#374656
Closest named color: Dark Grey Blue (#29465B). oklch(38.8% 0.033 250.3), rgb(55, 70, 86).
Aa
White text reads best on this color (9.66:1).
About this color
#374656 is a dark, muted blue. In OKLCH its lightness is 39%, its chroma 0.033 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.019 away. White text reads best on it, at 9.66:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | muted (0.033) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.17:1 |
| White text | 9.66:1 |
Values
| HEX | #374656 |
| RGB | rgb(55, 70, 86) |
| HSL | hsl(211, 22%, 28%) |
| OKLCH | oklch(38.8% 0.033 250.3) |
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 #374656 | 9.66:1 | AAA | Lc -96.6 | Preferred for body text |
| Black text on #374656 | 2.17:1 | Fails | Lc 11.6 | Not readable |
| #374656 text on white | 9.66:1 | AAA | Lc 92.4 | Preferred for body text |
| #374656 text on black | 2.17:1 | Fails | Lc -10.0 | 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 900.
-
Step 50
50
#F4F6F8
oklch(97.2% 0.003 247.9)
-
Step 100
100
#E6EAEF
oklch(93.5% 0.008 253.9)
-
Step 200
200
#D2DAE2
oklch(88.5% 0.014 248)
-
Step 300
300
#B5C2D1
oklch(80.9% 0.026 251.9)
-
Step 400
400
#8EA3B9
oklch(70.7% 0.04 249.6)
-
Step 500
500
#728CA8
oklch(63% 0.052 250.5)
-
Step 600
600
#5B7693
oklch(55.6% 0.055 250.6)
-
Step 700
700
#4A637D
oklch(49% 0.052 249.9)
-
Step 800
800
#3D5166
oklch(42.7% 0.043 250.1)
-
Step 900
900 (this color)
#374656
oklch(38.8% 0.033 250.3)
-
Step 950
950
#1F2731
oklch(27% 0.022 254.2)
#374656 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) | #404657 | 0.014 |
| Deuteranopia (no green cones) | #3C4356 | 0.011 |
| Tritanopia (no blue cones) | #2D4A4B | 0.030 |
| Achromatopsia (no color) | #444444 | 0.034 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #374656
#374656
oklch(38.8% 0.033 250.3)
- #504231
#504231
oklch(38.9% 0.033 72)
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 #374656, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.019
- Charcoal #264653 ΔE 0.023
- Charcoal Grey #3C4142 ΔE 0.033
- Dark Slate Gray #2F4F4F ΔE 0.036
- Onyx #343A40 ΔE 0.047
- Dark Blue Grey #1F3B4D ΔE 0.051
- Dark Teal #014D4E ΔE 0.053
- Deep Teal #00555A ΔE 0.058
Use #374656 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.