#242B57
Closest named color: Prussian Blue (#1D3557). oklch(30.8% 0.079 274), rgb(36, 43, 87).
Aa
White text reads best on this color (13.47:1).
About this color
#242B57 is a dark, moderately saturated blue. In OKLCH its lightness is 31%, its chroma 0.079 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.031 away. White text reads best on it, at 13.47:1.
| Hue family | Blues |
| Lightness | dark (31%) |
| Chroma | moderately saturated (0.079) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.55:1 |
| White text | 13.47:1 |
Values
| HEX | #242B57 |
| RGB | rgb(36, 43, 87) |
| HSL | hsl(232, 41%, 24%) |
| OKLCH | oklch(30.8% 0.079 274) |
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 #242B57 | 13.47:1 | AAA | Lc -103.0 | Preferred for body text |
| Black text on #242B57 | 1.55:1 | Fails | Lc 0.0 | Not readable |
| #242B57 text on white | 13.47:1 | AAA | Lc 99.8 | Preferred for body text |
| #242B57 text on black | 1.55:1 | Fails | Lc 0.0 | 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 950.
-
Step 50
50
#F3F5FE
oklch(97.1% 0.012 276.1)
-
Step 100
100
#E4E9FD
oklch(93.6% 0.028 274.7)
-
Step 200
200
#CED7FC
oklch(88.4% 0.052 274.5)
-
Step 300
300
#AEBDFE
oklch(81% 0.094 274.1)
-
Step 400
400
#8497FD
oklch(70.6% 0.15 274)
-
Step 500
500
#6979FB
oklch(63.1% 0.192 274.2)
-
Step 600
600
#535EEA
oklch(55.6% 0.208 274)
-
Step 700
700
#444CCB
oklch(49% 0.193 274)
-
Step 800
800
#3840A4
oklch(42.8% 0.159 274)
-
Step 900
900
#2F3882
oklch(37.8% 0.124 273.7)
-
Step 950
950 (this color)
#242B57
oklch(30.8% 0.079 274)
#242B57 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) | #173159 | 0.022 |
| Deuteranopia (no green cones) | #112C56 | 0.024 |
| Tritanopia (no blue cones) | #0B353C | 0.071 |
| Achromatopsia (no color) | #2F2F2F | 0.079 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #242B57
#242B57
oklch(30.8% 0.079 274)
- #3A2F00
#3A2F00
oklch(30.8% 0.063 94.9)
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 #242B57, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.031
- Marine #042E60 ΔE 0.034
- Space Cadet #2B2D42 ΔE 0.042
- Gunmetal #293241 ΔE 0.051
- Marine Blue #01386A ΔE 0.052
- Oxford Blue #1B263B ΔE 0.054
- Dark Blue Grey #1F3B4D ΔE 0.058
- Midnight Green #073B4C ΔE 0.063
Use #242B57 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.