#12579C
Closest named color: Dusk Blue (#26538D). oklch(45.5% 0.13 253.2), rgb(18, 87, 156).
Aa
White text reads best on this color (7.31:1).
About this color
#12579C is a medium-dark, moderately saturated blue. In OKLCH its lightness is 46%, its chroma 0.130 and its hue 253°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.026 away. White text reads best on it, at 7.31:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | moderately saturated (0.130) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.86:1 |
| White text | 7.31:1 |
Values
| HEX | #12579C |
| RGB | rgb(18, 87, 156) |
| HSL | hsl(210, 79%, 34%) |
| OKLCH | oklch(45.5% 0.13 253.2) |
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 #12579C | 7.31:1 | AAA | Lc -89.8 | Fine for body text |
| Black text on #12579C | 2.86:1 | Fails | Lc 19.1 | Dividers and decoration only |
| #12579C text on white | 7.31:1 | AAA | Lc 84.9 | Fine for body text |
| #12579C text on black | 2.86:1 | Fails | Lc -17.1 | Dividers and decoration only |
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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E0EBF9
oklch(93.6% 0.022 254.4)
-
Step 200
200
#C6DBF5
oklch(88.4% 0.042 253.8)
-
Step 300
300
#9EC4F1
oklch(80.9% 0.076 253)
-
Step 400
400
#68A4EA
oklch(70.7% 0.121 253.2)
-
Step 500
500
#3A8BE4
oklch(63.1% 0.155 253.3)
-
Step 600
600
#0A73D2
oklch(55.6% 0.169 253.2)
-
Step 700
700
#0060B4
oklch(49.1% 0.153 253.4)
-
Step 800
800 (this color)
#12579C
oklch(45.5% 0.13 253.2)
-
Step 900
900
#114275
oklch(37.6% 0.101 253.1)
-
Step 950
950
#0C2745
oklch(27% 0.065 253.3)
#12579C 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) | #335D9F | 0.032 |
| Deuteranopia (no green cones) | #17519B | 0.017 |
| Tritanopia (no blue cones) | #006872 | 0.096 |
| Achromatopsia (no color) | #565656 | 0.130 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #12579C
#12579C
oklch(45.5% 0.13 253.2)
- #774D00
#774D00
oklch(45.6% 0.097 73.3)
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 #12579C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.026
- Light Navy Blue #2E5A88 ΔE 0.040
- Denim Blue #3B5B92 ΔE 0.040
- Light Navy #155084 ΔE 0.042
- Deep Sea Blue #015482 ΔE 0.044
- Cobalt #1E488F ΔE 0.044
- Peacock Blue #016795 ΔE 0.050
- Dusky Blue #475F94 ΔE 0.057
Use #12579C 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.