Color
#378b5e
#378b5ergb(55, 139, 94)hsl(148, 43%, 38%)oklch(0.573 0.108 156.9)Colors that go with #378b5e
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 #378b5e: softer than #000 and cool enough to feel like part of the same palette.
Crimson #dc143c
split-complementshippedCrimson is a split-complement of #378b5e: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Royal Blue #4169e1
triadicshippedRoyal Blue completes a triad with #378b5e — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Medium Violet Red #c71585
complementaryshippedMedium Violet Red sits directly opposite #378b5e on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Copper #b87333
shippedDesigners have shipped Copper with #378b5e: 5 real palettes, including Wellness and Riverbed, as the supporting colour.
Denim #1560bd
shippedDesigners have shipped Denim with #378b5e: 6 real palettes, including Intel's brand system and Jack Daniel's's brand system, as the supporting colour.
Midnight Blue #191970
shipped4 real palettes, including Paramount+'s brand system and Tide Pool put Midnight Blue beside #378b5e, as the supporting colour.
Sage Green #9caf88
shippedDesigners have shipped Sage Green with #378b5e: 4 real palettes, including Forest Floor and Riverbed, as the lead colour.
Real palettes that use #378b5e
Tints & shades
Harmonies
Contrast
| #378b5e as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 4.19:1 | fail | pass | fail | |
Aaon black | 5.02:1 | 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 #378b5e as the background.
Brands using this color
No public brand in the corpus uses this exact color yet. Extract a brand to add one.
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 #378b5e and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/378b5e-a2beb2-d259d4-1f2d2c-eaf1e9?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