#273B83
Closest named color: Twilight Blue (#0A437A). oklch(38% 0.124 268.3), rgb(39, 59, 131).
Aa
White text reads best on this color (10.29:1).
About this color
#273B83 is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.124 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.035 away. White text reads best on it, at 10.29:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.124) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.03:1 |
| White text | 10.29:1 |
Values
| HEX | #273B83 |
| RGB | rgb(39, 59, 131) |
| HSL | hsl(227, 54%, 33%) |
| OKLCH | oklch(38% 0.124 268.3) |
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 #273B83 | 10.29:1 | AAA | Lc -97.6 | Preferred for body text |
| Black text on #273B83 | 2.03:1 | Fails | Lc 10.4 | Not readable |
| #273B83 text on white | 10.29:1 | AAA | Lc 93.6 | Preferred for body text |
| #273B83 text on black | 2.03:1 | Fails | Lc -9.0 | 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 900.
-
Step 50
50
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E2EAFD
oklch(93.7% 0.027 267.5)
-
Step 200
200
#CBD9FC
oklch(88.6% 0.051 268.1)
-
Step 300
300
#A7BFFD
oklch(80.9% 0.092 268)
-
Step 400
400
#7A9BFD
oklch(70.8% 0.148 268.4)
-
Step 500
500
#5A7EFA
oklch(63.1% 0.189 268.4)
-
Step 600
600
#4263E9
oklch(55.5% 0.206 268.3)
-
Step 700
700
#3551CB
oklch(49.1% 0.191 268.4)
-
Step 800
800
#2B43A4
oklch(42.6% 0.159 268.2)
-
Step 900
900 (this color)
#273B83
oklch(38% 0.124 268.3)
-
Step 950
950
#16234C
oklch(27% 0.078 267.7)
#273B83 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) | #094586 | 0.032 |
| Deuteranopia (no green cones) | #003C82 | 0.028 |
| Tritanopia (no blue cones) | #004C59 | 0.100 |
| Achromatopsia (no color) | #404040 | 0.124 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #273B83
#273B83
oklch(38% 0.124 268.3)
- #533F00
#533F00
oklch(37.9% 0.077 88.3)
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 #273B83, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.035
- Cobalt #1E488F ΔE 0.039
- Dark Slate Blue #483D8B ΔE 0.052
- Marine Blue #01386A ΔE 0.055
- Blueberry #464196 ΔE 0.058
- Light Navy #155084 ΔE 0.059
- Sapphire #2138AB ΔE 0.067
- Dusk Blue #26538D ΔE 0.068
Use #273B83 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.