#2743A0
Closest named color: Cobalt (#1E488F). oklch(42.1% 0.155 266.8), rgb(39, 67, 160).
Aa
White text reads best on this color (8.76:1).
About this color
#2743A0 is a dark, vivid blue. In OKLCH its lightness is 42%, its chroma 0.155 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.033 away. White text reads best on it, at 8.76:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | vivid (0.155) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.39:1 |
| White text | 8.76:1 |
Values
| HEX | #2743A0 |
| RGB | rgb(39, 67, 160) |
| HSL | hsl(226, 61%, 39%) |
| OKLCH | oklch(42.1% 0.155 266.8) |
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 #2743A0 | 8.76:1 | AAA | Lc -94.0 | Preferred for body text |
| Black text on #2743A0 | 2.39:1 | Fails | Lc 14.5 | Not readable |
| #2743A0 text on white | 8.76:1 | AAA | Lc 89.5 | Fine for body text |
| #2743A0 text on black | 2.39:1 | 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
#A6BFFC
oklch(80.8% 0.091 267.1)
-
Step 400
400
#789CFA
oklch(70.7% 0.144 266.9)
-
Step 500
500
#5780F8
oklch(63.2% 0.185 266.9)
-
Step 600
600
#3E65E7
oklch(55.5% 0.202 266.9)
-
Step 700
700
#3153C9
oklch(49.1% 0.187 266.9)
-
Step 800
800 (this color)
#2743A0
oklch(42.1% 0.155 266.8)
-
Step 900
900
#243B81
oklch(37.7% 0.122 266.8)
-
Step 950
950
#15234B
oklch(26.9% 0.076 266.7)
#2743A0 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) | #0051A3 | 0.038 |
| Deuteranopia (no green cones) | #00459E | 0.024 |
| Tritanopia (no blue cones) | #005A6B | 0.122 |
| Achromatopsia (no color) | #4B4B4B | 0.155 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2743A0
#2743A0
oklch(42.1% 0.155 266.8)
- #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 #2743A0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.033
- Sapphire #2138AB ΔE 0.033
- Blueberry #464196 ΔE 0.043
- Dark Slate Blue #483D8B ΔE 0.056
- Dusk Blue #26538D ΔE 0.057
- Blue Blue #2242C7 ΔE 0.063
- Light Navy #155084 ΔE 0.063
- Twilight Blue #0A437A ΔE 0.068
Use #2743A0 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.