#2840AB
Closest named color: Sapphire (#2138AB). oklch(42.5% 0.173 268.2), rgb(40, 64, 171).
Aa
White text reads best on this color (8.70:1).
About this color
#2840AB is a dark, vivid blue. In OKLCH its lightness is 42%, its chroma 0.173 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.021 away. White text reads best on it, at 8.70:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | vivid (0.173) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 2.41:1 |
| White text | 8.70:1 |
Values
| HEX | #2840AB |
| RGB | rgb(40, 64, 171) |
| HSL | hsl(229, 62%, 41%) |
| OKLCH | oklch(42.5% 0.173 268.2) |
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 #2840AB | 8.70:1 | AAA | Lc -93.8 | Preferred for body text |
| Black text on #2840AB | 2.41:1 | Fails | Lc 14.7 | Not readable |
| #2840AB text on white | 8.70:1 | AAA | Lc 89.2 | Fine for body text |
| #2840AB text on black | 2.41:1 | Fails | Lc -13.0 | 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 800.
-
Step 50
50
#F1F5FF
oklch(97% 0.014 268.5)
-
Step 100
100
#E1EAFE
oklch(93.6% 0.029 266.4)
-
Step 200
200
#C9D9FF
oklch(88.6% 0.055 267.2)
-
Step 300
300
#A6BFFF
oklch(80.9% 0.095 267.8)
-
Step 400
400
#789BFF
oklch(70.8% 0.152 267.9)
-
Step 500
500
#577DFF
oklch(63.1% 0.197 268)
-
Step 600
600
#3E60F4
oklch(55.7% 0.224 268.1)
-
Step 700
700
#314DD5
oklch(49.1% 0.21 268.2)
-
Step 800
800 (this color)
#2840AB
oklch(42.5% 0.173 268.2)
-
Step 900
900
#243988
oklch(37.8% 0.134 268)
-
Step 950
950
#152250
oklch(27.1% 0.086 268.3)
#2840AB 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) | #0051AE | 0.043 |
| Deuteranopia (no green cones) | #0045A9 | 0.025 |
| Tritanopia (no blue cones) | #005C6F | 0.137 |
| Achromatopsia (no color) | #4B4B4B | 0.173 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2840AB
#2840AB
oklch(42.5% 0.173 268.2)
- #624B00
#624B00
oklch(42.5% 0.087 88.4)
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 #2840AB, closest first.
No curated palette has a color within ΔE 0.04 of #2840AB.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.021
- Blue Blue #2242C7 ΔE 0.045
- Cobalt #1E488F ΔE 0.052
- Blueberry #464196 ΔE 0.053
- Majorelle Blue #3F37C9 ΔE 0.056
- Dark Slate Blue #483D8B ΔE 0.067
- Indigo Blue #3A18B1 ΔE 0.068
- Blue With A Hint Of Purple #533CC6 ΔE 0.073
Use #2840AB 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.