#273E89
Closest named color: Cobalt (#1E488F). oklch(39.1% 0.128 267.3), rgb(39, 62, 137).
Aa
White text reads best on this color (9.82:1).
About this color
#273E89 is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.128 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.028 away. White text reads best on it, at 9.82:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.128) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.13:1 |
| White text | 9.82:1 |
Values
| HEX | #273E89 |
| RGB | rgb(39, 62, 137) |
| HSL | hsl(226, 56%, 35%) |
| OKLCH | oklch(39.1% 0.128 267.3) |
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 #273E89 | 9.82:1 | AAA | Lc -96.6 | Preferred for body text |
| Black text on #273E89 | 2.13:1 | Fails | Lc 11.5 | Not readable |
| #273E89 text on white | 9.82:1 | AAA | Lc 92.4 | Preferred for body text |
| #273E89 text on black | 2.13:1 | Fails | Lc -10.0 | 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
#F1F5FE
oklch(97% 0.013 266.7)
-
Step 100
100
#E2EAFD
oklch(93.7% 0.027 267.5)
-
Step 200
200
#C9D9FE
oklch(88.5% 0.054 266.8)
-
Step 300
300
#A5BFFF
oklch(80.9% 0.095 267.2)
-
Step 400
400
#779BFF
oklch(70.7% 0.152 267.5)
-
Step 500
500
#557EFF
oklch(63.2% 0.197 267.3)
-
Step 600
600
#3D63EE
oklch(55.7% 0.213 267.3)
-
Step 700
700
#3050CF
oklch(49% 0.199 267.4)
-
Step 800
800
#2843A7
oklch(42.7% 0.164 267.3)
-
Step 900
900 (this color)
#273E89
oklch(39.1% 0.128 267.3)
-
Step 950
950
#15234E
oklch(27.1% 0.081 267.2)
#273E89 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) | #08488C | 0.031 |
| Deuteranopia (no green cones) | #003F87 | 0.027 |
| Tritanopia (no blue cones) | #00505D | 0.104 |
| Achromatopsia (no color) | #434343 | 0.129 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #273E89
#273E89
oklch(39.1% 0.128 267.3)
- #574200
#574200
oklch(39.1% 0.08 88)
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 #273E89, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.028
- Twilight Blue #0A437A ΔE 0.037
- Dark Slate Blue #483D8B ΔE 0.047
- Blueberry #464196 ΔE 0.050
- Light Navy #155084 ΔE 0.053
- Sapphire #2138AB ΔE 0.058
- Dusk Blue #26538D ΔE 0.059
- Marine Blue #01386A ΔE 0.065
Use #273E89 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.