#2543AB
Closest named color: Sapphire (#2138AB). oklch(42.9% 0.17 266.6), rgb(37, 67, 171).
Aa
White text reads best on this color (8.50:1).
About this color
#2543AB is a dark, vivid blue. In OKLCH its lightness is 43%, its chroma 0.170 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.027 away. White text reads best on it, at 8.50:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | vivid (0.170) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 2.46:1 |
| White text | 8.50:1 |
Values
| HEX | #2543AB |
| RGB | rgb(37, 67, 171) |
| HSL | hsl(227, 64%, 41%) |
| OKLCH | oklch(42.9% 0.17 266.6) |
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 #2543AB | 8.50:1 | AAA | Lc -93.3 | Preferred for body text |
| Black text on #2543AB | 2.46:1 | Fails | Lc 15.3 | Dividers and decoration only |
| #2543AB text on white | 8.50:1 | AAA | Lc 88.7 | Fine for body text |
| #2543AB text on black | 2.46:1 | 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
#F1F5FF
oklch(97% 0.014 268.5)
-
Step 100
100
#E1EAFE
oklch(93.6% 0.029 266.4)
-
Step 200
200
#C8D9FF
oklch(88.5% 0.056 266.2)
-
Step 300
300
#A4BFFF
oklch(80.8% 0.096 266.6)
-
Step 400
400
#759BFF
oklch(70.6% 0.153 266.8)
-
Step 500
500
#527EFF
oklch(63% 0.198 266.5)
-
Step 600
600
#3862F2
oklch(55.6% 0.221 266.5)
-
Step 700
700
#2C50D3
oklch(49.2% 0.205 266.6)
-
Step 800
800 (this color)
#2543AB
oklch(42.9% 0.17 266.6)
-
Step 900
900
#213A87
oklch(37.8% 0.133 266.4)
-
Step 950
950
#13234F
oklch(27.1% 0.084 265.9)
#2543AB 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) | #0053AE | 0.041 |
| Deuteranopia (no green cones) | #0047A9 | 0.021 |
| Tritanopia (no blue cones) | #005E70 | 0.134 |
| Achromatopsia (no color) | #4D4D4D | 0.170 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2543AB
#2543AB
oklch(42.9% 0.17 266.6)
- #654B00
#654B00
oklch(42.9% 0.088 85.7)
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 #2543AB, closest first.
No curated palette has a color within ΔE 0.04 of #2543AB.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.027
- Blue Blue #2242C7 ΔE 0.045
- Cobalt #1E488F ΔE 0.049
- Blueberry #464196 ΔE 0.053
- Majorelle Blue #3F37C9 ΔE 0.059
- Dusk Blue #26538D ΔE 0.068
- Dark Slate Blue #483D8B ΔE 0.069
- Blue With A Hint Of Purple #533CC6 ΔE 0.075
Use #2543AB 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.