#263F64
Closest named color: Dark Grey Blue (#29465B). oklch(36.6% 0.071 258), rgb(38, 63, 100).
Aa
White text reads best on this color (10.61:1).
About this color
#263F64 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.071 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.031 away. White text reads best on it, at 10.61:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.071) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 1.97:1 |
| White text | 10.61:1 |
Values
| HEX | #263F64 |
| RGB | rgb(38, 63, 100) |
| HSL | hsl(216, 45%, 27%) |
| OKLCH | oklch(36.6% 0.071 258) |
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 #263F64 | 10.61:1 | AAA | Lc -98.5 | Preferred for body text |
| Black text on #263F64 | 1.97:1 | Fails | Lc 9.4 | Not readable |
| #263F64 text on white | 10.61:1 | AAA | Lc 94.5 | Preferred for body text |
| #263F64 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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E4EAF4
oklch(93.5% 0.015 260.7)
-
Step 200
200
#CDDAED
oklch(88.4% 0.03 257.8)
-
Step 300
300
#ACC2E4
oklch(80.9% 0.054 259)
-
Step 400
400
#7FA2D6
oklch(70.6% 0.086 258.1)
-
Step 500
500
#5F8ACB
oklch(63% 0.11 258.4)
-
Step 600
600
#4573B8
oklch(55.5% 0.119 258.3)
-
Step 700
700
#36609F
oklch(49% 0.112 258.3)
-
Step 800
800
#2D4F80
oklch(42.7% 0.091 257.6)
-
Step 900
900 (this color)
#263F64
oklch(36.6% 0.071 258)
-
Step 950
950
#18273C
oklch(27% 0.044 256.9)
#263F64 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) | #304266 | 0.017 |
| Deuteranopia (no green cones) | #283C63 | 0.009 |
| Tritanopia (no blue cones) | #00474C | 0.062 |
| Achromatopsia (no color) | #3E3E3E | 0.071 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #263F64
#263F64
oklch(36.6% 0.071 258)
- #533908
#533908
oklch(36.5% 0.071 77.6)
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 #263F64, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.031
- Prussian Blue #1D3557 ΔE 0.039
- Twilight Blue #0A437A ΔE 0.041
- Marine Blue #01386A ΔE 0.041
- Dark Blue Grey #1F3B4D ΔE 0.042
- Charcoal #264653 ΔE 0.042
- Midnight Green #073B4C ΔE 0.053
- Onyx #343A40 ΔE 0.062
Use #263F64 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.