#3143A5
Closest named color: Sapphire (#2138AB). oklch(43% 0.159 270.4), rgb(49, 67, 165).
Aa
White text reads best on this color (8.47:1).
About this color
#3143A5 is a dark, vivid blue. In OKLCH its lightness is 43%, its chroma 0.159 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.035 away. White text reads best on it, at 8.47:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | vivid (0.159) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 2.47:1 |
| White text | 8.47:1 |
Values
| HEX | #3143A5 |
| RGB | rgb(49, 67, 165) |
| HSL | hsl(231, 54%, 42%) |
| OKLCH | oklch(43% 0.159 270.4) |
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 #3143A5 | 8.47:1 | AAA | Lc -93.3 | Preferred for body text |
| Black text on #3143A5 | 2.47:1 | Fails | Lc 15.3 | Dividers and decoration only |
| #3143A5 text on white | 8.47:1 | AAA | Lc 88.7 | Fine for body text |
| #3143A5 text on black | 2.47:1 | Fails | Lc -13.5 | 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
#AABEFD
oklch(80.9% 0.092 270.6)
-
Step 400
400
#7E9AFD
oklch(70.8% 0.148 270.3)
-
Step 500
500
#5F7CFA
oklch(63% 0.19 270.4)
-
Step 600
600
#4962E9
oklch(55.7% 0.205 270.3)
-
Step 700
700
#3B50CB
oklch(49.2% 0.191 270.3)
-
Step 800
800 (this color)
#3143A5
oklch(43% 0.159 270.4)
-
Step 900
900
#2A3982
oklch(37.6% 0.124 270.6)
-
Step 950
950
#18224C
oklch(26.9% 0.079 270.3)
#3143A5 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) | #0052A8 | 0.044 |
| Deuteranopia (no green cones) | #0048A3 | 0.034 |
| Tritanopia (no blue cones) | #005B6D | 0.128 |
| Achromatopsia (no color) | #4D4D4D | 0.159 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3143A5
#3143A5
oklch(43% 0.159 270.4)
- #624D00
#624D00
oklch(43% 0.088 90.6)
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 #3143A5, closest first.
No curated palette has a color within ΔE 0.04 of #3143A5.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.035
- Blueberry #464196 ΔE 0.037
- Cobalt #1E488F ΔE 0.043
- Dark Slate Blue #483D8B ΔE 0.053
- Blue Blue #2242C7 ΔE 0.056
- Dusk Blue #26538D ΔE 0.062
- Majorelle Blue #3F37C9 ΔE 0.063
- Light Navy #155084 ΔE 0.071
Use #3143A5 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.