#374F69
Closest named color: Dark Grey Blue (#29465B). oklch(42% 0.053 251.1), rgb(55, 79, 105).
Aa
White text reads best on this color (8.45:1).
About this color
#374F69 is a dark, muted blue. In OKLCH its lightness is 42%, its chroma 0.053 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.040 away. White text reads best on it, at 8.45:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | muted (0.053) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.48:1 |
| White text | 8.45:1 |
Values
| HEX | #374F69 |
| RGB | rgb(55, 79, 105) |
| HSL | hsl(211, 31%, 31%) |
| OKLCH | oklch(42% 0.053 251.1) |
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 #374F69 | 8.45:1 | AAA | Lc -93.6 | Preferred for body text |
| Black text on #374F69 | 2.48:1 | Fails | Lc 14.9 | Not readable |
| #374F69 text on white | 8.45:1 | AAA | Lc 89.1 | Fine for body text |
| #374F69 text on black | 2.48:1 | Fails | Lc -13.2 | 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
#E6EAF0
oklch(93.6% 0.009 258.3)
-
Step 200
200
#D1DAE4
oklch(88.4% 0.017 250.9)
-
Step 300
300
#B2C2D4
oklch(80.8% 0.031 251.3)
-
Step 400
400
#8AA3BF
oklch(70.6% 0.05 251.4)
-
Step 500
500
#6D8DAF
oklch(63.2% 0.063 250.4)
-
Step 600
600
#55769A
oklch(55.5% 0.068 251.2)
-
Step 700
700
#456384
oklch(49% 0.064 251.5)
-
Step 800
800 (this color)
#374F69
oklch(42% 0.053 251.1)
-
Step 900
900
#314357
oklch(37.6% 0.041 251.6)
-
Step 950
950
#1D2733
oklch(26.9% 0.027 253.3)
#374F69 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) | #45506A | 0.020 |
| Deuteranopia (no green cones) | #3F4B68 | 0.015 |
| Tritanopia (no blue cones) | #235558 | 0.045 |
| Achromatopsia (no color) | #4D4D4D | 0.053 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #374F69
#374F69
oklch(42% 0.053 251.1)
- #5F482C
#5F482C
oklch(41.9% 0.052 71.1)
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 #374F69, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.040
- YInMn Blue #415A77 ΔE 0.041
- Dark Slate Gray #2F4F4F ΔE 0.047
- Charcoal #264653 ΔE 0.050
- Deep Sea Blue #015482 ΔE 0.051
- Light Navy #155084 ΔE 0.052
- Dusty Grape #545775 ΔE 0.053
- Light Navy Blue #2E5A88 ΔE 0.054
Use #374F69 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.