#05438F
Closest named color: Cobalt (#1E488F). oklch(39.6% 0.139 257.5), rgb(5, 67, 143).
Aa
White text reads best on this color (9.51:1).
About this color
#05438F is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.139 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.022 away. White text reads best on it, at 9.51:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.139) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.20:1 |
| White text | 9.51:1 |
Values
| HEX | #05438F |
| RGB | rgb(5, 67, 143) |
| HSL | hsl(213, 93%, 29%) |
| OKLCH | oklch(39.6% 0.139 257.5) |
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 #05438F | 9.51:1 | AAA | Lc -95.7 | Preferred for body text |
| Black text on #05438F | 2.20:1 | Fails | Lc 12.6 | Not readable |
| #05438F text on white | 9.51:1 | AAA | Lc 91.4 | Preferred for body text |
| #05438F text on black | 2.20:1 | Fails | Lc -11.0 | 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 900.
-
Step 50
50
#F0F6FF
oklch(97.1% 0.014 258.3)
-
Step 100
100
#DEEBFE
oklch(93.6% 0.029 257.8)
-
Step 200
200
#C2DBFF
oklch(88.5% 0.057 257.5)
-
Step 300
300
#99C3FF
oklch(80.9% 0.097 257.3)
-
Step 400
400
#5FA1FF
oklch(70.7% 0.154 257.4)
-
Step 500
500
#2A85FF
oklch(63.1% 0.2 257.6)
-
Step 600
600
#006DE6
oklch(55.7% 0.202 257.5)
-
Step 700
700
#005BC2
oklch(49% 0.177 257.5)
-
Step 800
800
#004AA1
oklch(42.6% 0.155 257.6)
-
Step 900
900 (this color)
#05438F
oklch(39.6% 0.139 257.5)
-
Step 950
950
#052550
oklch(27.1% 0.087 257.4)
#05438F 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) | #0A4C92 | 0.026 |
| Deuteranopia (no green cones) | #00408E | 0.009 |
| Tritanopia (no blue cones) | #005662 | 0.105 |
| Achromatopsia (no color) | #454545 | 0.139 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #05438F
#05438F
oklch(39.6% 0.139 257.5)
- #5F4000
#5F4000
oklch(39.7% 0.083 77.7)
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 #05438F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.022
- Twilight Blue #0A437A ΔE 0.035
- Light Navy #155084 ΔE 0.046
- Dusk Blue #26538D ΔE 0.055
- Sapphire #2138AB ΔE 0.055
- Deep Sea Blue #015482 ΔE 0.057
- Blueberry #464196 ΔE 0.066
- Dark Slate Blue #483D8B ΔE 0.069
Use #05438F 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.