#10304E
Closest named color: Prussian Blue (#1D3557). oklch(30.2% 0.066 249.7), rgb(16, 48, 78).
Aa
White text reads best on this color (13.50:1).
About this color
#10304E is a dark, muted blue. In OKLCH its lightness is 30%, its chroma 0.066 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.027 away. White text reads best on it, at 13.50:1.
| Hue family | Blues |
| Lightness | dark (30%) |
| Chroma | muted (0.066) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.55:1 |
| White text | 13.50:1 |
Values
| HEX | #10304E |
| RGB | rgb(16, 48, 78) |
| HSL | hsl(209, 66%, 18%) |
| OKLCH | oklch(30.2% 0.066 249.7) |
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 #10304E | 13.50:1 | AAA | Lc -102.9 | Preferred for body text |
| Black text on #10304E | 1.55:1 | Fails | Lc 0.0 | Not readable |
| #10304E text on white | 13.50:1 | AAA | Lc 99.8 | Preferred for body text |
| #10304E text on black | 1.55:1 | Fails | Lc 0.0 | 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 950.
-
Step 50
50
#F0F6FC
oklch(97% 0.01 247.9)
-
Step 100
100
#DFEBF9
oklch(93.5% 0.023 252.2)
-
Step 200
200
#C4DCF5
oklch(88.5% 0.043 249.4)
-
Step 300
300
#9AC5F2
oklch(80.9% 0.079 250)
-
Step 400
400
#5FA6EB
oklch(70.8% 0.124 249.4)
-
Step 500
500
#278DE5
oklch(63.1% 0.16 249.7)
-
Step 600
600
#0076CA
oklch(55.7% 0.156 249.7)
-
Step 700
700
#0063AB
oklch(49.2% 0.138 249.7)
-
Step 800
800
#00518D
oklch(42.7% 0.12 249.5)
-
Step 900
900
#024376
oklch(37.7% 0.105 249.8)
-
Step 950
950 (this color)
#10304E
oklch(30.2% 0.066 249.7)
#10304E 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) | #22324F | 0.022 |
| Deuteranopia (no green cones) | #192C4D | 0.014 |
| Tritanopia (no blue cones) | #00373B | 0.049 |
| Achromatopsia (no color) | #2E2E2E | 0.066 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #10304E
#10304E
oklch(30.2% 0.066 249.7)
- #432700
#432700
oklch(30.2% 0.066 69.1)
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 #10304E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.027
- Marine #042E60 ΔE 0.035
- Midnight Green #073B4C ΔE 0.038
- Space Cadet #2B2D42 ΔE 0.038
- Gunmetal #293241 ΔE 0.040
- Oxford Blue #1B263B ΔE 0.042
- Dark Blue Grey #1F3B4D ΔE 0.043
- Marine Blue #01386A ΔE 0.052
Use #10304E 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.