#2F387F
Closest named color: Twilight Blue (#0A437A). oklch(37.5% 0.119 273.8), rgb(47, 56, 127).
Aa
White text reads best on this color (10.53:1).
About this color
#2F387F is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.119 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.043 away. White text reads best on it, at 10.53:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.119) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.99:1 |
| White text | 10.53:1 |
Values
| HEX | #2F387F |
| RGB | rgb(47, 56, 127) |
| HSL | hsl(233, 46%, 34%) |
| OKLCH | oklch(37.5% 0.119 273.8) |
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 #2F387F | 10.53:1 | AAA | Lc -98.2 | Preferred for body text |
| Black text on #2F387F | 1.99:1 | Fails | Lc 9.8 | Not readable |
| #2F387F text on white | 10.53:1 | AAA | Lc 94.2 | Preferred for body text |
| #2F387F text on black | 1.99:1 | Fails | Lc -8.4 | 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
#F3F5FE
oklch(97.1% 0.012 276.1)
-
Step 100
100
#E4E9FC
oklch(93.6% 0.026 274.1)
-
Step 200
200
#CED8FB
oklch(88.6% 0.049 272.8)
-
Step 300
300
#AEBDFB
oklch(80.9% 0.089 273.7)
-
Step 400
400
#8598F9
oklch(70.7% 0.143 273.8)
-
Step 500
500
#697BF6
oklch(63.1% 0.183 273.7)
-
Step 600
600
#5360E5
oklch(55.5% 0.199 273.7)
-
Step 700
700
#444EC7
oklch(49% 0.186 273.7)
-
Step 800
800
#3841A1
oklch(42.7% 0.154 273.9)
-
Step 900
900 (this color)
#2F387F
oklch(37.5% 0.119 273.8)
-
Step 950
950
#1C224B
oklch(27.1% 0.076 274)
#2F387F 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) | #084381 | 0.041 |
| Deuteranopia (no green cones) | #003C7E | 0.039 |
| Tritanopia (no blue cones) | #004956 | 0.102 |
| Achromatopsia (no color) | #3F3F3F | 0.119 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2F387F
#2F387F
oklch(37.5% 0.119 273.8)
- #4F4000
#4F4000
oklch(37.6% 0.077 93.9)
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 #2F387F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.043
- Dark Slate Blue #483D8B ΔE 0.047
- Cobalt #1E488F ΔE 0.049
- Marine Blue #01386A ΔE 0.057
- Blueberry #464196 ΔE 0.058
- Light Navy #155084 ΔE 0.068
- Sapphire #2138AB ΔE 0.074
- Prussian Blue #1D3557 ΔE 0.075
Use #2F387F 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.