#273E9B
Closest named color: Sapphire (#2138AB). oklch(40.6% 0.154 268.1), rgb(39, 62, 155).
Aa
White text reads best on this color (9.33:1).
About this color
#273E9B is a dark, vivid blue. In OKLCH its lightness is 41%, its chroma 0.154 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.030 away. White text reads best on it, at 9.33:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | vivid (0.154) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 2.24:1 |
| White text | 9.33:1 |
Values
| HEX | #273E9B |
| RGB | rgb(39, 62, 155) |
| HSL | hsl(228, 60%, 38%) |
| OKLCH | oklch(40.6% 0.154 268.1) |
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 #273E9B | 9.33:1 | AAA | Lc -95.4 | Preferred for body text |
| Black text on #273E9B | 2.24:1 | Fails | Lc 12.9 | Not readable |
| #273E9B text on white | 9.33:1 | AAA | Lc 91.1 | Preferred for body text |
| #273E9B text on black | 2.24:1 | Fails | Lc -11.3 | 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
#CBD9FB
oklch(88.6% 0.049 267.7)
-
Step 300
300
#A8BFFC
oklch(80.9% 0.09 268.4)
-
Step 400
400
#7A9BFA
oklch(70.6% 0.144 268.1)
-
Step 500
500
#5A7FF7
oklch(63.1% 0.184 267.9)
-
Step 600
600
#4365E6
oklch(55.7% 0.199 268.1)
-
Step 700
700
#3552C8
oklch(49% 0.186 268.1)
-
Step 800
800 (this color)
#273E9B
oklch(40.6% 0.154 268.1)
-
Step 900
900
#273B80
oklch(37.7% 0.119 268.1)
-
Step 950
950
#17234B
oklch(27% 0.076 268.4)
#273E9B 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) | #004C9E | 0.038 |
| Deuteranopia (no green cones) | #004199 | 0.025 |
| Tritanopia (no blue cones) | #005566 | 0.122 |
| Achromatopsia (no color) | #474747 | 0.154 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #273E9B
#273E9B
oklch(40.6% 0.154 268.1)
- #5C4600
#5C4600
oklch(40.6% 0.083 88.1)
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 #273E9B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.030
- Cobalt #1E488F ΔE 0.034
- Blueberry #464196 ΔE 0.045
- Dark Slate Blue #483D8B ΔE 0.053
- Twilight Blue #0A437A ΔE 0.062
- Dusk Blue #26538D ΔE 0.064
- Light Navy #155084 ΔE 0.066
- Blue Blue #2242C7 ΔE 0.072
Use #273E9B 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.