#273C93
Closest named color: Cobalt (#1E488F). oklch(39.5% 0.145 268.5), rgb(39, 60, 147).
Aa
White text reads best on this color (9.74:1).
About this color
#273C93 is a dark, vivid blue. In OKLCH its lightness is 40%, its chroma 0.145 and its hue 269°. 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 9.74:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | vivid (0.145) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.15:1 |
| White text | 9.74:1 |
Values
| HEX | #273C93 |
| RGB | rgb(39, 60, 147) |
| HSL | hsl(228, 58%, 36%) |
| OKLCH | oklch(39.5% 0.145 268.5) |
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 #273C93 | 9.74:1 | AAA | Lc -96.4 | Preferred for body text |
| Black text on #273C93 | 2.15:1 | Fails | Lc 11.8 | Not readable |
| #273C93 text on white | 9.74:1 | AAA | Lc 92.1 | Preferred for body text |
| #273C93 text on black | 2.15:1 | Fails | Lc -10.3 | 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 900.
-
Step 50
50
#F1F5FF
oklch(97% 0.014 268.5)
-
Step 100
100
#E1EAFF
oklch(93.7% 0.03 267.2)
-
Step 200
200
#CAD9FF
oklch(88.6% 0.055 268.3)
-
Step 300
300
#A7BFFF
oklch(81% 0.095 268.4)
-
Step 400
400
#799AFF
oklch(70.6% 0.153 268.6)
-
Step 500
500
#597DFF
oklch(63.2% 0.197 268.6)
-
Step 600
600
#3C5BFE
oklch(55.6% 0.243 268.5)
-
Step 700
700
#3049DD
oklch(49.1% 0.225 268.5)
-
Step 800
800
#273DB3
oklch(42.6% 0.187 268.5)
-
Step 900
900 (this color)
#273C93
oklch(39.5% 0.145 268.5)
-
Step 950
950
#142153
oklch(27% 0.093 268.5)
#273C93 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) | #004996 | 0.037 |
| Deuteranopia (no green cones) | #003F91 | 0.026 |
| Tritanopia (no blue cones) | #005261 | 0.117 |
| Achromatopsia (no color) | #444444 | 0.146 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #273C93
#273C93
oklch(39.5% 0.145 268.5)
- #584300
#584300
oklch(39.4% 0.081 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 #273C93, 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 0.041
- Blueberry #464196 ΔE 0.047
- Dark Slate Blue #483D8B ΔE 0.050
- Twilight Blue #0A437A ΔE 0.052
- Light Navy #155084 ΔE 0.063
- Dusk Blue #26538D ΔE 0.065
- Deep Sea Blue #015482 ΔE 0.077
Use #273C93 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.