#223D87
Closest named color: Cobalt (#1E488F). oklch(38.5% 0.128 265.6), rgb(34, 61, 135).
Aa
White text reads best on this color (10.07:1).
About this color
#223D87 is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.128 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.032 away. White text reads best on it, at 10.07:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.128) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.08:1 |
| White text | 10.07:1 |
Values
| HEX | #223D87 |
| RGB | rgb(34, 61, 135) |
| HSL | hsl(224, 60%, 33%) |
| OKLCH | oklch(38.5% 0.128 265.6) |
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 #223D87 | 10.07:1 | AAA | Lc -97.1 | Preferred for body text |
| Black text on #223D87 | 2.08:1 | Fails | Lc 11.0 | Not readable |
| #223D87 text on white | 10.07:1 | AAA | Lc 93.0 | Preferred for body text |
| #223D87 text on black | 2.08:1 | Fails | Lc -9.5 | 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
#F1F5FE
oklch(97% 0.013 266.7)
-
Step 100
100
#E1EAFD
oklch(93.6% 0.028 265.4)
-
Step 200
200
#C8D9FE
oklch(88.5% 0.054 265.8)
-
Step 300
300
#A3C0FF
oklch(80.9% 0.095 265.2)
-
Step 400
400
#739CFF
oklch(70.7% 0.152 265.7)
-
Step 500
500
#4F7FFF
oklch(63.1% 0.197 265.6)
-
Step 600
600
#3664EE
oklch(55.6% 0.214 265.6)
-
Step 700
700
#2952CF
oklch(49.1% 0.199 265.5)
-
Step 800
800
#2344A7
oklch(42.7% 0.164 265.6)
-
Step 900
900 (this color)
#223D87
oklch(38.5% 0.128 265.6)
-
Step 950
950
#13234E
oklch(27% 0.082 265.8)
#223D87 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) | #06478A | 0.029 |
| Deuteranopia (no green cones) | #003D86 | 0.023 |
| Tritanopia (no blue cones) | #004F5C | 0.102 |
| Achromatopsia (no color) | #424242 | 0.128 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #223D87
#223D87
oklch(38.5% 0.128 265.6)
- #564000
#564000
oklch(38.5% 0.079 86.5)
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 #223D87, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.032
- Twilight Blue #0A437A ΔE 0.033
- Dark Slate Blue #483D8B ΔE 0.054
- Light Navy #155084 ΔE 0.055
- Blueberry #464196 ΔE 0.058
- Marine Blue #01386A ΔE 0.059
- Sapphire #2138AB ΔE 0.061
- Dusk Blue #26538D ΔE 0.063
Use #223D87 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.