue #00bfff
shippedDesigners have shipped Deep Sky Blue with #307d9c: 5 real palettes, including Deep Water and Venmo's brand system, as the lead colour.
Real palettes that use #307d9c
Tints & shades
Harmonies
Contrast
| #307d9c as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 4.63:1 | pass | pass | fail |
|
Aaon black | 4.54:1 | pass | 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 #307d9c as the background.
Brands using this color
No public brand in the corpus uses this exact color yet. Extract a brand to add one.
Palettes built around it
Fonts for this mood
#307d9c reads as cool, modern. The font library is tagged with the same vocabulary:
mcpConnect your agent — build around #307d9c
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 #307d9c and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/307d9c-9cb4c4-df4e6b-1f232d-e9f1ef?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