#103F9F
Closest named color: Sapphire (#2138AB). oklch(40.4% 0.164 262.3), rgb(16, 63, 159).
Aa
White text reads best on this color (9.40:1).
About this color
#103F9F is a dark, vivid blue. In OKLCH its lightness is 40%, its chroma 0.164 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.027 away. White text reads best on it, at 9.40:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | vivid (0.164) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 2.23:1 |
| White text | 9.40:1 |
Values
| HEX | #103F9F |
| RGB | rgb(16, 63, 159) |
| HSL | hsl(220, 82%, 34%) |
| OKLCH | oklch(40.4% 0.164 262.3) |
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 #103F9F | 9.40:1 | AAA | Lc -95.4 | Preferred for body text |
| Black text on #103F9F | 2.23:1 | Fails | Lc 13.0 | Not readable |
| #103F9F text on white | 9.40:1 | AAA | Lc 91.0 | Preferred for body text |
| #103F9F text on black | 2.23:1 | Fails | Lc -11.3 | 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
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E0EAFD
oklch(93.5% 0.028 263.4)
-
Step 200
200
#C6DAFD
oklch(88.5% 0.053 261.7)
-
Step 300
300
#9FC1FF
oklch(80.9% 0.096 262.2)
-
Step 400
400
#6B9EFF
oklch(70.7% 0.153 262.2)
-
Step 500
500
#4482FE
oklch(63.2% 0.196 262.3)
-
Step 600
600
#2667ED
oklch(55.6% 0.213 262.4)
-
Step 700
700
#1955CE
oklch(49.2% 0.197 262.2)
-
Step 800
800 (this color)
#103F9F
oklch(40.4% 0.164 262.3)
-
Step 900
900
#193C84
oklch(37.6% 0.128 262.5)
-
Step 950
950
#0F244D
oklch(27% 0.081 262.1)
#103F9F 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) | #004DA2 | 0.036 |
| Deuteranopia (no green cones) | #00409D | 0.008 |
| Tritanopia (no blue cones) | #005868 | 0.127 |
| Achromatopsia (no color) | #464646 | 0.164 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #103F9F
#103F9F
oklch(40.4% 0.164 262.3)
- #5F4300
#5F4300
oklch(40.3% 0.083 81.5)
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 #103F9F, closest first.
No curated palette has a color within ΔE 0.04 of #103F9F.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.027
- Cobalt #1E488F ΔE 0.039
- Blueberry #464196 ΔE 0.063
- Twilight Blue #0A437A ΔE 0.064
- Blue Blue #2242C7 ΔE 0.067
- Light Navy #155084 ΔE 0.068
- Dusk Blue #26538D ΔE 0.069
- Dark Slate Blue #483D8B ΔE 0.071
Use #103F9F 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.