#273F58
Closest named color: Dark Grey Blue (#29465B). oklch(36% 0.053 250.4), rgb(39, 63, 88).
Aa
White text reads best on this color (10.83:1).
About this color
#273F58 is a dark, muted blue. In OKLCH its lightness is 36%, its chroma 0.053 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.023 away. White text reads best on it, at 10.83:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | muted (0.053) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 1.93:1 |
| White text | 10.83:1 |
Values
| HEX | #273F58 |
| RGB | rgb(39, 63, 88) |
| HSL | hsl(211, 39%, 25%) |
| OKLCH | oklch(36% 0.053 250.4) |
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 #273F58 | 10.83:1 | AAA | Lc -98.9 | Preferred for body text |
| Black text on #273F58 | 1.93:1 | Fails | Lc 8.9 | Not readable |
| #273F58 text on white | 10.83:1 | AAA | Lc 95.0 | Preferred for body text |
| #273F58 text on black | 1.93:1 | Fails | Lc -7.6 | 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
#F3F6F9
oklch(97.2% 0.005 247.9)
-
Step 100
100
#E4EBF1
oklch(93.6% 0.011 243.7)
-
Step 200
200
#CFDBE8
oklch(88.6% 0.022 250.2)
-
Step 300
300
#AEC3DA
oklch(80.9% 0.04 250.7)
-
Step 400
400
#83A4C7
oklch(70.7% 0.063 250.2)
-
Step 500
500
#638DB9
oklch(63% 0.081 250.3)
-
Step 600
600
#4A77A5
oklch(55.7% 0.088 250.2)
-
Step 700
700
#3B648E
oklch(49.2% 0.082 250.4)
-
Step 800
800
#315173
oklch(42.6% 0.068 251.1)
-
Step 900
900 (this color)
#273F58
oklch(36% 0.053 250.4)
-
Step 950
950
#1A2836
oklch(27.1% 0.032 249.1)
#273F58 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) | #354059 | 0.020 |
| Deuteranopia (no green cones) | #2F3B58 | 0.016 |
| Tritanopia (no blue cones) | #0E4548 | 0.046 |
| Achromatopsia (no color) | #3D3D3D | 0.053 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #273F58
#273F58
oklch(36% 0.053 250.4)
- #4F381C
#4F381C
oklch(36% 0.053 70.2)
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 #273F58, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.023
- Dark Blue Grey #1F3B4D ΔE 0.024
- Charcoal #264653 ΔE 0.027
- Prussian Blue #1D3557 ΔE 0.036
- Midnight Green #073B4C ΔE 0.039
- Onyx #343A40 ΔE 0.042
- Charcoal Grey #3C4142 ΔE 0.049
- Gunmetal #293241 ΔE 0.051
Use #273F58 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.