#10319F
Closest named color: Sapphire (#2138AB). oklch(37.7% 0.181 265), rgb(16, 49, 159).
Aa
White text reads best on this color (10.70:1).
About this color
#10319F is a dark, vivid blue. In OKLCH its lightness is 38%, its chroma 0.181 and its hue 265°. 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 10.70:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | vivid (0.181) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 1.96:1 |
| White text | 10.70:1 |
Values
| HEX | #10319F |
| RGB | rgb(16, 49, 159) |
| HSL | hsl(226, 82%, 34%) |
| OKLCH | oklch(37.7% 0.181 265) |
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 #10319F | 10.70:1 | AAA | Lc -97.9 | Preferred for body text |
| Black text on #10319F | 1.96:1 | Fails | Lc 10.1 | Not readable |
| #10319F text on white | 10.70:1 | AAA | Lc 93.8 | Preferred for body text |
| #10319F text on black | 1.96:1 | Fails | Lc -8.7 | 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
#F1F6FF
oklch(97.2% 0.013 262.4)
-
Step 100
100
#E0EAFF
oklch(93.6% 0.03 265.3)
-
Step 200
200
#C7D9FF
oklch(88.4% 0.056 265.2)
-
Step 300
300
#A3C0FF
oklch(80.9% 0.095 265.2)
-
Step 400
400
#719CFF
oklch(70.6% 0.153 265)
-
Step 500
500
#4D80FF
oklch(63.2% 0.197 264.8)
-
Step 600
600
#2A5EFF
oklch(55.6% 0.245 265.1)
-
Step 700
700
#113AFB
oklch(49.1% 0.28 265)
-
Step 800
800
#0E33CB
oklch(42.7% 0.232 265)
-
Step 900
900 (this color)
#10319F
oklch(37.7% 0.181 265)
-
Step 950
950
#0A1F5D
oklch(27.1% 0.114 265)
#10319F 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) | #0045A2 | 0.047 |
| Deuteranopia (no green cones) | #00379D | 0.014 |
| Tritanopia (no blue cones) | #005064 | 0.138 |
| Achromatopsia (no color) | #3E3E3E | 0.181 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #10319F
#10319F
oklch(37.7% 0.181 265)
- #543D00
#543D00
oklch(37.5% 0.077 84.5)
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 #10319F, closest first.
No curated palette has a color within ΔE 0.04 of #10319F.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.032
- Royal #0C1793 ΔE 0.056
- Ultramarine #2000B1 ΔE 0.059
- Cobalt Blue #030AA7 ΔE 0.059
- Indigo Blue #3A18B1 ΔE 0.062
- Cobalt #1E488F ΔE 0.067
- Twilight Blue #0A437A ΔE 0.078
- True Blue #010FCC ΔE 0.080
Use #10319F 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.