#00539E
Closest named color: Dusk Blue (#26538D). oklch(44.5% 0.14 253.6), rgb(0, 83, 158).
Aa
White text reads best on this color (7.68:1).
About this color
#00539E is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.140 and its hue 254°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.032 away. White text reads best on it, at 7.68:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.140) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.73:1 |
| White text | 7.68:1 |
Values
| HEX | #00539E |
| RGB | rgb(0, 83, 158) |
| HSL | hsl(208, 100%, 31%) |
| OKLCH | oklch(44.5% 0.14 253.6) |
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 #00539E | 7.68:1 | AAA | Lc -90.8 | Preferred for body text |
| Black text on #00539E | 2.73:1 | Fails | Lc 18.0 | Dividers and decoration only |
| #00539E text on white | 7.68:1 | AAA | Lc 86.0 | Fine for body text |
| #00539E text on black | 2.73:1 | Fails | Lc -16.0 | Dividers and decoration only |
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
#F0F6FD
oklch(97.1% 0.011 252.1)
-
Step 100
100
#DFEBFA
oklch(93.6% 0.024 254)
-
Step 200
200
#C5DBF7
oklch(88.4% 0.045 254.5)
-
Step 300
300
#9CC4F5
oklch(80.9% 0.082 253.8)
-
Step 400
400
#63A4F0
oklch(70.8% 0.131 253.4)
-
Step 500
500
#328AEB
oklch(63% 0.168 253.8)
-
Step 600
600
#0072D6
oklch(55.6% 0.176 253.8)
-
Step 700
700
#0060B5
oklch(49.2% 0.155 253.6)
-
Step 800
800 (this color)
#00539E
oklch(44.5% 0.14 253.6)
-
Step 900
900
#0B4279
oklch(37.8% 0.108 253.2)
-
Step 950
950
#0A2747
oklch(27.1% 0.069 253.6)
#00539E 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) | #285AA1 | 0.032 |
| Deuteranopia (no green cones) | #004D9D | 0.017 |
| Tritanopia (no blue cones) | #006571 | 0.102 |
| Achromatopsia (no color) | #535353 | 0.140 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #00539E
#00539E
oklch(44.5% 0.14 253.6)
- #724A00
#724A00
oklch(44.3% 0.094 73.8)
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 #00539E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.032
- Cobalt #1E488F ΔE 0.037
- Light Navy #155084 ΔE 0.042
- Deep Sea Blue #015482 ΔE 0.047
- Light Navy Blue #2E5A88 ΔE 0.052
- Denim Blue #3B5B92 ΔE 0.053
- Peacock Blue #016795 ΔE 0.063
- Blueberry #464196 ΔE 0.069
Use #00539E 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.