#303EA1
Closest named color: Sapphire (#2138AB). oklch(41.6% 0.16 271.4), rgb(48, 62, 161).
Aa
White text reads best on this color (9.01:1).
About this color
#303EA1 is a dark, vivid blue. In OKLCH its lightness is 42%, its chroma 0.160 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.028 away. White text reads best on it, at 9.01:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | vivid (0.160) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 2.32:1 |
| White text | 9.01:1 |
Values
| HEX | #303EA1 |
| RGB | rgb(48, 62, 161) |
| HSL | hsl(233, 54%, 41%) |
| OKLCH | oklch(41.6% 0.16 271.4) |
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 #303EA1 | 9.01:1 | AAA | Lc -94.7 | Preferred for body text |
| Black text on #303EA1 | 2.32:1 | Fails | Lc 13.8 | Not readable |
| #303EA1 text on white | 9.01:1 | AAA | Lc 90.2 | Preferred for body text |
| #303EA1 text on black | 2.32:1 | Fails | Lc -12.1 | 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
#E3E9FD
oklch(93.5% 0.028 272.5)
-
Step 200
200
#CCD8FC
oklch(88.5% 0.051 270.8)
-
Step 300
300
#ABBEFE
oklch(81% 0.093 271.4)
-
Step 400
400
#8099FD
oklch(70.8% 0.149 271.5)
-
Step 500
500
#627CFB
oklch(63.2% 0.19 271.3)
-
Step 600
600
#4C60EA
oklch(55.5% 0.208 271.6)
-
Step 700
700
#3E4ECC
oklch(49.1% 0.194 271.6)
-
Step 800
800 (this color)
#303EA1
oklch(41.6% 0.16 271.4)
-
Step 900
900
#2B3982
oklch(37.7% 0.123 271.1)
-
Step 950
950
#19224C
oklch(27% 0.078 271.2)
#303EA1 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) | #004EA4 | 0.046 |
| Deuteranopia (no green cones) | #00449F | 0.035 |
| Tritanopia (no blue cones) | #005769 | 0.130 |
| Achromatopsia (no color) | #494949 | 0.160 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #303EA1
#303EA1
oklch(41.6% 0.16 271.4)
- #5D4A00
#5D4A00
oklch(41.7% 0.085 91.9)
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 #303EA1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.028
- Blueberry #464196 ΔE 0.038
- Cobalt #1E488F ΔE 0.043
- Dark Slate Blue #483D8B ΔE 0.050
- Blue Blue #2242C7 ΔE 0.063
- Majorelle Blue #3F37C9 ΔE 0.067
- Dusk Blue #26538D ΔE 0.068
- Indigo Blue #3A18B1 ΔE 0.068
Use #303EA1 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.