#223B73
Closest named color: Twilight Blue (#0A437A). oklch(36.5% 0.101 264), rgb(34, 59, 115).
Aa
White text reads best on this color (10.81:1).
About this color
#223B73 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.101 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.027 away. White text reads best on it, at 10.81:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.101) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.94:1 |
| White text | 10.81:1 |
Values
| HEX | #223B73 |
| RGB | rgb(34, 59, 115) |
| HSL | hsl(221, 54%, 29%) |
| OKLCH | oklch(36.5% 0.101 264) |
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 #223B73 | 10.81:1 | AAA | Lc -98.7 | Preferred for body text |
| Black text on #223B73 | 1.94:1 | Fails | Lc 9.1 | Not readable |
| #223B73 text on white | 10.81:1 | AAA | Lc 94.8 | Preferred for body text |
| #223B73 text on black | 1.94:1 | Fails | Lc -7.8 | 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
#F2F6FD
oklch(97.2% 0.01 261.8)
-
Step 100
100
#E2EAF9
oklch(93.5% 0.022 263.2)
-
Step 200
200
#CBDAF6
oklch(88.6% 0.042 263)
-
Step 300
300
#A8C1F3
oklch(81% 0.076 264)
-
Step 400
400
#7A9FEC
oklch(70.7% 0.121 264)
-
Step 500
500
#5885E6
oklch(63.1% 0.154 263.8)
-
Step 600
600
#3E6CD5
oklch(55.6% 0.169 263.9)
-
Step 700
700
#315AB8
oklch(49.2% 0.156 263.9)
-
Step 800
800
#294A95
oklch(42.8% 0.129 263.9)
-
Step 900
900 (this color)
#223B73
oklch(36.5% 0.101 264)
-
Step 950
950
#162546
oklch(27.1% 0.065 264.1)
#223B73 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) | #1F4175 | 0.017 |
| Deuteranopia (no green cones) | #0E3A72 | 0.018 |
| Tritanopia (no blue cones) | #004851 | 0.083 |
| Achromatopsia (no color) | #3D3D3D | 0.101 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #223B73
#223B73
oklch(36.5% 0.101 264)
- #513A00
#513A00
oklch(36.5% 0.075 83.5)
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 #223B73, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.027
- Marine Blue #01386A ΔE 0.033
- Prussian Blue #1D3557 ΔE 0.051
- Cobalt #1E488F ΔE 0.056
- Marine #042E60 ΔE 0.059
- Dark Grey Blue #29465B ΔE 0.060
- Light Navy #155084 ΔE 0.063
- Dark Blue Grey #1F3B4D ΔE 0.068
Use #223B73 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.