#374A5D
Closest named color: Dark Grey Blue (#29465B). oklch(40.1% 0.04 248.9), rgb(55, 74, 93).
Aa
White text reads best on this color (9.13:1).
About this color
#374A5D is a dark, muted blue. In OKLCH its lightness is 40%, its chroma 0.040 and its hue 249°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.023 away. White text reads best on it, at 9.13:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | muted (0.040) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.30:1 |
| White text | 9.13:1 |
Values
| HEX | #374A5D |
| RGB | rgb(55, 74, 93) |
| HSL | hsl(210, 26%, 29%) |
| OKLCH | oklch(40.1% 0.04 248.9) |
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 #374A5D | 9.13:1 | AAA | Lc -95.4 | Preferred for body text |
| Black text on #374A5D | 2.30:1 | Fails | Lc 13.0 | Not readable |
| #374A5D text on white | 9.13:1 | AAA | Lc 91.0 | Preferred for body text |
| #374A5D text on black | 2.30:1 | Fails | Lc -11.3 | 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 900.
-
Step 50
50
#F3F6F8
oklch(97.1% 0.004 236.5)
-
Step 100
100
#E5EAF0
oklch(93.5% 0.01 252.8)
-
Step 200
200
#D1DAE4
oklch(88.4% 0.017 250.9)
-
Step 300
300
#B2C3D4
oklch(81% 0.03 248.2)
-
Step 400
400
#8AA4BE
oklch(70.8% 0.048 248.5)
-
Step 500
500
#6C8DAE
oklch(63.1% 0.062 248.8)
-
Step 600
600
#547799
oklch(55.7% 0.067 248.4)
-
Step 700
700
#446483
oklch(49.2% 0.062 248.4)
-
Step 800
800
#38516A
oklch(42.6% 0.052 249.1)
-
Step 900
900 (this color)
#374A5D
oklch(40.1% 0.04 248.9)
-
Step 950
950
#1D2832
oklch(27.1% 0.024 246.3)
#374A5D 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) | #434A5E | 0.018 |
| Deuteranopia (no green cones) | #3E465D | 0.015 |
| Tritanopia (no blue cones) | #2A4E50 | 0.034 |
| Achromatopsia (no color) | #484848 | 0.040 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #374A5D
#374A5D
oklch(40.1% 0.04 248.9)
- #564430
#564430
oklch(40% 0.04 69.2)
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 #374A5D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.023
- Charcoal #264653 ΔE 0.031
- Dark Slate Gray #2F4F4F ΔE 0.035
- Charcoal Grey #3C4142 ΔE 0.046
- Deep Teal #00555A ΔE 0.052
- Dark Teal #014D4E ΔE 0.055
- YInMn Blue #415A77 ΔE 0.061
- Onyx #343A40 ΔE 0.062
Use #374A5D 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.