#12429B
Closest named color: Cobalt (#1E488F). oklch(40.7% 0.154 261.5), rgb(18, 66, 155).
Aa
White text reads best on this color (9.21:1).
About this color
#12429B is a dark, vivid blue. In OKLCH its lightness is 41%, its chroma 0.154 and its hue 261°. 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 9.21:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | vivid (0.154) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.27:1 |
| White text | 9.21:1 |
Values
| HEX | #12429B |
| RGB | rgb(18, 66, 155) |
| HSL | hsl(219, 79%, 34%) |
| OKLCH | oklch(40.7% 0.154 261.5) |
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 #12429B | 9.21:1 | AAA | Lc -95.0 | Preferred for body text |
| Black text on #12429B | 2.27:1 | Fails | Lc 13.4 | Not readable |
| #12429B text on white | 9.21:1 | AAA | Lc 90.6 | Preferred for body text |
| #12429B text on black | 2.27:1 | Fails | Lc -11.7 | 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 800.
-
Step 50
50
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E0EAFC
oklch(93.5% 0.027 262.3)
-
Step 200
200
#C7DAFB
oklch(88.5% 0.05 261.5)
-
Step 300
300
#A0C1FB
oklch(80.8% 0.09 261.5)
-
Step 400
400
#6D9FFA
oklch(70.7% 0.144 261.6)
-
Step 500
500
#4684F7
oklch(63.2% 0.184 261.5)
-
Step 600
600
#276AE6
oklch(55.6% 0.2 261.4)
-
Step 700
700
#1A57C8
oklch(49.1% 0.187 261.5)
-
Step 800
800 (this color)
#12429B
oklch(40.7% 0.154 261.5)
-
Step 900
900
#1A3E80
oklch(37.8% 0.119 261.3)
-
Step 950
950
#10254B
oklch(27.1% 0.076 261.2)
#12429B 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) | #004E9E | 0.031 |
| Deuteranopia (no green cones) | #004299 | 0.009 |
| Tritanopia (no blue cones) | #005868 | 0.117 |
| Achromatopsia (no color) | #484848 | 0.154 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #12429B
#12429B
oklch(40.7% 0.154 261.5)
- #604400
#604400
oklch(40.7% 0.084 81.8)
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 #12429B, 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 0.035
- Twilight Blue #0A437A ΔE 0.056
- Light Navy #155084 ΔE 0.058
- Blueberry #464196 ΔE 0.058
- Dusk Blue #26538D ΔE 0.059
- Dark Slate Blue #483D8B ΔE 0.066
- Deep Sea Blue #015482 ΔE 0.070
Use #12429B 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.