#103FB9
Closest named color: Blue Blue (#2242C7). oklch(42.8% 0.198 263.7), rgb(16, 63, 185).
Aa
White text reads best on this color (8.62:1).
About this color
#103FB9 is a dark, vivid blue. In OKLCH its lightness is 43%, its chroma 0.198 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Blue Blue (#2242C7), ΔE 0.028 away. White text reads best on it, at 8.62:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | vivid (0.198) |
| Temperature | cool |
| Nearest name | Blue Blue (#2242C7) |
| Black text | 2.43:1 |
| White text | 8.62:1 |
Values
| HEX | #103FB9 |
| RGB | rgb(16, 63, 185) |
| HSL | hsl(223, 84%, 39%) |
| OKLCH | oklch(42.8% 0.198 263.7) |
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 #103FB9 | 8.62:1 | AAA | Lc -93.3 | Preferred for body text |
| Black text on #103FB9 | 2.43:1 | Fails | Lc 15.3 | Dividers and decoration only |
| #103FB9 text on white | 8.62:1 | AAA | Lc 88.7 | Fine for body text |
| #103FB9 text on black | 2.43:1 | Fails | Lc -13.5 | 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
#F1F6FF
oklch(97.2% 0.013 262.4)
-
Step 100
100
#E0EAFF
oklch(93.6% 0.03 265.3)
-
Step 200
200
#C6DAFF
oklch(88.5% 0.056 262.8)
-
Step 300
300
#A1C0FF
oklch(80.8% 0.096 264.1)
-
Step 400
400
#6F9DFF
oklch(70.7% 0.152 263.9)
-
Step 500
500
#4980FF
oklch(63% 0.198 264)
-
Step 600
600
#2160FF
oklch(55.7% 0.244 263.7)
-
Step 700
700
#104AE5
oklch(49.1% 0.239 263.8)
-
Step 800
800 (this color)
#103FB9
oklch(42.8% 0.198 263.7)
-
Step 900
900
#133892
oklch(37.8% 0.154 263.6)
-
Step 950
950
#0C2255
oklch(27% 0.097 263.6)
#103FB9 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) | #0054BD | 0.050 |
| Deuteranopia (no green cones) | #0044B7 | 0.012 |
| Tritanopia (no blue cones) | #006076 | 0.150 |
| Achromatopsia (no color) | #4C4C4C | 0.198 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #103FB9
#103FB9
oklch(42.8% 0.198 263.7)
- #664A00
#664A00
oklch(42.8% 0.088 83.6)
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 #103FB9, closest first.
No curated palette has a color within ΔE 0.04 of #103FB9.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue Blue #2242C7 ΔE 0.028
- Sapphire #2138AB ΔE 0.028
- Majorelle Blue #3F37C9 ΔE 0.052
- Indigo Blue #3A18B1 ΔE 0.072
- Cobalt #1E488F ΔE 0.073
- True Blue #010FCC ΔE 0.073
- Blue With A Hint Of Purple #533CC6 ΔE 0.079
- Ultramarine Blue #1805DB ΔE 0.080
Use #103FB9 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.