#374F64
Closest named color: Dark Grey Blue (#29465B). oklch(41.7% 0.046 245.6), rgb(55, 79, 100).
Aa
White text reads best on this color (8.51:1).
About this color
#374F64 is a dark, muted blue. In OKLCH its lightness is 42%, its chroma 0.046 and its hue 246°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.037 away. White text reads best on it, at 8.51:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | muted (0.046) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.46:1 |
| White text | 8.51:1 |
Values
| HEX | #374F64 |
| RGB | rgb(55, 79, 100) |
| HSL | hsl(208, 29%, 30%) |
| OKLCH | oklch(41.7% 0.046 245.6) |
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 #374F64 | 8.51:1 | AAA | Lc -93.8 | Preferred for body text |
| Black text on #374F64 | 2.46:1 | Fails | Lc 14.7 | Not readable |
| #374F64 text on white | 8.51:1 | AAA | Lc 89.3 | Fine for body text |
| #374F64 text on black | 2.46:1 | Fails | Lc -13.0 | 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 800.
-
Step 50
50
#F3F6F8
oklch(97.1% 0.004 236.5)
-
Step 100
100
#E6EAEF
oklch(93.5% 0.008 253.9)
-
Step 200
200
#D1DAE3
oklch(88.4% 0.016 248)
-
Step 300
300
#B3C3D1
oklch(80.9% 0.026 244.5)
-
Step 400
400
#8BA4BA
oklch(70.7% 0.043 245)
-
Step 500
500
#6E8DA9
oklch(63% 0.055 246.1)
-
Step 600
600
#567794
oklch(55.6% 0.059 245.7)
-
Step 700
700
#46647F
oklch(49.1% 0.056 246.4)
-
Step 800
800 (this color)
#374F64
oklch(41.7% 0.046 245.6)
-
Step 900
900
#324454
oklch(37.8% 0.036 245.8)
-
Step 950
950
#1D2831
oklch(27.1% 0.023 243.4)
#374F64 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) | #464F65 | 0.021 |
| Deuteranopia (no green cones) | #414A64 | 0.020 |
| Tritanopia (no blue cones) | #265456 | 0.038 |
| Achromatopsia (no color) | #4D4D4D | 0.046 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #374F64
#374F64
oklch(41.7% 0.046 245.6)
- #5E4731
#5E4731
oklch(41.7% 0.046 64.7)
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 #374F64, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.037
- Dark Slate Gray #2F4F4F ΔE 0.039
- Charcoal #264653 ΔE 0.044
- YInMn Blue #415A77 ΔE 0.045
- Deep Teal #00555A ΔE 0.049
- Petrol #005F6A ΔE 0.056
- Dusty Grape #545775 ΔE 0.057
- Deep Sea Blue #015482 ΔE 0.057
Use #374F64 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.