#374E70
Closest named color: YInMn Blue (#415A77). oklch(42.1% 0.064 258), rgb(55, 78, 112).
Aa
White text reads best on this color (8.44:1).
About this color
#374E70 is a dark, muted blue. In OKLCH its lightness is 42%, its chroma 0.064 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is YInMn Blue (#415A77), ΔE 0.040 away. White text reads best on it, at 8.44:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | muted (0.064) |
| Temperature | cool |
| Nearest name | YInMn Blue (#415A77) |
| Black text | 2.48:1 |
| White text | 8.44:1 |
Values
| HEX | #374E70 |
| RGB | rgb(55, 78, 112) |
| HSL | hsl(216, 34%, 33%) |
| OKLCH | oklch(42.1% 0.064 258) |
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 #374E70 | 8.44:1 | AAA | Lc -93.6 | Preferred for body text |
| Black text on #374E70 | 2.48:1 | Fails | Lc 15.0 | Not readable |
| #374E70 text on white | 8.44:1 | AAA | Lc 89.0 | Fine for body text |
| #374E70 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
#F3F6F9
oklch(97.2% 0.005 247.9)
-
Step 100
100
#E5EAF1
oklch(93.5% 0.011 256.7)
-
Step 200
200
#D1DAE7
oklch(88.5% 0.02 257.5)
-
Step 300
300
#B2C2D9
oklch(80.9% 0.037 257.4)
-
Step 400
400
#8AA2C6
oklch(70.7% 0.059 258.4)
-
Step 500
500
#6D8BB8
oklch(63.2% 0.076 258.3)
-
Step 600
600
#5474A4
oklch(55.5% 0.084 258.3)
-
Step 700
700
#45628C
oklch(49.2% 0.076 257.6)
-
Step 800
800 (this color)
#374E70
oklch(42.1% 0.064 258)
-
Step 900
900
#31425C
oklch(37.6% 0.05 258.7)
-
Step 950
950
#1D2736
oklch(27% 0.031 258.3)
#374E70 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) | #415071 | 0.016 |
| Deuteranopia (no green cones) | #3A4B6F | 0.009 |
| Tritanopia (no blue cones) | #1E555A | 0.056 |
| Achromatopsia (no color) | #4D4D4D | 0.064 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #374E70
#374E70
oklch(42.1% 0.064 258)
- #604922
#604922
oklch(42.1% 0.063 78.8)
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 #374E70, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- YInMn Blue #415A77 ΔE 0.040
- Light Navy #155084 ΔE 0.042
- Deep Sea Blue #015482 ΔE 0.045
- Dark Grey Blue #29465B ΔE 0.045
- Light Navy Blue #2E5A88 ΔE 0.047
- Dusk #4E5481 ΔE 0.047
- Dusk Blue #26538D ΔE 0.049
- Dusty Grape #545775 ΔE 0.052
Use #374E70 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.