#10538F
Closest named color: Dusk Blue (#26538D). oklch(43.6% 0.117 251.1), rgb(16, 83, 143).
Aa
White text reads best on this color (7.90:1).
About this color
#10538F is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.117 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.014 away. White text reads best on it, at 7.90:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.117) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.65:1 |
| White text | 7.90:1 |
Values
| HEX | #10538F |
| RGB | rgb(16, 83, 143) |
| HSL | hsl(208, 80%, 31%) |
| OKLCH | oklch(43.6% 0.117 251.1) |
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 #10538F | 7.90:1 | AAA | Lc -91.7 | Preferred for body text |
| Black text on #10538F | 2.65:1 | Fails | Lc 17.1 | Dividers and decoration only |
| #10538F text on white | 7.90:1 | AAA | Lc 87.0 | Fine for body text |
| #10538F text on black | 2.65:1 | Fails | Lc -15.1 | 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
#E0EBF7
oklch(93.5% 0.02 250.4)
-
Step 200
200
#C7DCF2
oklch(88.6% 0.038 249.5)
-
Step 300
300
#A0C4EC
oklch(80.8% 0.069 251.4)
-
Step 400
400
#6BA5E3
oklch(70.7% 0.11 251.1)
-
Step 500
500
#3F8DDB
oklch(63.1% 0.141 251)
-
Step 600
600
#1775C8
oklch(55.5% 0.152 251.2)
-
Step 700
700
#0362AD
oklch(49.1% 0.141 251)
-
Step 800
800 (this color)
#10538F
oklch(43.6% 0.117 251.1)
-
Step 900
900
#154370
oklch(37.7% 0.092 251.3)
-
Step 950
950
#0E2842
oklch(27.1% 0.058 250.8)
#10538F 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) | #355791 | 0.033 |
| Deuteranopia (no green cones) | #1F4C8E | 0.020 |
| Tritanopia (no blue cones) | #00616A | 0.084 |
| Achromatopsia (no color) | #515151 | 0.117 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #10538F
#10538F
oklch(43.6% 0.117 251.1)
- #714700
#714700
oklch(43.6% 0.094 71.2)
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 #10538F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.014
- Light Navy #155084 ΔE 0.019
- Deep Sea Blue #015482 ΔE 0.024
- Cobalt #1E488F ΔE 0.031
- Light Navy Blue #2E5A88 ΔE 0.035
- Denim Blue #3B5B92 ΔE 0.046
- Twilight Blue #0A437A ΔE 0.056
- Peacock Blue #016795 ΔE 0.058
Use #10538F 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.