#242C5B
Closest named color: Prussian Blue (#1D3557). oklch(31.3% 0.084 273.3), rgb(36, 44, 91).
Aa
White text reads best on this color (13.23:1).
About this color
#242C5B is a dark, moderately saturated blue. In OKLCH its lightness is 31%, its chroma 0.084 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.030 away. White text reads best on it, at 13.23:1.
| Hue family | Blues |
| Lightness | dark (31%) |
| Chroma | moderately saturated (0.084) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.58:1 |
| White text | 13.23:1 |
Values
| HEX | #242C5B |
| RGB | rgb(36, 44, 91) |
| HSL | hsl(231, 43%, 25%) |
| OKLCH | oklch(31.3% 0.084 273.3) |
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 #242C5B | 13.23:1 | AAA | Lc -102.7 | Preferred for body text |
| Black text on #242C5B | 1.58:1 | Fails | Lc 0.0 | Not readable |
| #242C5B text on white | 13.23:1 | AAA | Lc 99.4 | Preferred for body text |
| #242C5B text on black | 1.58:1 | 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
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E3E9FE
oklch(93.6% 0.029 273.1)
-
Step 200
200
#CDD7FF
oklch(88.4% 0.056 274.2)
-
Step 300
300
#ACBDFF
oklch(80.9% 0.095 273)
-
Step 400
400
#8397FF
oklch(70.7% 0.153 273.6)
-
Step 500
500
#6679FF
oklch(63.1% 0.198 273.3)
-
Step 600
600
#505CF1
oklch(55.6% 0.22 273.3)
-
Step 700
700
#424AD2
oklch(49.1% 0.205 273.4)
-
Step 800
800
#363EAA
oklch(42.8% 0.17 273.5)
-
Step 900
900
#2D3686
oklch(37.6% 0.133 273.3)
-
Step 950
950 (this color)
#242C5B
oklch(31.3% 0.084 273.3)
#242C5B 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) | #16325D | 0.023 |
| Deuteranopia (no green cones) | #0E2E5A | 0.025 |
| Tritanopia (no blue cones) | #05363F | 0.073 |
| Achromatopsia (no color) | #303030 | 0.084 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #242C5B
#242C5B
oklch(31.3% 0.084 273.3)
- #3C3000
#3C3000
oklch(31.3% 0.064 93.7)
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 #242C5B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.030
- Marine #042E60 ΔE 0.032
- Marine Blue #01386A ΔE 0.046
- Space Cadet #2B2D42 ΔE 0.047
- Gunmetal #293241 ΔE 0.055
- Dark Blue Grey #1F3B4D ΔE 0.059
- Oxford Blue #1B263B ΔE 0.061
- Midnight Green #073B4C ΔE 0.064
Use #242C5B 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.