#273F65
Closest named color: Dark Grey Blue (#29465B). oklch(36.8% 0.072 259.2), rgb(39, 63, 101).
Aa
White text reads best on this color (10.57:1).
About this color
#273F65 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.072 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.032 away. White text reads best on it, at 10.57:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.072) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 1.98:1 |
| White text | 10.57:1 |
Values
| HEX | #273F65 |
| RGB | rgb(39, 63, 101) |
| HSL | hsl(217, 44%, 27%) |
| OKLCH | oklch(36.8% 0.072 259.2) |
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 #273F65 | 10.57:1 | AAA | Lc -98.4 | Preferred for body text |
| Black text on #273F65 | 1.98:1 | Fails | Lc 9.5 | Not readable |
| #273F65 text on white | 10.57:1 | AAA | Lc 94.4 | Preferred for body text |
| #273F65 text on black | 1.98:1 | Fails | Lc -8.2 | 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
#ACC2E4
oklch(80.9% 0.054 259)
-
Step 400
400
#80A2D7
oklch(70.7% 0.087 259.1)
-
Step 500
500
#608ACC
oklch(63.1% 0.11 259.1)
-
Step 600
600
#4673B9
oklch(55.7% 0.12 258.9)
-
Step 700
700
#3860A0
oklch(49.2% 0.113 259.4)
-
Step 800
800
#2E4E81
oklch(42.5% 0.093 259.3)
-
Step 900
900 (this color)
#273F65
oklch(36.8% 0.072 259.2)
-
Step 950
950
#19273D
oklch(27.2% 0.046 259.2)
#273F65 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) | #2F4267 | 0.015 |
| Deuteranopia (no green cones) | #273C64 | 0.009 |
| Tritanopia (no blue cones) | #00474D | 0.063 |
| Achromatopsia (no color) | #3F3F3F | 0.072 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #273F65
#273F65
oklch(36.8% 0.072 259.2)
- #533A06
#533A06
oklch(36.8% 0.072 79.7)
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 #273F65, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.032
- Twilight Blue #0A437A ΔE 0.040
- Prussian Blue #1D3557 ΔE 0.040
- Marine Blue #01386A ΔE 0.042
- Charcoal #264653 ΔE 0.044
- Dark Blue Grey #1F3B4D ΔE 0.044
- Midnight Green #073B4C ΔE 0.055
- Onyx #343A40 ΔE 0.064
Use #273F65 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.