#2C437E
Closest named color: Twilight Blue (#0A437A). oklch(39.7% 0.104 265.8), rgb(44, 67, 126).
Aa
White text reads best on this color (9.49:1).
About this color
#2C437E is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.104 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.029 away. White text reads best on it, at 9.49:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.104) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.21:1 |
| White text | 9.49:1 |
Values
| HEX | #2C437E |
| RGB | rgb(44, 67, 126) |
| HSL | hsl(223, 48%, 33%) |
| OKLCH | oklch(39.7% 0.104 265.8) |
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 #2C437E | 9.49:1 | AAA | Lc -96.0 | Preferred for body text |
| Black text on #2C437E | 2.21:1 | Fails | Lc 12.2 | Not readable |
| #2C437E text on white | 9.49:1 | AAA | Lc 91.7 | Preferred for body text |
| #2C437E text on black | 2.21:1 | Fails | Lc -10.6 | 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
#F2F5FD
oklch(97% 0.011 269.6)
-
Step 100
100
#E3EAF9
oklch(93.6% 0.022 265.8)
-
Step 200
200
#CCD9F7
oklch(88.5% 0.044 266.9)
-
Step 300
300
#A9C0F4
oklch(80.9% 0.078 266.1)
-
Step 400
400
#7C9EEE
oklch(70.7% 0.124 265.8)
-
Step 500
500
#5B83E9
oklch(63% 0.16 265.9)
-
Step 600
600
#436AD7
oklch(55.5% 0.173 266.1)
-
Step 700
700
#3558BA
oklch(49.1% 0.16 265.9)
-
Step 800
800
#2C4997
oklch(42.8% 0.133 265.7)
-
Step 900
900 (this color)
#2C437E
oklch(39.7% 0.104 265.8)
-
Step 950
950
#172446
oklch(26.9% 0.066 266.3)
#2C437E 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) | #274A80 | 0.020 |
| Deuteranopia (no green cones) | #19427D | 0.020 |
| Tritanopia (no blue cones) | #00505A | 0.087 |
| Achromatopsia (no color) | #464646 | 0.104 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2C437E
#2C437E
oklch(39.7% 0.104 265.8)
- #5A4300
#5A4300
oklch(39.7% 0.081 86.3)
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 #2C437E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.029
- Cobalt #1E488F ΔE 0.031
- Light Navy #155084 ΔE 0.039
- Dusk Blue #26538D ΔE 0.048
- Dark Slate Blue #483D8B ΔE 0.049
- Deep Sea Blue #015482 ΔE 0.052
- Blueberry #464196 ΔE 0.055
- Marine Blue #01386A ΔE 0.062
Use #2C437E 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.