#0051A4
Closest named color: Cobalt (#1E488F). oklch(44.4% 0.15 255.7), rgb(0, 81, 164).
Aa
White text reads best on this color (7.74:1).
About this color
#0051A4 is a dark, vivid blue. In OKLCH its lightness is 44%, its chroma 0.150 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.040 away. White text reads best on it, at 7.74:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | vivid (0.150) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.71:1 |
| White text | 7.74:1 |
Values
| HEX | #0051A4 |
| RGB | rgb(0, 81, 164) |
| HSL | hsl(210, 100%, 32%) |
| OKLCH | oklch(44.4% 0.15 255.7) |
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 #0051A4 | 7.74:1 | AAA | Lc -90.9 | Preferred for body text |
| Black text on #0051A4 | 2.71:1 | Fails | Lc 17.9 | Dividers and decoration only |
| #0051A4 text on white | 7.74:1 | AAA | Lc 86.1 | Fine for body text |
| #0051A4 text on black | 2.71:1 | Fails | Lc -15.9 | 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
#DFEBFB
oklch(93.6% 0.025 255.6)
-
Step 200
200
#C4DBFA
oklch(88.4% 0.05 255.9)
-
Step 300
300
#9BC3F9
oklch(80.8% 0.088 256.1)
-
Step 400
400
#62A2F6
oklch(70.6% 0.14 255.8)
-
Step 500
500
#3188F3
oklch(63.1% 0.18 255.9)
-
Step 600
600
#0070DD
oklch(55.6% 0.187 255.6)
-
Step 700
700
#005EBC
oklch(49.2% 0.166 255.7)
-
Step 800
800 (this color)
#0051A4
oklch(44.4% 0.15 255.7)
-
Step 900
900
#0B407E
oklch(37.7% 0.118 256)
-
Step 950
950
#09264A
oklch(27% 0.075 255.8)
#0051A4 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) | #1A5AA7 | 0.029 |
| Deuteranopia (no green cones) | #004CA2 | 0.014 |
| Tritanopia (no blue cones) | #006572 | 0.112 |
| Achromatopsia (no color) | #535353 | 0.150 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0051A4
#0051A4
oklch(44.4% 0.15 255.7)
- #714B00
#714B00
oklch(44.4% 0.093 75.6)
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 #0051A4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.040
- Dusk Blue #26538D ΔE 0.042
- Light Navy #155084 ΔE 0.052
- Deep Sea Blue #015482 ΔE 0.058
- Denim Blue #3B5B92 ΔE 0.061
- Sapphire #2138AB ΔE 0.061
- Light Navy Blue #2E5A88 ΔE 0.062
- Blue Blue #2242C7 ΔE 0.068
Use #0051A4 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.