#10488D
Closest named color: Cobalt (#1E488F). oklch(40.8% 0.128 256.5), rgb(16, 72, 141).
Aa
White text reads best on this color (8.99:1).
About this color
#10488D is a dark, moderately saturated blue. In OKLCH its lightness is 41%, its chroma 0.128 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.010 away. White text reads best on it, at 8.99:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | moderately saturated (0.128) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.33:1 |
| White text | 8.99:1 |
Values
| HEX | #10488D |
| RGB | rgb(16, 72, 141) |
| HSL | hsl(213, 80%, 31%) |
| OKLCH | oklch(40.8% 0.128 256.5) |
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 #10488D | 8.99:1 | AAA | Lc -94.6 | Preferred for body text |
| Black text on #10488D | 2.33:1 | Fails | Lc 13.8 | Not readable |
| #10488D text on white | 8.99:1 | AAA | Lc 90.1 | Preferred for body text |
| #10488D text on black | 2.33:1 | Fails | Lc -12.1 | 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
#E1EBF9
oklch(93.7% 0.022 256.7)
-
Step 200
200
#C8DBF5
oklch(88.5% 0.041 256.2)
-
Step 300
300
#A2C3F1
oklch(80.9% 0.075 256.7)
-
Step 400
400
#6EA2EA
oklch(70.6% 0.12 256.7)
-
Step 500
500
#4689E4
oklch(63% 0.154 256.8)
-
Step 600
600
#2571D2
oklch(55.6% 0.167 256.6)
-
Step 700
700
#175EB6
oklch(49.1% 0.155 256.7)
-
Step 800
800 (this color)
#10488D
oklch(40.8% 0.128 256.5)
-
Step 900
900
#1A4175
oklch(37.7% 0.099 256.7)
-
Step 950
950
#102645
oklch(26.9% 0.064 257.3)
#10488D 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) | #204F90 | 0.025 |
| Deuteranopia (no green cones) | #00448C | 0.015 |
| Tritanopia (no blue cones) | #005963 | 0.098 |
| Achromatopsia (no color) | #494949 | 0.128 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #10488D
#10488D
oklch(40.8% 0.128 256.5)
- #644200
#644200
oklch(40.8% 0.086 75.8)
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 #10488D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.010
- Light Navy #155084 ΔE 0.030
- Twilight Blue #0A437A ΔE 0.034
- Dusk Blue #26538D ΔE 0.038
- Deep Sea Blue #015482 ΔE 0.042
- Blueberry #464196 ΔE 0.061
- Light Navy Blue #2E5A88 ΔE 0.063
- Sapphire #2138AB ΔE 0.064
Use #10488D 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.