#37515B
Closest named color: Dark Slate Gray (#2F4F4F). oklch(41.8% 0.036 223.9), rgb(55, 81, 91).
Aa
White text reads best on this color (8.43:1).
About this color
#37515B is a dark, muted teal or cyan. In OKLCH its lightness is 42%, its chroma 0.036 and its hue 224°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.023 away. White text reads best on it, at 8.43:1.
| Hue family | Teals and cyans |
| Lightness | dark (42%) |
| Chroma | muted (0.036) |
| Temperature | cool |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.49:1 |
| White text | 8.43:1 |
Values
| HEX | #37515B |
| RGB | rgb(55, 81, 91) |
| HSL | hsl(197, 25%, 29%) |
| OKLCH | oklch(41.8% 0.036 223.9) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #37515B | 8.43:1 | AAA | Lc -93.6 | Preferred for body text |
| Black text on #37515B | 2.49:1 | Fails | Lc 15.0 | Not readable |
| #37515B text on white | 8.43:1 | AAA | Lc 89.0 | Fine for body text |
| #37515B text on black | 2.49:1 | Fails | Lc -13.2 | Not readable |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 800.
-
Step 50
50
#F3F6F7
oklch(97.1% 0.003 219.5)
-
Step 100
100
#E6EBED
oklch(93.7% 0.006 223.5)
-
Step 200
200
#D1DBDF
oklch(88.5% 0.012 223.5)
-
Step 300
300
#B3C4CB
oklch(80.9% 0.021 224.4)
-
Step 400
400
#8BA6B0
oklch(70.8% 0.033 222.3)
-
Step 500
500
#6E8F9D
oklch(63% 0.043 225.8)
-
Step 600
600
#557A87
oklch(55.7% 0.046 221.8)
-
Step 700
700
#456673
oklch(49% 0.043 224.5)
-
Step 800
800 (this color)
#37515B
oklch(41.8% 0.036 223.9)
-
Step 900
900
#32454D
oklch(37.8% 0.028 225.7)
-
Step 950
950
#1D282D
oklch(26.9% 0.018 227.5)
#37515B with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #4B505C | 0.028 |
| Deuteranopia (no green cones) | #464B5B | 0.027 |
| Tritanopia (no blue cones) | #2A5454 | 0.023 |
| Achromatopsia (no color) | #4D4D4D | 0.036 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37515B
#37515B
oklch(41.8% 0.036 223.9)
- #5E473D
#5E473D
oklch(42% 0.036 44.6)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #37515B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.023
- Deep Teal #00555A ΔE 0.040
- Dark Grey Blue #29465B ΔE 0.042
- Charcoal #264653 ΔE 0.044
- Petrol #005F6A ΔE 0.051
- YInMn Blue #415A77 ΔE 0.052
- Dark Teal #014D4E ΔE 0.052
- Charcoal Grey #3C4142 ΔE 0.055
Use #37515B in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.