#23479C
Closest named color: Cobalt (#1E488F). oklch(42.4% 0.145 263.9), rgb(35, 71, 156).
Aa
White text reads best on this color (8.56:1).
About this color
#23479C is a dark, vivid blue. In OKLCH its lightness is 42%, its chroma 0.145 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.022 away. White text reads best on it, at 8.56:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | vivid (0.145) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.45:1 |
| White text | 8.56:1 |
Values
| HEX | #23479C |
| RGB | rgb(35, 71, 156) |
| HSL | hsl(222, 63%, 37%) |
| OKLCH | oklch(42.4% 0.145 263.9) |
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 #23479C | 8.56:1 | AAA | Lc -93.5 | Preferred for body text |
| Black text on #23479C | 2.45:1 | Fails | Lc 15.0 | Dividers and decoration only |
| #23479C text on white | 8.56:1 | AAA | Lc 89.0 | Fine for body text |
| #23479C text on black | 2.45:1 | Fails | Lc -13.2 | 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
#F2F6FD
oklch(97.2% 0.01 261.8)
-
Step 100
100
#E2EAFB
oklch(93.6% 0.025 265.6)
-
Step 200
200
#C9DAF9
oklch(88.5% 0.047 262.5)
-
Step 300
300
#A5C1F8
oklch(81% 0.084 263.6)
-
Step 400
400
#759EF5
oklch(70.7% 0.136 264.1)
-
Step 500
500
#5283F1
oklch(63.1% 0.173 264)
-
Step 600
600
#376AE0
oklch(55.7% 0.189 263.8)
-
Step 700
700
#2A57C2
oklch(49.1% 0.175 263.9)
-
Step 800
800 (this color)
#23479C
oklch(42.4% 0.145 263.9)
-
Step 900
900
#213D7D
oklch(37.6% 0.114 264)
-
Step 950
950
#142449
oklch(26.9% 0.072 264.5)
#23479C 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) | #03529F | 0.031 |
| Deuteranopia (no green cones) | #00479A | 0.020 |
| Tritanopia (no blue cones) | #005C6A | 0.115 |
| Achromatopsia (no color) | #4C4C4C | 0.145 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #23479C
#23479C
oklch(42.4% 0.145 263.9)
- #644900
#644900
oklch(42.3% 0.087 84.2)
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 #23479C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.022
- Sapphire #2138AB ΔE 0.044
- Dusk Blue #26538D ΔE 0.045
- Blueberry #464196 ΔE 0.045
- Light Navy #155084 ΔE 0.051
- Dark Slate Blue #483D8B ΔE 0.056
- Twilight Blue #0A437A ΔE 0.061
- Deep Sea Blue #015482 ΔE 0.062
Use #23479C 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.