#223579
Closest named color: Marine Blue (#01386A). oklch(35.6% 0.118 268.1), rgb(34, 53, 121).
Aa
White text reads best on this color (11.33:1).
About this color
#223579 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.118 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.038 away. White text reads best on it, at 11.33:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.118) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.85:1 |
| White text | 11.33:1 |
Values
| HEX | #223579 |
| RGB | rgb(34, 53, 121) |
| HSL | hsl(227, 56%, 30%) |
| OKLCH | oklch(35.6% 0.118 268.1) |
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 #223579 | 11.33:1 | AAA | Lc -99.6 | Preferred for body text |
| Black text on #223579 | 1.85:1 | Fails | Lc 8.1 | Not readable |
| #223579 text on white | 11.33:1 | AAA | Lc 95.8 | Preferred for body text |
| #223579 text on black | 1.85:1 | 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
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E2EAFC
oklch(93.6% 0.026 266.6)
-
Step 200
200
#CBD9FB
oklch(88.6% 0.049 267.7)
-
Step 300
300
#A8BFFB
oklch(80.9% 0.089 268.2)
-
Step 400
400
#7B9BF9
oklch(70.6% 0.143 268.4)
-
Step 500
500
#5B7FF6
oklch(63.1% 0.182 268.2)
-
Step 600
600
#4365E5
oklch(55.6% 0.198 268)
-
Step 700
700
#3653C7
oklch(49.2% 0.183 268.1)
-
Step 800
800
#2C45A1
oklch(42.8% 0.152 267.9)
-
Step 900
900 (this color)
#223579
oklch(35.6% 0.118 268.1)
-
Step 950
950
#17234B
oklch(27% 0.076 268.4)
#223579 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) | #023E7B | 0.030 |
| Deuteranopia (no green cones) | #003678 | 0.026 |
| Tritanopia (no blue cones) | #004551 | 0.096 |
| Achromatopsia (no color) | #3A3A3A | 0.119 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #223579
#223579
oklch(35.6% 0.118 268.1)
- #4C3900
#4C3900
oklch(35.6% 0.073 87.6)
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 #223579, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.038
- Twilight Blue #0A437A ΔE 0.040
- Marine #042E60 ΔE 0.057
- Prussian Blue #1D3557 ΔE 0.060
- Cobalt #1E488F ΔE 0.061
- Dark Slate Blue #483D8B ΔE 0.070
- Midnight Blue #191970 ΔE 0.073
- Light Navy #155084 ΔE 0.077
Use #223579 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.