#2F397C
Closest named color: Twilight Blue (#0A437A). oklch(37.5% 0.113 273.3), rgb(47, 57, 124).
Aa
White text reads best on this color (10.51:1).
About this color
#2F397C is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.113 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.040 away. White text reads best on it, at 10.51:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.113) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.99:1 |
| White text | 10.51:1 |
Values
| HEX | #2F397C |
| RGB | rgb(47, 57, 124) |
| HSL | hsl(232, 45%, 34%) |
| OKLCH | oklch(37.5% 0.113 273.3) |
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 #2F397C | 10.51:1 | AAA | Lc -98.1 | Preferred for body text |
| Black text on #2F397C | 1.99:1 | Fails | Lc 9.8 | Not readable |
| #2F397C text on white | 10.51:1 | AAA | Lc 94.1 | Preferred for body text |
| #2F397C 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
#F3F5FD
oklch(97.1% 0.011 274.9)
-
Step 100
100
#E4E9FB
oklch(93.6% 0.025 273.5)
-
Step 200
200
#CFD8F9
oklch(88.6% 0.047 273.4)
-
Step 300
300
#AEBDF8
oklch(80.8% 0.085 273.3)
-
Step 400
400
#8599F5
oklch(70.6% 0.136 273.2)
-
Step 500
500
#697DF1
oklch(63.1% 0.174 273.1)
-
Step 600
600
#5363DF
oklch(55.6% 0.188 273.1)
-
Step 700
700
#4451C2
oklch(49.1% 0.175 273.1)
-
Step 800
800
#38439D
oklch(42.7% 0.145 273.3)
-
Step 900
900 (this color)
#2F397C
oklch(37.5% 0.113 273.3)
-
Step 950
950
#1C2249
oklch(27% 0.072 274)
#2F397C 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) | #12437E | 0.036 |
| Deuteranopia (no green cones) | #003C7B | 0.039 |
| Tritanopia (no blue cones) | #004854 | 0.098 |
| Achromatopsia (no color) | #3F3F3F | 0.114 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2F397C
#2F397C
oklch(37.5% 0.113 273.3)
- #4F3F00
#4F3F00
oklch(37.4% 0.077 92.6)
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 #2F397C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.040
- Dark Slate Blue #483D8B ΔE 0.049
- Cobalt #1E488F ΔE 0.049
- Marine Blue #01386A ΔE 0.054
- Blueberry #464196 ΔE 0.060
- Light Navy #155084 ΔE 0.066
- Prussian Blue #1D3557 ΔE 0.070
- Dusk Blue #26538D ΔE 0.075
Use #2F397C 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.