#243E59
Closest named color: Dark Blue Grey (#1F3B4D). oklch(35.6% 0.057 250.6), rgb(36, 62, 89).
Aa
White text reads best on this color (11.00:1).
About this color
#243E59 is a dark, muted blue. In OKLCH its lightness is 36%, its chroma 0.057 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.023 away. White text reads best on it, at 11.00:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | muted (0.057) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.90:1 |
| White text | 11.00:1 |
Values
| HEX | #243E59 |
| RGB | rgb(36, 62, 89) |
| HSL | hsl(211, 42%, 25%) |
| OKLCH | oklch(35.6% 0.057 250.6) |
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 #243E59 | 11.00:1 | AAA | Lc -99.2 | Preferred for body text |
| Black text on #243E59 | 1.90:1 | Fails | Lc 8.5 | Not readable |
| #243E59 text on white | 11.00:1 | AAA | Lc 95.4 | Preferred for body text |
| #243E59 text on black | 1.90:1 | Fails | Lc -7.3 | 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
#F3F6F9
oklch(97.2% 0.005 247.9)
-
Step 100
100
#E4EBF2
oklch(93.7% 0.012 248)
-
Step 200
200
#CEDBE9
oklch(88.6% 0.024 250.1)
-
Step 300
300
#ADC3DC
oklch(80.9% 0.043 251.7)
-
Step 400
400
#81A4CA
oklch(70.7% 0.068 250.9)
-
Step 500
500
#608DBD
oklch(63.1% 0.088 250.9)
-
Step 600
600
#4677A9
oklch(55.7% 0.095 250.3)
-
Step 700
700
#376491
oklch(49.2% 0.088 250)
-
Step 800
800
#2E5176
oklch(42.6% 0.074 251.2)
-
Step 900
900 (this color)
#243E59
oklch(35.6% 0.057 250.6)
-
Step 950
950
#192838
oklch(27.1% 0.036 250.8)
#243E59 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) | #333F5A | 0.021 |
| Deuteranopia (no green cones) | #2C3A58 | 0.015 |
| Tritanopia (no blue cones) | #024447 | 0.050 |
| Achromatopsia (no color) | #3C3C3C | 0.057 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #243E59
#243E59
oklch(35.6% 0.057 250.6)
- #4F3718
#4F3718
oklch(35.7% 0.057 71.2)
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 #243E59, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.023
- Dark Grey Blue #29465B ΔE 0.027
- Prussian Blue #1D3557 ΔE 0.031
- Charcoal #264653 ΔE 0.031
- Midnight Green #073B4C ΔE 0.037
- Onyx #343A40 ΔE 0.045
- Marine Blue #01386A ΔE 0.047
- Gunmetal #293241 ΔE 0.050
Use #243E59 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.