#223F8F
Closest named color: Cobalt (#1E488F). oklch(39.6% 0.137 265.4), rgb(34, 63, 143).
Aa
White text reads best on this color (9.65:1).
About this color
#223F8F is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.137 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.024 away. White text reads best on it, at 9.65:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.137) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.17:1 |
| White text | 9.65:1 |
Values
| HEX | #223F8F |
| RGB | rgb(34, 63, 143) |
| HSL | hsl(224, 62%, 35%) |
| OKLCH | oklch(39.6% 0.137 265.4) |
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 #223F8F | 9.65:1 | AAA | Lc -96.2 | Preferred for body text |
| Black text on #223F8F | 2.17:1 | Fails | Lc 12.0 | Not readable |
| #223F8F text on white | 9.65:1 | AAA | Lc 91.9 | Preferred for body text |
| #223F8F text on black | 2.17:1 | Fails | Lc -10.5 | 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
#F1F6FF
oklch(97.2% 0.013 262.4)
-
Step 100
100
#E0EAFF
oklch(93.6% 0.03 265.3)
-
Step 200
200
#C8D9FF
oklch(88.5% 0.056 266.2)
-
Step 300
300
#A3C0FF
oklch(80.9% 0.095 265.2)
-
Step 400
400
#729CFF
oklch(70.6% 0.153 265.4)
-
Step 500
500
#4F7FFF
oklch(63.1% 0.197 265.6)
-
Step 600
600
#3161F6
oklch(55.5% 0.229 265.5)
-
Step 700
700
#254FD7
oklch(49.1% 0.213 265.5)
-
Step 800
800
#1F42AD
oklch(42.7% 0.176 265.4)
-
Step 900
900 (this color)
#223F8F
oklch(39.6% 0.137 265.4)
-
Step 950
950
#112350
oklch(27.1% 0.086 264.8)
#223F8F 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) | #004A92 | 0.032 |
| Deuteranopia (no green cones) | #00408D | 0.021 |
| Tritanopia (no blue cones) | #005360 | 0.110 |
| Achromatopsia (no color) | #454545 | 0.137 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #223F8F
#223F8F
oklch(39.6% 0.137 265.4)
- #5A4200
#5A4200
oklch(39.5% 0.081 85)
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 #223F8F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.024
- Twilight Blue #0A437A ΔE 0.042
- Sapphire #2138AB ΔE 0.049
- Blueberry #464196 ΔE 0.051
- Dark Slate Blue #483D8B ΔE 0.052
- Light Navy #155084 ΔE 0.053
- Dusk Blue #26538D ΔE 0.058
- Deep Sea Blue #015482 ΔE 0.067
Use #223F8F 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.