#374E5F
Closest named color: Dark Slate Gray (#2F4F4F). oklch(41.2% 0.04 240.9), rgb(55, 78, 95).
Aa
White text reads best on this color (8.68:1).
About this color
#374E5F is a dark, muted blue. In OKLCH its lightness is 41%, its chroma 0.040 and its hue 241°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.031 away. White text reads best on it, at 8.68:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | muted (0.040) |
| Temperature | cool |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.41:1 |
| White text | 8.68:1 |
Values
| HEX | #374E5F |
| RGB | rgb(55, 78, 95) |
| HSL | hsl(206, 27%, 29%) |
| OKLCH | oklch(41.2% 0.04 240.9) |
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 #374E5F | 8.68:1 | AAA | Lc -94.2 | Preferred for body text |
| Black text on #374E5F | 2.41:1 | Fails | Lc 14.2 | Not readable |
| #374E5F text on white | 8.68:1 | AAA | Lc 89.8 | Fine for body text |
| #374E5F text on black | 2.41:1 | Fails | Lc -12.5 | 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
#F4F6F7
oklch(97.2% 0.003 228.8)
-
Step 100
100
#E6EAEE
oklch(93.5% 0.007 247.9)
-
Step 200
200
#D2DAE1
oklch(88.4% 0.013 244.3)
-
Step 300
300
#B4C3CF
oklch(80.9% 0.024 242)
-
Step 400
400
#8CA4B6
oklch(70.6% 0.038 240.5)
-
Step 500
500
#708EA4
oklch(63.2% 0.047 240.3)
-
Step 600
600
#58788F
oklch(55.7% 0.051 240.1)
-
Step 700
700
#47657A
oklch(49.2% 0.049 239.5)
-
Step 800
800 (this color)
#374E5F
oklch(41.2% 0.04 240.9)
-
Step 900
900
#334451
oklch(37.7% 0.031 241.6)
-
Step 950
950
#1E282F
oklch(27% 0.019 238.9)
#374E5F 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) | #474E60 | 0.023 |
| Deuteranopia (no green cones) | #41495F | 0.020 |
| Tritanopia (no blue cones) | #285254 | 0.032 |
| Achromatopsia (no color) | #4B4B4B | 0.040 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #374E5F
#374E5F
oklch(41.2% 0.04 240.9)
- #5B4635
#5B4635
oklch(41.2% 0.039 60.4)
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 #374E5F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.031
- Dark Grey Blue #29465B ΔE 0.033
- Charcoal #264653 ΔE 0.039
- Deep Teal #00555A ΔE 0.046
- YInMn Blue #415A77 ΔE 0.051
- Charcoal Grey #3C4142 ΔE 0.054
- Dark Teal #014D4E ΔE 0.055
- Petrol #005F6A ΔE 0.057
Use #374E5F 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.