#374458
Closest named color: Dark Grey Blue (#29465B). oklch(38.4% 0.038 258.9), rgb(55, 68, 88).
Aa
White text reads best on this color (9.85:1).
About this color
#374458 is a dark, muted blue. In OKLCH its lightness is 38%, its chroma 0.038 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.018 away. White text reads best on it, at 9.85:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | muted (0.038) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.13:1 |
| White text | 9.85:1 |
Values
| HEX | #374458 |
| RGB | rgb(55, 68, 88) |
| HSL | hsl(216, 23%, 28%) |
| OKLCH | oklch(38.4% 0.038 258.9) |
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 #374458 | 9.85:1 | AAA | Lc -97.0 | Preferred for body text |
| Black text on #374458 | 2.13:1 | Fails | Lc 11.1 | Not readable |
| #374458 text on white | 9.85:1 | AAA | Lc 92.9 | Preferred for body text |
| #374458 text on black | 2.13:1 | Fails | Lc -9.6 | 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
#F4F5F8
oklch(97% 0.004 271.4)
-
Step 100
100
#E6EAEF
oklch(93.5% 0.008 253.9)
-
Step 200
200
#D3DAE4
oklch(88.6% 0.016 257.2)
-
Step 300
300
#B6C1D4
oklch(80.8% 0.029 261.5)
-
Step 400
400
#90A2BE
oklch(70.8% 0.046 259.2)
-
Step 500
500
#748BAD
oklch(63.1% 0.058 258)
-
Step 600
600
#5D7499
oklch(55.5% 0.064 259.7)
-
Step 700
700
#4C6283
oklch(49.2% 0.06 258.3)
-
Step 800
800
#3F506A
oklch(42.8% 0.048 258.7)
-
Step 900
900 (this color)
#374458
oklch(38.4% 0.038 258.9)
-
Step 950
950
#1F2732
oklch(27% 0.024 256.4)
#374458 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) | #3D4559 | 0.010 |
| Deuteranopia (no green cones) | #394258 | 0.007 |
| Tritanopia (no blue cones) | #2D484B | 0.033 |
| Achromatopsia (no color) | #434343 | 0.038 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #374458
#374458
oklch(38.4% 0.038 258.9)
- #4E412C
#4E412C
oklch(38.3% 0.038 79.2)
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 #374458, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.018
- Charcoal #264653 ΔE 0.025
- Charcoal Grey #3C4142 ΔE 0.036
- Dark Slate Gray #2F4F4F ΔE 0.044
- Onyx #343A40 ΔE 0.046
- Dark Blue Grey #1F3B4D ΔE 0.048
- Dark Teal #014D4E ΔE 0.058
- Prussian Blue #1D3557 ΔE 0.063
Use #374458 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.