#223C99
Closest named color: Sapphire (#2138AB). oklch(39.8% 0.155 267), rgb(34, 60, 153).
Aa
White text reads best on this color (9.65:1).
About this color
#223C99 is a dark, vivid blue. In OKLCH its lightness is 40%, its chroma 0.155 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.031 away. White text reads best on it, at 9.65:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | vivid (0.155) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 2.17:1 |
| White text | 9.65:1 |
Values
| HEX | #223C99 |
| RGB | rgb(34, 60, 153) |
| HSL | hsl(227, 64%, 37%) |
| OKLCH | oklch(39.8% 0.155 267) |
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 #223C99 | 9.65:1 | AAA | Lc -96.1 | Preferred for body text |
| Black text on #223C99 | 2.17:1 | Fails | Lc 12.1 | Not readable |
| #223C99 text on white | 9.65:1 | AAA | Lc 91.8 | Preferred for body text |
| #223C99 text on black | 2.17:1 | 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
#F1F5FF
oklch(97% 0.014 268.5)
-
Step 100
100
#E1EAFF
oklch(93.7% 0.03 267.2)
-
Step 200
200
#C9D9FF
oklch(88.6% 0.055 267.2)
-
Step 300
300
#A5BFFF
oklch(80.9% 0.095 267.2)
-
Step 400
400
#769BFF
oklch(70.7% 0.152 267.2)
-
Step 500
500
#547EFF
oklch(63.1% 0.197 267)
-
Step 600
600
#355CFF
oklch(55.6% 0.244 267)
-
Step 700
700
#2746E6
oklch(49.1% 0.241 267)
-
Step 800
800
#203BB9
oklch(42.6% 0.199 267)
-
Step 900
900 (this color)
#223C99
oklch(39.8% 0.155 267)
-
Step 950
950
#112156
oklch(27.1% 0.098 266.8)
#223C99 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) | #004A9C | 0.037 |
| Deuteranopia (no green cones) | #003F97 | 0.021 |
| Tritanopia (no blue cones) | #005464 | 0.123 |
| Achromatopsia (no color) | #454545 | 0.155 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #223C99
#223C99
oklch(39.8% 0.155 267)
- #5A4400
#5A4400
oklch(39.9% 0.082 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 #223C99, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.031
- Cobalt #1E488F ΔE 0.036
- Blueberry #464196 ΔE 0.052
- Dark Slate Blue #483D8B ΔE 0.058
- Twilight Blue #0A437A ΔE 0.059
- Light Navy #155084 ΔE 0.068
- Dusk Blue #26538D ΔE 0.069
- Indigo Blue #3A18B1 ΔE 0.073
Use #223C99 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.