#040273
Named color: Deep Blue. oklch(25.5% 0.171 265.6), rgb(4, 2, 115).
Aa
White text reads best on this color (16.64:1).
About this color
#040273 is a dark, vivid blue. In OKLCH its lightness is 25%, its chroma 0.171 and its hue 266°. Its hue sits on the cool side of the wheel. It is the named color Deep Blue. White text reads best on it, at 16.64:1.
| Hue family | Blues |
| Lightness | dark (25%) |
| Chroma | vivid (0.171) |
| Temperature | cool |
| Nearest name | Deep Blue |
| Black text | 1.26:1 |
| White text | 16.64:1 |
Values
| HEX | #040273 |
| RGB | rgb(4, 2, 115) |
| HSL | hsl(241, 97%, 23%) |
| OKLCH | oklch(25.5% 0.171 265.6) |
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 #040273 | 16.64:1 | AAA | Lc -104.7 | Preferred for body text |
| Black text on #040273 | 1.26:1 | Fails | Lc 0.0 | Not readable |
| #040273 text on white | 16.64:1 | AAA | Lc 101.9 | Preferred for body text |
| #040273 text on black | 1.26:1 | Fails | Lc 0.0 | 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 950.
-
Step 50
50
#F1F6FF
oklch(97.2% 0.013 262.4)
-
Step 100
100
#E0EAFF
oklch(93.6% 0.03 265.3)
-
Step 200
200
#C8D9FF
oklch(88.5% 0.056 266.2)
-
Step 300
300
#A3C0FF
oklch(80.9% 0.095 265.2)
-
Step 400
400
#739CFF
oklch(70.7% 0.152 265.7)
-
Step 500
500
#4F7FFF
oklch(63.1% 0.197 265.6)
-
Step 600
600
#2D5EFF
oklch(55.6% 0.244 265.5)
-
Step 700
700
#1736FF
oklch(49.2% 0.286 265.6)
-
Step 800
800
#1200EA
oklch(42.7% 0.291 265.6)
-
Step 900
900
#0D00C6
oklch(37.6% 0.257 265.6)
-
Step 950
950 (this color)
#040273
oklch(25.5% 0.171 265.6)
#040273 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) | #002476 | 0.057 |
| Deuteranopia (no green cones) | #001871 | 0.029 |
| Tritanopia (no blue cones) | #002D41 | 0.128 |
| Achromatopsia (no color) | #1E1E1E | 0.172 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #040273
#040273
oklch(25.5% 0.171 265.6)
- #2E2000
#2E2000
oklch(25.4% 0.052 84.7)
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 #040273, closest first.
No curated palette has a color within ΔE 0.04 of #040273.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Royal Blue #02066F ΔE 0.007
- Navy #000080 ΔE 0.024
- Darkblue #030764 ΔE 0.027
- Dark Blue #00008B ΔE 0.044
- Midnight Blue #191970 ΔE 0.047
- Royal #0C1793 ΔE 0.071
- Dark Indigo #1F0954 ΔE 0.073
- Navy Blue #001146 ΔE 0.082
Use #040273 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.