#374A5E
Closest named color: Dark Grey Blue (#29465B). oklch(40.2% 0.042 250.2), rgb(55, 74, 94).
Aa
White text reads best on this color (9.11:1).
About this color
#374A5E is a dark, muted blue. In OKLCH its lightness is 40%, its chroma 0.042 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.024 away. White text reads best on it, at 9.11:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | muted (0.042) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.30:1 |
| White text | 9.11:1 |
Values
| HEX | #374A5E |
| RGB | rgb(55, 74, 94) |
| HSL | hsl(211, 26%, 29%) |
| OKLCH | oklch(40.2% 0.042 250.2) |
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 #374A5E | 9.11:1 | AAA | Lc -95.3 | Preferred for body text |
| Black text on #374A5E | 2.30:1 | Fails | Lc 13.0 | Not readable |
| #374A5E text on white | 9.11:1 | AAA | Lc 91.0 | Preferred for body text |
| #374A5E text on black | 2.30:1 | Fails | Lc -11.4 | 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
#8AA4BF
oklch(70.8% 0.049 249.5)
-
Step 500
500
#6C8DAF
oklch(63.1% 0.064 249.6)
-
Step 600
600
#54769B
oklch(55.5% 0.07 251.2)
-
Step 700
700
#446384
oklch(49% 0.065 250.8)
-
Step 800
800
#38516B
oklch(42.6% 0.053 250.1)
-
Step 900
900 (this color)
#374A5E
oklch(40.2% 0.042 250.2)
-
Step 950
950
#1D2833
oklch(27.2% 0.026 248.8)
#374A5E 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) | #424A5F | 0.016 |
| Deuteranopia (no green cones) | #3E465E | 0.015 |
| Tritanopia (no blue cones) | #2A4F51 | 0.036 |
| Achromatopsia (no color) | #484848 | 0.042 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #374A5E
#374A5E
oklch(40.2% 0.042 250.2)
- #57442F
#57442F
oklch(40.1% 0.042 69)
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 #374A5E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.024
- Charcoal #264653 ΔE 0.032
- Dark Slate Gray #2F4F4F ΔE 0.036
- Charcoal Grey #3C4142 ΔE 0.048
- Deep Teal #00555A ΔE 0.053
- Dark Teal #014D4E ΔE 0.056
- YInMn Blue #415A77 ΔE 0.060
- Onyx #343A40 ΔE 0.063
Use #374A5E 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.