#00439C
Closest named color: Cobalt (#1E488F). oklch(40.7% 0.157 258.9), rgb(0, 67, 156).
Aa
White text reads best on this color (9.19:1).
About this color
#00439C is a dark, vivid blue. In OKLCH its lightness is 41%, its chroma 0.157 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.031 away. White text reads best on it, at 9.19:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | vivid (0.157) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.28:1 |
| White text | 9.19:1 |
Values
| HEX | #00439C |
| RGB | rgb(0, 67, 156) |
| HSL | hsl(214, 100%, 31%) |
| OKLCH | oklch(40.7% 0.157 258.9) |
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 #00439C | 9.19:1 | AAA | Lc -94.8 | Preferred for body text |
| Black text on #00439C | 2.28:1 | Fails | Lc 13.6 | Not readable |
| #00439C text on white | 9.19:1 | AAA | Lc 90.4 | Preferred for body text |
| #00439C text on black | 2.28:1 | Fails | Lc -11.9 | 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 800.
-
Step 50
50
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#DFEBFC
oklch(93.6% 0.026 257)
-
Step 200
200
#C5DBFC
oklch(88.6% 0.051 258.4)
-
Step 300
300
#9DC2FC
oklch(80.8% 0.092 259.2)
-
Step 400
400
#66A0FB
oklch(70.6% 0.147 259.1)
-
Step 500
500
#3A85F8
oklch(63% 0.187 259)
-
Step 600
600
#116BE7
oklch(55.5% 0.204 258.9)
-
Step 700
700
#0059C9
oklch(49.2% 0.189 258.8)
-
Step 800
800 (this color)
#00439C
oklch(40.7% 0.157 258.9)
-
Step 900
900
#123E81
oklch(37.6% 0.123 259.1)
-
Step 950
950
#0C254B
oklch(26.9% 0.077 258.8)
#00439C 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) | #004E9F | 0.030 |
| Deuteranopia (no green cones) | #00419A | 0.006 |
| Tritanopia (no blue cones) | #005A68 | 0.120 |
| Achromatopsia (no color) | #484848 | 0.157 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #00439C
#00439C
oklch(40.7% 0.157 258.9)
- #624300
#624300
oklch(40.7% 0.085 78.8)
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 #00439C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.031
- Sapphire #2138AB ΔE 0.038
- Twilight Blue #0A437A ΔE 0.057
- Light Navy #155084 ΔE 0.059
- Dusk Blue #26538D ΔE 0.061
- Blueberry #464196 ΔE 0.065
- Deep Sea Blue #015482 ΔE 0.069
- Blue Blue #2242C7 ΔE 0.073
Use #00439C 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.