#0055A9
Closest named color: Dusk Blue (#26538D). oklch(45.7% 0.152 255.2), rgb(0, 85, 169).
Aa
White text reads best on this color (7.31:1).
About this color
#0055A9 is a medium-dark, vivid blue. In OKLCH its lightness is 46%, its chroma 0.152 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.047 away. White text reads best on it, at 7.31:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | vivid (0.152) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.87:1 |
| White text | 7.31:1 |
Values
| HEX | #0055A9 |
| RGB | rgb(0, 85, 169) |
| HSL | hsl(210, 100%, 33%) |
| OKLCH | oklch(45.7% 0.152 255.2) |
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 #0055A9 | 7.31:1 | AAA | Lc -89.6 | Fine for body text |
| Black text on #0055A9 | 2.87:1 | Fails | Lc 19.4 | Dividers and decoration only |
| #0055A9 text on white | 7.31:1 | AAA | Lc 84.6 | Fine for body text |
| #0055A9 text on black | 2.87:1 | Fails | Lc -17.3 | 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
#F0F6FE
oklch(97.1% 0.012 255.5)
-
Step 100
100
#DFEBFB
oklch(93.6% 0.025 255.6)
-
Step 200
200
#C4DBFA
oklch(88.4% 0.05 255.9)
-
Step 300
300
#9AC4FA
oklch(81% 0.089 255)
-
Step 400
400
#60A3F7
oklch(70.8% 0.142 255)
-
Step 500
500
#2D88F4
oklch(63% 0.182 255.5)
-
Step 600
600
#0070DC
oklch(55.6% 0.186 255.4)
-
Step 700
700
#005EBA
oklch(49.1% 0.163 255.3)
-
Step 800
800 (this color)
#0055A9
oklch(45.7% 0.152 255.2)
-
Step 900
900
#07407E
oklch(37.6% 0.118 255.3)
-
Step 950
950
#08264A
oklch(26.9% 0.075 255.4)
#0055A9 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) | #205EAC | 0.031 |
| Deuteranopia (no green cones) | #0050A7 | 0.014 |
| Tritanopia (no blue cones) | #006A77 | 0.114 |
| Achromatopsia (no color) | #565656 | 0.152 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0055A9
#0055A9
oklch(45.7% 0.152 255.2)
- #764E00
#764E00
oklch(45.7% 0.096 75.1)
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 #0055A9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.047
- Cobalt #1E488F ΔE 0.052
- Denim Blue #3B5B92 ΔE 0.058
- Light Navy #155084 ΔE 0.060
- Light Navy Blue #2E5A88 ΔE 0.063
- Deep Sea Blue #015482 ΔE 0.064
- Mid Blue #276AB3 ΔE 0.066
- Peacock Blue #016795 ΔE 0.066
Use #0055A9 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.