Color
#1b3bee
#1b3beergb(27, 59, 238)hsl(231, 86%, 52%)oklch(0.48 0.263 266)Colors that go with #1b3bee
Charcoal, Crimson and Amber 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 #1b3bee: softer than #000 and cool enough to feel like part of the same palette.
Crimson #dc143c
triadicshippedCrimson completes a triad with #1b3bee — 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 #1b3bee in 5 real palettes, including Walmart's brand system and Binance's brand system, as the accent.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #1b3bee: 11 real palettes, including Zillow's brand system and Oreo's brand system, as the supporting colour.
Cornflower Blue #6495ed
shippedDesigners have shipped Cornflower Blue with #1b3bee: 9 real palettes, including Qualcomm's brand system and Canva's brand system, as the supporting colour.
Denim #1560bd
shippedDesigners have shipped Denim with #1b3bee: 9 real palettes, including Pixar's brand system and Dairy Queen's brand system, as the supporting colour.
Dodger Blue #1e90ff
shippedDesigners have shipped Dodger Blue with #1b3bee: 10 real palettes, including Unity's brand system and Cargo's brand system, as the lead colour.
Firebrick #b22222
shippedDesigners have shipped Firebrick with #1b3bee: 5 real palettes, including 3M's brand system and MLB's brand system, as the supporting colour.
Real palettes that use #1b3bee
Tints & shades
Harmonies
Contrast
| #1b3bee as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 7.22:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 2.91:1 | 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 #1b3bee as the background.
Brands using this color
Fonts for this mood
#1b3bee reads as cool, vivid, technical. 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 #1b3bee and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/1b3bee-9c9ec4-df834e-231f2d-e9eef1?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