#103F9B
Closest named color: Sapphire (#2138AB). oklch(40% 0.158 262), rgb(16, 63, 155).
Aa
White text reads best on this color (9.51:1).
About this color
#103F9B is a dark, vivid blue. In OKLCH its lightness is 40%, its chroma 0.158 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.032 away. White text reads best on it, at 9.51:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | vivid (0.158) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 2.20:1 |
| White text | 9.51:1 |
Values
| HEX | #103F9B |
| RGB | rgb(16, 63, 155) |
| HSL | hsl(220, 81%, 34%) |
| OKLCH | oklch(40% 0.158 262) |
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 #103F9B | 9.51:1 | AAA | Lc -95.7 | Preferred for body text |
| Black text on #103F9B | 2.20:1 | Fails | Lc 12.6 | Not readable |
| #103F9B text on white | 9.51:1 | AAA | Lc 91.3 | Preferred for body text |
| #103F9B text on black | 2.20:1 | Fails | Lc -11.0 | 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
#0D61FF
oklch(55.5% 0.245 262)
-
Step 700
700
#004FDE
oklch(49.1% 0.227 262)
-
Step 800
800
#0040B8
oklch(42.7% 0.197 262)
-
Step 900
900 (this color)
#103F9B
oklch(40% 0.158 262)
-
Step 950
950
#082256
oklch(27% 0.1 262.1)
#103F9B 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) | #004C9E | 0.034 |
| Deuteranopia (no green cones) | #003F99 | 0.008 |
| Tritanopia (no blue cones) | #005766 | 0.123 |
| Achromatopsia (no color) | #454545 | 0.159 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #103F9B
#103F9B
oklch(40% 0.158 262)
- #5E4200
#5E4200
oklch(40% 0.083 81.2)
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 #103F9B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.032
- Cobalt #1E488F ΔE 0.035
- Twilight Blue #0A437A ΔE 0.057
- Blueberry #464196 ΔE 0.062
- Light Navy #155084 ΔE 0.064
- Dusk Blue #26538D ΔE 0.067
- Dark Slate Blue #483D8B ΔE 0.069
- Blue Blue #2242C7 ΔE 0.074
Use #103F9B 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.