#22378D
Closest named color: Cobalt (#1E488F). oklch(37.7% 0.145 268.1), rgb(34, 55, 141).
Aa
White text reads best on this color (10.50:1).
About this color
#22378D is a dark, vivid blue. In OKLCH its lightness is 38%, its chroma 0.145 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.045 away. White text reads best on it, at 10.50:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | vivid (0.145) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 1.99:1 |
| White text | 10.50:1 |
Values
| HEX | #22378D |
| RGB | rgb(34, 55, 141) |
| HSL | hsl(228, 61%, 34%) |
| OKLCH | oklch(37.7% 0.145 268.1) |
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 #22378D | 10.50:1 | AAA | Lc -97.9 | Preferred for body text |
| Black text on #22378D | 1.99:1 | Fails | Lc 10.1 | Not readable |
| #22378D text on white | 10.50:1 | AAA | Lc 93.9 | Preferred for body text |
| #22378D text on black | 1.99:1 | Fails | Lc -8.7 | 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
#A6BFFF
oklch(80.9% 0.095 267.8)
-
Step 400
400
#789BFF
oklch(70.8% 0.152 267.9)
-
Step 500
500
#577DFF
oklch(63.1% 0.197 268)
-
Step 600
600
#3B5CFD
oklch(55.6% 0.241 268.1)
-
Step 700
700
#2E4ADD
oklch(49.2% 0.224 268)
-
Step 800
800
#263EB2
oklch(42.7% 0.185 268)
-
Step 900
900 (this color)
#22378D
oklch(37.7% 0.145 268.1)
-
Step 950
950
#142152
oklch(26.9% 0.091 268.4)
#22378D 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) | #004490 | 0.036 |
| Deuteranopia (no green cones) | #003A8B | 0.023 |
| Tritanopia (no blue cones) | #004D5C | 0.116 |
| Achromatopsia (no color) | #3F3F3F | 0.145 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #22378D
#22378D
oklch(37.7% 0.145 268.1)
- #533F00
#533F00
oklch(37.9% 0.077 88.3)
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 #22378D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.045
- Twilight Blue #0A437A ΔE 0.049
- Sapphire #2138AB ΔE 0.050
- Dark Slate Blue #483D8B ΔE 0.059
- Blueberry #464196 ΔE 0.062
- Marine Blue #01386A ΔE 0.066
- Light Navy #155084 ΔE 0.072
- Royal #0C1793 ΔE 0.073
Use #22378D 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.