#37515F
Closest named color: Dark Slate Gray (#2F4F4F). oklch(42% 0.039 232.4), rgb(55, 81, 95).
Aa
White text reads best on this color (8.38:1).
About this color
#37515F is a dark, muted blue. In OKLCH its lightness is 42%, its chroma 0.039 and its hue 232°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.030 away. White text reads best on it, at 8.38:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | muted (0.039) |
| Temperature | cool |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.50:1 |
| White text | 8.38:1 |
Values
| HEX | #37515F |
| RGB | rgb(55, 81, 95) |
| HSL | hsl(201, 27%, 29%) |
| OKLCH | oklch(42% 0.039 232.4) |
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 #37515F | 8.38:1 | AAA | Lc -93.4 | Preferred for body text |
| Black text on #37515F | 2.50:1 | Fails | Lc 15.1 | Dividers and decoration only |
| #37515F text on white | 8.38:1 | AAA | Lc 88.9 | Fine for body text |
| #37515F text on black | 2.50:1 | Fails | Lc -13.3 | 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
#D1DBE0
oklch(88.5% 0.013 228.9)
-
Step 300
300
#B3C4CD
oklch(81% 0.023 230.6)
-
Step 400
400
#8BA5B4
oklch(70.7% 0.036 233.3)
-
Step 500
500
#6D8FA1
oklch(63.1% 0.047 231.5)
-
Step 600
600
#55798C
oklch(55.6% 0.05 231.8)
-
Step 700
700
#456677
oklch(49.2% 0.047 231.4)
-
Step 800
800 (this color)
#37515F
oklch(42% 0.039 232.4)
-
Step 900
900
#31454F
oklch(37.8% 0.03 230.2)
-
Step 950
950
#1D282E
oklch(26.9% 0.019 232.2)
#37515F 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) | #4A5060 | 0.027 |
| Deuteranopia (no green cones) | #454C5F | 0.024 |
| Tritanopia (no blue cones) | #285555 | 0.030 |
| Achromatopsia (no color) | #4E4E4E | 0.039 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37515F
#37515F
oklch(42% 0.039 232.4)
- #5F4739
#5F4739
oklch(42% 0.04 51.5)
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 #37515F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.030
- Dark Grey Blue #29465B ΔE 0.041
- Deep Teal #00555A ΔE 0.042
- Charcoal #264653 ΔE 0.045
- YInMn Blue #415A77 ΔE 0.047
- Petrol #005F6A ΔE 0.050
- Dark Teal #014D4E ΔE 0.056
- Charcoal Grey #3C4142 ΔE 0.059
Use #37515F 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.