#0C51A6
Closest named color: Cobalt (#1E488F). oklch(44.8% 0.151 257.3), rgb(12, 81, 166).
Aa
White text reads best on this color (7.65:1).
About this color
#0C51A6 is a dark, vivid blue. In OKLCH its lightness is 45%, its chroma 0.151 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.042 away. White text reads best on it, at 7.65:1.
| Hue family | Blues |
| Lightness | dark (45%) |
| Chroma | vivid (0.151) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.74:1 |
| White text | 7.65:1 |
Values
| HEX | #0C51A6 |
| RGB | rgb(12, 81, 166) |
| HSL | hsl(213, 87%, 35%) |
| OKLCH | oklch(44.8% 0.151 257.3) |
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 #0C51A6 | 7.65:1 | AAA | Lc -90.8 | Preferred for body text |
| Black text on #0C51A6 | 2.74:1 | Fails | Lc 18.1 | Dividers and decoration only |
| #0C51A6 text on white | 7.65:1 | AAA | Lc 86.0 | Fine for body text |
| #0C51A6 text on black | 2.74:1 | Fails | Lc -16.1 | 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
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#DFEBFB
oklch(93.6% 0.025 255.6)
-
Step 200
200
#C5DBFA
oklch(88.5% 0.049 256.9)
-
Step 300
300
#9CC3FA
oklch(80.9% 0.089 257)
-
Step 400
400
#65A1F7
oklch(70.6% 0.141 257.5)
-
Step 500
500
#3787F4
oklch(63.1% 0.181 257.3)
-
Step 600
600
#066EE3
oklch(55.7% 0.196 257.2)
-
Step 700
700
#005BC1
oklch(49% 0.176 257.3)
-
Step 800
800 (this color)
#0C51A6
oklch(44.8% 0.151 257.3)
-
Step 900
900
#103F7E
oklch(37.6% 0.118 257.5)
-
Step 950
950
#0B264A
oklch(27.1% 0.074 256.8)
#0C51A6 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) | #185AA9 | 0.027 |
| Deuteranopia (no green cones) | #004DA4 | 0.013 |
| Tritanopia (no blue cones) | #006673 | 0.115 |
| Achromatopsia (no color) | #535353 | 0.151 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0C51A6
#0C51A6
oklch(44.8% 0.151 257.3)
- #714D00
#714D00
oklch(44.8% 0.094 77.8)
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 #0C51A6, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.042
- Dusk Blue #26538D ΔE 0.044
- Light Navy #155084 ΔE 0.056
- Denim Blue #3B5B92 ΔE 0.060
- Sapphire #2138AB ΔE 0.061
- Deep Sea Blue #015482 ΔE 0.062
- Light Navy Blue #2E5A88 ΔE 0.063
- Blue Blue #2242C7 ΔE 0.064
Use #0C51A6 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.