#12498B
Closest named color: Cobalt (#1E488F). oklch(41% 0.123 255.9), rgb(18, 73, 139).
Aa
White text reads best on this color (8.93:1).
About this color
#12498B is a dark, moderately saturated blue. In OKLCH its lightness is 41%, its chroma 0.123 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.011 away. White text reads best on it, at 8.93:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | moderately saturated (0.123) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.35:1 |
| White text | 8.93:1 |
Values
| HEX | #12498B |
| RGB | rgb(18, 73, 139) |
| HSL | hsl(213, 77%, 31%) |
| OKLCH | oklch(41% 0.123 255.9) |
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 #12498B | 8.93:1 | AAA | Lc -94.5 | Preferred for body text |
| Black text on #12498B | 2.35:1 | Fails | Lc 14.0 | Not readable |
| #12498B text on white | 8.93:1 | AAA | Lc 90.0 | Fine for body text |
| #12498B text on black | 2.35:1 | Fails | Lc -12.3 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E1EBF8
oklch(93.6% 0.021 254.9)
-
Step 200
200
#C8DBF4
oklch(88.5% 0.04 255.3)
-
Step 300
300
#A2C3EF
oklch(80.8% 0.072 255.7)
-
Step 400
400
#6FA3E7
oklch(70.7% 0.115 255.5)
-
Step 500
500
#488AE0
oklch(63.1% 0.147 256)
-
Step 600
600
#2772CE
oklch(55.6% 0.16 255.9)
-
Step 700
700
#195FB2
oklch(49.1% 0.148 255.8)
-
Step 800
800 (this color)
#12498B
oklch(41% 0.123 255.9)
-
Step 900
900
#1B4173
oklch(37.6% 0.096 256.4)
-
Step 950
950
#112743
oklch(27.1% 0.059 255.4)
#12498B 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) | #254F8D | 0.024 |
| Deuteranopia (no green cones) | #02458A | 0.015 |
| Tritanopia (no blue cones) | #005963 | 0.093 |
| Achromatopsia (no color) | #4A4A4A | 0.123 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #12498B
#12498B
oklch(41% 0.123 255.9)
- #654300
#654300
oklch(41.1% 0.086 76.1)
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 #12498B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.011
- Light Navy #155084 ΔE 0.026
- Twilight Blue #0A437A ΔE 0.033
- Dusk Blue #26538D ΔE 0.035
- Deep Sea Blue #015482 ΔE 0.038
- Light Navy Blue #2E5A88 ΔE 0.060
- Blueberry #464196 ΔE 0.062
- Dark Slate Blue #483D8B ΔE 0.065
Use #12498B 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.