#273F63
Closest named color: Dark Grey Blue (#29465B). oklch(36.6% 0.069 258.3), rgb(39, 63, 99).
Aa
White text reads best on this color (10.61:1).
About this color
#273F63 is a dark, muted blue. In OKLCH its lightness is 37%, its chroma 0.069 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.030 away. White text reads best on it, at 10.61:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | muted (0.069) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 1.97:1 |
| White text | 10.61:1 |
Values
| HEX | #273F63 |
| RGB | rgb(39, 63, 99) |
| HSL | hsl(216, 43%, 27%) |
| OKLCH | oklch(36.6% 0.069 258.3) |
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 #273F63 | 10.61:1 | AAA | Lc -98.5 | Preferred for body text |
| Black text on #273F63 | 1.97:1 | Fails | Lc 9.4 | Not readable |
| #273F63 text on white | 10.61:1 | AAA | Lc 94.5 | Preferred for body text |
| #273F63 text on black | 1.97:1 | Fails | Lc -8.1 | 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
#E4EAF4
oklch(93.5% 0.015 260.7)
-
Step 200
200
#CEDAED
oklch(88.5% 0.029 259.6)
-
Step 300
300
#ACC2E3
oklch(80.8% 0.053 258.4)
-
Step 400
400
#81A2D5
oklch(70.7% 0.084 258.9)
-
Step 500
500
#608AC9
oklch(63% 0.106 258.3)
-
Step 600
600
#4773B6
oklch(55.5% 0.116 258.6)
-
Step 700
700
#38609D
oklch(49% 0.108 258.6)
-
Step 800
800
#2F4F7F
oklch(42.7% 0.089 258.3)
-
Step 900
900 (this color)
#273F63
oklch(36.6% 0.069 258.3)
-
Step 950
950
#19273C
oklch(27.1% 0.044 258.3)
#273F63 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) | #304265 | 0.016 |
| Deuteranopia (no green cones) | #293C62 | 0.009 |
| Tritanopia (no blue cones) | #00474C | 0.061 |
| Achromatopsia (no color) | #3E3E3E | 0.069 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #273F63
#273F63
oklch(36.6% 0.069 258.3)
- #533A0B
#533A0B
oklch(36.8% 0.07 78.3)
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 #273F63, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.030
- Prussian Blue #1D3557 ΔE 0.039
- Charcoal #264653 ΔE 0.041
- Dark Blue Grey #1F3B4D ΔE 0.041
- Twilight Blue #0A437A ΔE 0.043
- Marine Blue #01386A ΔE 0.043
- Midnight Green #073B4C ΔE 0.053
- Onyx #343A40 ΔE 0.060
Use #273F63 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.