#303EA4
Closest named color: Sapphire (#2138AB). oklch(41.9% 0.164 271.4), rgb(48, 62, 164).
Aa
White text reads best on this color (8.93:1).
About this color
#303EA4 is a dark, vivid blue. In OKLCH its lightness is 42%, its chroma 0.164 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.026 away. White text reads best on it, at 8.93:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | vivid (0.164) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 2.35:1 |
| White text | 8.93:1 |
Values
| HEX | #303EA4 |
| RGB | rgb(48, 62, 164) |
| HSL | hsl(233, 55%, 42%) |
| OKLCH | oklch(41.9% 0.164 271.4) |
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 #303EA4 | 8.93:1 | AAA | Lc -94.4 | Preferred for body text |
| Black text on #303EA4 | 2.35:1 | Fails | Lc 14.0 | Not readable |
| #303EA4 text on white | 8.93:1 | AAA | Lc 90.0 | Fine for body text |
| #303EA4 text on black | 2.35:1 | Fails | Lc -12.3 | 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
#CCD8FD
oklch(88.5% 0.053 271.1)
-
Step 300
300
#AABEFF
oklch(81% 0.095 271)
-
Step 400
400
#7F99FF
oklch(70.8% 0.152 271.3)
-
Step 500
500
#617BFE
oklch(63.2% 0.196 271.3)
-
Step 600
600
#4B5FED
oklch(55.5% 0.213 271.4)
-
Step 700
700
#3D4DCE
oklch(49% 0.198 271.5)
-
Step 800
800 (this color)
#303EA4
oklch(41.9% 0.164 271.4)
-
Step 900
900
#2B3884
oklch(37.7% 0.128 271.5)
-
Step 950
950
#19224D
oklch(27.1% 0.08 271.2)
#303EA4 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) | #004FA7 | 0.047 |
| Deuteranopia (no green cones) | #0044A2 | 0.034 |
| Tritanopia (no blue cones) | #00586B | 0.132 |
| Achromatopsia (no color) | #494949 | 0.164 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #303EA4
#303EA4
oklch(41.9% 0.164 271.4)
- #5E4A00
#5E4A00
oklch(41.8% 0.085 90.9)
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 #303EA4, closest first.
No curated palette has a color within ΔE 0.04 of #303EA4.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.026
- Blueberry #464196 ΔE 0.040
- Cobalt #1E488F ΔE 0.047
- Dark Slate Blue #483D8B ΔE 0.054
- Blue Blue #2242C7 ΔE 0.058
- Majorelle Blue #3F37C9 ΔE 0.063
- Indigo Blue #3A18B1 ΔE 0.066
- Dusk Blue #26538D ΔE 0.070
Use #303EA4 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.