#00559A
Closest named color: Dusk Blue (#26538D). oklch(44.6% 0.132 251.6), rgb(0, 85, 154).
Aa
White text reads best on this color (7.59:1).
About this color
#00559A is a dark, moderately saturated blue. In OKLCH its lightness is 45%, its chroma 0.132 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.026 away. White text reads best on it, at 7.59:1.
| Hue family | Blues |
| Lightness | dark (45%) |
| Chroma | moderately saturated (0.132) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.76:1 |
| White text | 7.59:1 |
Values
| HEX | #00559A |
| RGB | rgb(0, 85, 154) |
| HSL | hsl(207, 100%, 30%) |
| OKLCH | oklch(44.6% 0.132 251.6) |
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 #00559A | 7.59:1 | AAA | Lc -90.6 | Preferred for body text |
| Black text on #00559A | 2.76:1 | Fails | Lc 18.3 | Dividers and decoration only |
| #00559A text on white | 7.59:1 | AAA | Lc 85.7 | Fine for body text |
| #00559A text on black | 2.76:1 | Fails | Lc -16.3 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#DFEBF9
oklch(93.5% 0.023 252.2)
-
Step 200
200
#C5DCF5
oklch(88.5% 0.042 250.5)
-
Step 300
300
#9CC5F2
oklch(81% 0.078 251.1)
-
Step 400
400
#64A5EB
oklch(70.8% 0.123 251.6)
-
Step 500
500
#328CE5
oklch(63.1% 0.158 251.7)
-
Step 600
600
#0074CF
oklch(55.5% 0.165 251.7)
-
Step 700
700
#0062AF
oklch(49.2% 0.144 251.3)
-
Step 800
800 (this color)
#00559A
oklch(44.6% 0.132 251.6)
-
Step 900
900
#0B4376
oklch(37.8% 0.103 251.4)
-
Step 950
950
#0A2745
oklch(26.9% 0.066 252.2)
#00559A 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) | #305B9D | 0.036 |
| Deuteranopia (no green cones) | #0E4E99 | 0.019 |
| Tritanopia (no blue cones) | #006670 | 0.097 |
| Achromatopsia (no color) | #545454 | 0.132 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #00559A
#00559A
oklch(44.6% 0.132 251.6)
- #754A00
#754A00
oklch(44.8% 0.096 71.6)
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 #00559A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.026
- Light Navy #155084 ΔE 0.037
- Cobalt #1E488F ΔE 0.038
- Deep Sea Blue #015482 ΔE 0.040
- Light Navy Blue #2E5A88 ΔE 0.044
- Denim Blue #3B5B92 ΔE 0.048
- Peacock Blue #016795 ΔE 0.056
- Dusky Blue #475F94 ΔE 0.066
Use #00559A 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.