#263F85
Closest named color: Cobalt (#1E488F). oklch(39% 0.121 266.1), rgb(38, 63, 133).
Aa
White text reads best on this color (9.84:1).
About this color
#263F85 is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.121 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.028 away. White text reads best on it, at 9.84:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.121) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.13:1 |
| White text | 9.84:1 |
Values
| HEX | #263F85 |
| RGB | rgb(38, 63, 133) |
| HSL | hsl(224, 56%, 34%) |
| OKLCH | oklch(39% 0.121 266.1) |
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 #263F85 | 9.84:1 | AAA | Lc -96.7 | Preferred for body text |
| Black text on #263F85 | 2.13:1 | Fails | Lc 11.4 | Not readable |
| #263F85 text on white | 9.84:1 | AAA | Lc 92.5 | Preferred for body text |
| #263F85 text on black | 2.13:1 | Fails | Lc -9.9 | 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
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E2EAFC
oklch(93.6% 0.026 266.6)
-
Step 200
200
#CAD9FC
oklch(88.5% 0.051 267)
-
Step 300
300
#A5C0FC
oklch(80.9% 0.09 265.7)
-
Step 400
400
#769CFB
oklch(70.7% 0.146 266.3)
-
Step 500
500
#5480F9
oklch(63.1% 0.187 266.1)
-
Step 600
600
#3B66E8
oklch(55.7% 0.203 266)
-
Step 700
700
#2E53C9
oklch(49% 0.188 266.1)
-
Step 800
800
#2645A3
oklch(42.7% 0.156 266)
-
Step 900
900 (this color)
#263F85
oklch(39% 0.121 266.1)
-
Step 950
950
#15234C
oklch(27% 0.078 266.9)
#263F85 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) | #144888 | 0.027 |
| Deuteranopia (no green cones) | #003F84 | 0.026 |
| Tritanopia (no blue cones) | #00505B | 0.100 |
| Achromatopsia (no color) | #434343 | 0.122 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #263F85
#263F85
oklch(39% 0.121 266.1)
- #584100
#584100
oklch(39% 0.08 85.7)
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 #263F85, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.028
- Twilight Blue #0A437A ΔE 0.031
- Light Navy #155084 ΔE 0.049
- Dark Slate Blue #483D8B ΔE 0.049
- Blueberry #464196 ΔE 0.054
- Dusk Blue #26538D ΔE 0.057
- Marine Blue #01386A ΔE 0.060
- Deep Sea Blue #015482 ΔE 0.062
Use #263F85 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.