#273E64
Closest named color: Dark Grey Blue (#29465B). oklch(36.4% 0.072 260), rgb(39, 62, 100).
Aa
White text reads best on this color (10.71:1).
About this color
#273E64 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.072 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.034 away. White text reads best on it, at 10.71:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.072) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 1.95:1 |
| White text | 10.71:1 |
Values
| HEX | #273E64 |
| RGB | rgb(39, 62, 100) |
| HSL | hsl(217, 44%, 27%) |
| OKLCH | oklch(36.4% 0.072 260) |
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 #273E64 | 10.71:1 | AAA | Lc -98.6 | Preferred for body text |
| Black text on #273E64 | 1.95:1 | Fails | Lc 9.2 | Not readable |
| #273E64 text on white | 10.71:1 | AAA | Lc 94.7 | Preferred for body text |
| #273E64 text on black | 1.95:1 | Fails | Lc -7.9 | 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
#F3F6FA
oklch(97.2% 0.006 255.5)
-
Step 100
100
#E4EAF5
oklch(93.6% 0.016 262.8)
-
Step 200
200
#CEDAEE
oklch(88.5% 0.03 260.7)
-
Step 300
300
#ADC2E4
oklch(81% 0.053 260)
-
Step 400
400
#81A2D7
oklch(70.8% 0.086 259.7)
-
Step 500
500
#618ACC
oklch(63.2% 0.11 259.6)
-
Step 600
600
#4872B9
oklch(55.5% 0.121 260.3)
-
Step 700
700
#39609F
oklch(49.2% 0.111 259.6)
-
Step 800
800
#304E81
oklch(42.6% 0.092 260.4)
-
Step 900
900 (this color)
#273E64
oklch(36.4% 0.072 260)
-
Step 950
950
#19263D
oklch(26.9% 0.047 261.3)
#273E64 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) | #2E4166 | 0.014 |
| Deuteranopia (no green cones) | #273B63 | 0.009 |
| Tritanopia (no blue cones) | #00464C | 0.063 |
| Achromatopsia (no color) | #3E3E3E | 0.072 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #273E64
#273E64
oklch(36.4% 0.072 260)
- #523905
#523905
oklch(36.4% 0.072 79.6)
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 #273E64, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.034
- Prussian Blue #1D3557 ΔE 0.037
- Marine Blue #01386A ΔE 0.040
- Twilight Blue #0A437A ΔE 0.041
- Dark Blue Grey #1F3B4D ΔE 0.042
- Charcoal #264653 ΔE 0.045
- Midnight Green #073B4C ΔE 0.054
- Onyx #343A40 ΔE 0.062
Use #273E64 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.