#374277
Closest named color: Twilight Blue (#0A437A). oklch(39.7% 0.09 272.8), rgb(55, 66, 119).
Aa
White text reads best on this color (9.51:1).
About this color
#374277 is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.090 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.042 away. White text reads best on it, at 9.51:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.090) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.20:1 |
| White text | 9.51:1 |
Values
| HEX | #374277 |
| RGB | rgb(55, 66, 119) |
| HSL | hsl(230, 37%, 34%) |
| OKLCH | oklch(39.7% 0.09 272.8) |
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 #374277 | 9.51:1 | AAA | Lc -96.1 | Preferred for body text |
| Black text on #374277 | 2.20:1 | Fails | Lc 12.1 | Not readable |
| #374277 text on white | 9.51:1 | AAA | Lc 91.9 | Preferred for body text |
| #374277 text on black | 2.20:1 | Fails | Lc -10.5 | 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 900.
-
Step 50
50
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E5E9F7
oklch(93.5% 0.019 273.2)
-
Step 200
200
#D0D8F3
oklch(88.5% 0.038 272.5)
-
Step 300
300
#B2BEED
oklch(80.8% 0.068 273.6)
-
Step 400
400
#8A9CE4
oklch(70.7% 0.108 272.7)
-
Step 500
500
#6E81DD
oklch(63% 0.14 273)
-
Step 600
600
#5769CA
oklch(55.6% 0.15 272.7)
-
Step 700
700
#4857AF
oklch(49.1% 0.14 272.9)
-
Step 800
800
#3B488E
oklch(42.8% 0.116 272.7)
-
Step 900
900 (this color)
#374277
oklch(39.7% 0.09 272.8)
-
Step 950
950
#1D2442
oklch(27% 0.057 272.2)
#374277 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) | #2C4879 | 0.020 |
| Deuteranopia (no green cones) | #254376 | 0.022 |
| Tritanopia (no blue cones) | #1B4D56 | 0.080 |
| Achromatopsia (no color) | #464646 | 0.090 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #374277
#374277
oklch(39.7% 0.09 272.8)
- #564500
#564500
oklch(39.7% 0.081 92.8)
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 #374277, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.042
- Dark Slate Blue #483D8B ΔE 0.046
- Cobalt #1E488F ΔE 0.047
- Light Navy #155084 ΔE 0.049
- Dusk Blue #26538D ΔE 0.056
- Dark Grey Blue #29465B ΔE 0.057
- Blueberry #464196 ΔE 0.057
- Deep Sea Blue #015482 ΔE 0.060
Use #374277 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.