#374F62
Closest named color: Dark Slate Gray (#2F4F4F). oklch(41.6% 0.043 242.9), rgb(55, 79, 98).
Aa
White text reads best on this color (8.54:1).
About this color
#374F62 is a dark, muted blue. In OKLCH its lightness is 42%, its chroma 0.043 and its hue 243°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.035 away. White text reads best on it, at 8.54:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | muted (0.043) |
| Temperature | cool |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.45:1 |
| White text | 8.54:1 |
Values
| HEX | #374F62 |
| RGB | rgb(55, 79, 98) |
| HSL | hsl(207, 28%, 30%) |
| OKLCH | oklch(41.6% 0.043 242.9) |
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 #374F62 | 8.54:1 | AAA | Lc -93.9 | Preferred for body text |
| Black text on #374F62 | 2.45:1 | Fails | Lc 14.6 | Not readable |
| #374F62 text on white | 8.54:1 | AAA | Lc 89.3 | Fine for body text |
| #374F62 text on black | 2.45:1 | Fails | Lc -12.9 | 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
#E6EAEE
oklch(93.5% 0.007 247.9)
-
Step 200
200
#D1DAE2
oklch(88.4% 0.015 244.7)
-
Step 300
300
#B3C3D0
oklch(80.9% 0.025 242.4)
-
Step 400
400
#8BA4B8
oklch(70.6% 0.041 242.4)
-
Step 500
500
#6E8EA7
oklch(63.2% 0.052 242.1)
-
Step 600
600
#567892
oklch(55.7% 0.056 241.9)
-
Step 700
700
#46647C
oklch(49% 0.052 243.2)
-
Step 800
800 (this color)
#374F62
oklch(41.6% 0.043 242.9)
-
Step 900
900
#324452
oklch(37.7% 0.033 242.1)
-
Step 950
950
#1D2830
oklch(27% 0.021 240.1)
#374F62 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) | #474F63 | 0.023 |
| Deuteranopia (no green cones) | #414A62 | 0.020 |
| Tritanopia (no blue cones) | #275455 | 0.036 |
| Achromatopsia (no color) | #4C4C4C | 0.043 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #374F62
#374F62
oklch(41.6% 0.043 242.9)
- #5D4733
#5D4733
oklch(41.6% 0.043 63.5)
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 #374F62, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.035
- Dark Grey Blue #29465B ΔE 0.036
- Charcoal #264653 ΔE 0.043
- YInMn Blue #415A77 ΔE 0.046
- Deep Teal #00555A ΔE 0.047
- Petrol #005F6A ΔE 0.055
- Dusty Grape #545775 ΔE 0.058
- Dark Teal #014D4E ΔE 0.059
Use #374F62 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.