#303E9C
Closest named color: Sapphire (#2138AB). oklch(41.2% 0.153 271.5), rgb(48, 62, 156).
Aa
White text reads best on this color (9.15:1).
About this color
#303E9C is a dark, vivid blue. In OKLCH its lightness is 41%, its chroma 0.153 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.034 away. White text reads best on it, at 9.15:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | vivid (0.153) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 2.29:1 |
| White text | 9.15:1 |
Values
| HEX | #303E9C |
| RGB | rgb(48, 62, 156) |
| HSL | hsl(232, 53%, 40%) |
| OKLCH | oklch(41.2% 0.153 271.5) |
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 #303E9C | 9.15:1 | AAA | Lc -95.0 | Preferred for body text |
| Black text on #303E9C | 2.29:1 | Fails | Lc 13.4 | Not readable |
| #303E9C text on white | 9.15:1 | AAA | Lc 90.6 | Preferred for body text |
| #303E9C text on black | 2.29:1 | Fails | Lc -11.7 | 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 800.
-
Step 50
50
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E3E9FC
oklch(93.5% 0.027 271.9)
-
Step 200
200
#CDD8FB
oklch(88.5% 0.05 271.6)
-
Step 300
300
#ACBEFB
oklch(81% 0.089 271.6)
-
Step 400
400
#8199F9
oklch(70.6% 0.143 271.7)
-
Step 500
500
#647DF6
oklch(63.2% 0.182 271.5)
-
Step 600
600
#4D62E5
oklch(55.6% 0.199 271.5)
-
Step 700
700
#3F50C7
oklch(49.1% 0.185 271.6)
-
Step 800
800 (this color)
#303E9C
oklch(41.2% 0.153 271.5)
-
Step 900
900
#2C3980
oklch(37.6% 0.12 271.6)
-
Step 950
950
#1A224B
oklch(27% 0.076 272.1)
#303E9C 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) | #004D9F | 0.045 |
| Deuteranopia (no green cones) | #00439A | 0.035 |
| Tritanopia (no blue cones) | #005567 | 0.123 |
| Achromatopsia (no color) | #484848 | 0.153 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #303E9C
#303E9C
oklch(41.2% 0.153 271.5)
- #5C4900
#5C4900
oklch(41.3% 0.085 91.7)
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 #303E9C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.034
- Blueberry #464196 ΔE 0.035
- Cobalt #1E488F ΔE 0.038
- Dark Slate Blue #483D8B ΔE 0.045
- Dusk Blue #26538D ΔE 0.064
- Twilight Blue #0A437A ΔE 0.068
- Light Navy #155084 ΔE 0.069
- Blue Blue #2242C7 ΔE 0.070
Use #303E9C 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.