#223F97
Closest named color: Cobalt (#1E488F). oklch(40.2% 0.149 266), rgb(34, 63, 151).
Aa
White text reads best on this color (9.43:1).
About this color
#223F97 is a dark, vivid blue. In OKLCH its lightness is 40%, its chroma 0.149 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.028 away. White text reads best on it, at 9.43:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | vivid (0.149) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.22:1 |
| White text | 9.43:1 |
Values
| HEX | #223F97 |
| RGB | rgb(34, 63, 151) |
| HSL | hsl(225, 63%, 36%) |
| OKLCH | oklch(40.2% 0.149 266) |
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 #223F97 | 9.43:1 | AAA | Lc -95.6 | Preferred for body text |
| Black text on #223F97 | 2.22:1 | Fails | Lc 12.7 | Not readable |
| #223F97 text on white | 9.43:1 | AAA | Lc 91.3 | Preferred for body text |
| #223F97 text on black | 2.22:1 | Fails | Lc -11.0 | 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 800.
-
Step 50
50
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E2EAFB
oklch(93.6% 0.025 265.6)
-
Step 200
200
#CAD9FA
oklch(88.5% 0.048 266)
-
Step 300
300
#A6C0FA
oklch(80.9% 0.087 265.8)
-
Step 400
400
#789DF7
oklch(70.8% 0.139 266)
-
Step 500
500
#5681F4
oklch(63.1% 0.178 266)
-
Step 600
600
#3D67E2
oklch(55.5% 0.193 266)
-
Step 700
700
#3055C5
oklch(49.1% 0.18 266)
-
Step 800
800 (this color)
#223F97
oklch(40.2% 0.149 266)
-
Step 900
900
#243C7E
oklch(37.6% 0.116 266)
-
Step 950
950
#15244A
oklch(27% 0.073 265.6)
#223F97 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) | #004C9A | 0.035 |
| Deuteranopia (no green cones) | #004195 | 0.020 |
| Tritanopia (no blue cones) | #005564 | 0.118 |
| Achromatopsia (no color) | #464646 | 0.149 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #223F97
#223F97
oklch(40.2% 0.149 266)
- #5C4400
#5C4400
oklch(40.2% 0.082 85.6)
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 #223F97, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.028
- Sapphire #2138AB ΔE 0.036
- Blueberry #464196 ΔE 0.049
- Twilight Blue #0A437A ΔE 0.054
- Dark Slate Blue #483D8B ΔE 0.054
- Light Navy #155084 ΔE 0.060
- Dusk Blue #26538D ΔE 0.060
- Deep Sea Blue #015482 ΔE 0.073
Use #223F97 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.