Studio Grey
Open in tool →A pure greyscale with a single electric blue — the portfolio palette that makes work look considered.
Color
#5187fb
#5187fb
hex
#5187fbrgb
rgb(81, 135, 251)hsl
hsl(221, 96%, 65%)oklch
oklch(0.645 0.182 263.4)Closest name: dodgerblue (#1e90ff)Relative luminance 0.2604
Colors that go with #5187fb
Charcoal, Medium Sea Green and Red 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 #5187fb: softer than #000 and cool enough to feel like part of the same palette.
Medium Sea Green #3cb371
triadicshippedMedium Sea Green completes a triad with #5187fb — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Red #ff0000
triadicshippedRed completes a triad with #5187fb — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Amber #ffbf00
shippedAmber is paired with #5187fb in 10 real palettes, including Google's brand system and Heatwave, as the accent.
Blue #0000ff
shipped14 real palettes, including Qualcomm's brand system and Unity's brand system put Blue beside #5187fb, as the accent.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #5187fb: 8 real palettes, including Blue Mono and Carrefour's brand system, as the lead colour.
Crimson #dc143c
shippedCrimson is paired with #5187fb in 8 real palettes, including Behance's brand system and WWE's brand system, as the accent.
Dark Orange #ff8c00
shippedDark Orange shows up next to #5187fb in 4 real palettes, including Playground and Elastic's brand system, as the lead colour.
Real palettes that use #5187fb
Tints & shades
Harmonies
Contrast
| #5187fb as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 3.38:1 | fail | pass | fail | |
Aaon black | 6.21:1 | 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 #5187fb as the background.
Brands using this color
Palettes built around it
Fonts for this mood
#5187fb reads as cool, vivid, technical. The font library is tagged with the same vocabulary:
mcpConnect your agent — build around #5187fb
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 #5187fb and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/5187fb-9ca4c4-df6b4e-211f2d-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