#2543A0
Closest named color: Sapphire (#2138AB). oklch(42% 0.155 266.2), rgb(37, 67, 160).
Aa
White text reads best on this color (8.78:1).
About this color
#2543A0 is a dark, vivid blue. In OKLCH its lightness is 42%, its chroma 0.155 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.032 away. White text reads best on it, at 8.78:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | vivid (0.155) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 2.38:1 |
| White text | 8.78:1 |
Values
| HEX | #2543A0 |
| RGB | rgb(37, 67, 160) |
| HSL | hsl(225, 62%, 39%) |
| OKLCH | oklch(42% 0.155 266.2) |
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 #2543A0 | 8.78:1 | AAA | Lc -94.1 | Preferred for body text |
| Black text on #2543A0 | 2.38:1 | Fails | Lc 14.4 | Not readable |
| #2543A0 text on white | 8.78:1 | AAA | Lc 89.6 | Fine for body text |
| #2543A0 text on black | 2.38:1 | Fails | Lc -12.7 | 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
#E2EAFC
oklch(93.6% 0.026 266.6)
-
Step 200
200
#CAD9FB
oklch(88.5% 0.05 266.5)
-
Step 300
300
#A5C0FC
oklch(80.9% 0.09 265.7)
-
Step 400
400
#769CFB
oklch(70.7% 0.146 266.3)
-
Step 500
500
#5480F8
oklch(63% 0.186 266.1)
-
Step 600
600
#3C66E7
oklch(55.6% 0.201 266.2)
-
Step 700
700
#2F54C9
oklch(49.2% 0.187 266.2)
-
Step 800
800 (this color)
#2543A0
oklch(42% 0.155 266.2)
-
Step 900
900
#233B81
oklch(37.6% 0.122 266.3)
-
Step 950
950
#15234B
oklch(26.9% 0.076 266.7)
#2543A0 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) | #0050A3 | 0.035 |
| Deuteranopia (no green cones) | #00459E | 0.022 |
| Tritanopia (no blue cones) | #005A6B | 0.121 |
| Achromatopsia (no color) | #4B4B4B | 0.155 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2543A0
#2543A0
oklch(42% 0.155 266.2)
- #624900
#624900
oklch(42.1% 0.086 86)
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 #2543A0, closest first.
No curated palette has a color within ΔE 0.04 of #2543A0.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.032
- Cobalt #1E488F ΔE 0.032
- Blueberry #464196 ΔE 0.045
- Dusk Blue #26538D ΔE 0.057
- Dark Slate Blue #483D8B ΔE 0.057
- Light Navy #155084 ΔE 0.062
- Blue Blue #2242C7 ΔE 0.063
- Twilight Blue #0A437A ΔE 0.068
Use #2543A0 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.