#103B8F
Closest named color: Cobalt (#1E488F). oklch(38.1% 0.147 261.9), rgb(16, 59, 143).
Aa
White text reads best on this color (10.27:1).
About this color
#103B8F is a dark, vivid blue. In OKLCH its lightness is 38%, its chroma 0.147 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.039 away. White text reads best on it, at 10.27:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | vivid (0.147) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.04:1 |
| White text | 10.27:1 |
Values
| HEX | #103B8F |
| RGB | rgb(16, 59, 143) |
| HSL | hsl(220, 80%, 31%) |
| OKLCH | oklch(38.1% 0.147 261.9) |
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 #103B8F | 10.27:1 | AAA | Lc -97.3 | Preferred for body text |
| Black text on #103B8F | 2.04:1 | Fails | Lc 10.7 | Not readable |
| #103B8F text on white | 10.27:1 | AAA | Lc 93.2 | Preferred for body text |
| #103B8F text on black | 2.04:1 | Fails | Lc -9.3 | 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 900.
-
Step 50
50
#F0F6FF
oklch(97.1% 0.014 258.3)
-
Step 100
100
#DFEAFF
oklch(93.5% 0.031 263.5)
-
Step 200
200
#C5DAFF
oklch(88.5% 0.056 261.8)
-
Step 300
300
#9FC1FF
oklch(80.9% 0.096 262.2)
-
Step 400
400
#6A9EFF
oklch(70.6% 0.153 261.9)
-
Step 500
500
#4182FF
oklch(63.1% 0.198 261.8)
-
Step 600
600
#0C61FF
oklch(55.5% 0.246 262)
-
Step 700
700
#004FDD
oklch(49% 0.226 261.9)
-
Step 800
800
#0542B4
oklch(42.7% 0.189 261.9)
-
Step 900
900 (this color)
#103B8F
oklch(38.1% 0.147 261.9)
-
Step 950
950
#0A2353
oklch(27% 0.093 261.7)
#103B8F 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) | #004792 | 0.032 |
| Deuteranopia (no green cones) | #003B8D | 0.009 |
| Tritanopia (no blue cones) | #00505F | 0.112 |
| Achromatopsia (no color) | #414141 | 0.147 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #103B8F
#103B8F
oklch(38.1% 0.147 261.9)
- #573E00
#573E00
oklch(38.2% 0.079 82.8)
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 #103B8F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.039
- Twilight Blue #0A437A ΔE 0.043
- Sapphire #2138AB ΔE 0.049
- Marine Blue #01386A ΔE 0.065
- Light Navy #155084 ΔE 0.065
- Blueberry #464196 ΔE 0.069
- Dark Slate Blue #483D8B ΔE 0.069
- Dusk Blue #26538D ΔE 0.073
Use #103B8F 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.