#243D5B
Closest named color: Dark Blue Grey (#1F3B4D). oklch(35.5% 0.061 253.8), rgb(36, 61, 91).
Aa
White text reads best on this color (11.09:1).
About this color
#243D5B is a dark, muted blue. In OKLCH its lightness is 35%, its chroma 0.061 and its hue 254°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.026 away. White text reads best on it, at 11.09:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | muted (0.061) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.89:1 |
| White text | 11.09:1 |
Values
| HEX | #243D5B |
| RGB | rgb(36, 61, 91) |
| HSL | hsl(213, 43%, 25%) |
| OKLCH | oklch(35.5% 0.061 253.8) |
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 #243D5B | 11.09:1 | AAA | Lc -99.4 | Preferred for body text |
| Black text on #243D5B | 1.89:1 | Fails | Lc 8.4 | Not readable |
| #243D5B text on white | 11.09:1 | AAA | Lc 95.5 | Preferred for body text |
| #243D5B text on black | 1.89:1 | 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 900.
-
Step 50
50
#F3F6FA
oklch(97.2% 0.006 255.5)
-
Step 100
100
#E4EBF3
oklch(93.7% 0.013 251.6)
-
Step 200
200
#CEDAEA
oklch(88.4% 0.026 255.6)
-
Step 300
300
#ADC3DE
oklch(80.9% 0.045 253.6)
-
Step 400
400
#81A3CE
oklch(70.6% 0.074 254.6)
-
Step 500
500
#608CC1
oklch(63% 0.094 253.7)
-
Step 600
600
#4776AE
oklch(55.8% 0.102 253.8)
-
Step 700
700
#386295
oklch(49% 0.095 254.3)
-
Step 800
800
#2F5179
oklch(42.8% 0.078 253.5)
-
Step 900
900 (this color)
#243D5B
oklch(35.5% 0.061 253.8)
-
Step 950
950
#192739
oklch(26.9% 0.039 255.1)
#243D5B 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) | #313F5C | 0.019 |
| Deuteranopia (no green cones) | #2A395A | 0.014 |
| Tritanopia (no blue cones) | #004448 | 0.053 |
| Achromatopsia (no color) | #3C3C3C | 0.061 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #243D5B
#243D5B
oklch(35.5% 0.061 253.8)
- #4F3613
#4F3613
oklch(35.4% 0.061 72.5)
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 #243D5B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.026
- Prussian Blue #1D3557 ΔE 0.028
- Dark Grey Blue #29465B ΔE 0.031
- Charcoal #264653 ΔE 0.037
- Midnight Green #073B4C ΔE 0.039
- Marine Blue #01386A ΔE 0.043
- Onyx #343A40 ΔE 0.049
- Gunmetal #293241 ΔE 0.051
Use #243D5B 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.