#0A66E5
Closest named color: Azul (#1D5DEC). oklch(54.2% 0.208 259.4), rgb(10, 102, 229).
Aa
White text reads best on this color (5.19:1).
About this color
#0A66E5 is a medium-dark, vivid blue. In OKLCH its lightness is 54%, its chroma 0.208 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Azul (#1D5DEC), ΔE 0.023 away. White text reads best on it, at 5.19:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | vivid (0.208) |
| Temperature | cool |
| Nearest name | Azul (#1D5DEC) |
| Black text | 4.04:1 |
| White text | 5.19:1 |
Values
| HEX | #0A66E5 |
| RGB | rgb(10, 102, 229) |
| HSL | hsl(215, 92%, 47%) |
| OKLCH | oklch(54.2% 0.208 259.4) |
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 #0A66E5 | 5.19:1 | AA | Lc -80.3 | Fine for body text |
| Black text on #0A66E5 | 4.04:1 | AA large text | Lc 29.2 | Dividers and decoration only |
| #0A66E5 text on white | 5.19:1 | AA | Lc 74.9 | Content text, not long reading |
| #0A66E5 text on black | 4.04:1 | AA large text | Lc -26.8 | 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 600.
-
Step 50
50
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#DFEBFD
oklch(93.6% 0.028 258.4)
-
Step 200
200
#C5DBFC
oklch(88.6% 0.051 258.4)
-
Step 300
300
#9DC2FD
oklch(80.9% 0.093 259.6)
-
Step 400
400
#66A0FD
oklch(70.7% 0.15 259.4)
-
Step 500
500
#3A85FB
oklch(63.2% 0.191 259.3)
-
Step 600
600 (this color)
#0A66E5
oklch(54.2% 0.208 259.4)
-
Step 700
700
#0158CB
oklch(49.2% 0.193 259.3)
-
Step 800
800
#0848A4
oklch(42.6% 0.16 259.4)
-
Step 900
900
#123E82
oklch(37.7% 0.124 259.3)
-
Step 950
950
#0C254C
oklch(27% 0.079 259.2)
#0A66E5 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) | #0076E9 | 0.040 |
| Deuteranopia (no green cones) | #0064E3 | 0.007 |
| Tritanopia (no blue cones) | #00869B | 0.158 |
| Achromatopsia (no color) | #6D6D6D | 0.208 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0A66E5
#0A66E5
oklch(54.2% 0.208 259.4)
- #926600
#926600
oklch(54.2% 0.113 79)
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 #0A66E5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Azul #1D5DEC ΔE 0.023
- Cerulean Blue #056EEE ΔE 0.023
- Bright Blue #0165FC ΔE 0.035
- Royal Blue #4169E1 ΔE 0.036
- Neon Blue #4361EE ΔE 0.038
- Warm Blue #4B57DB ΔE 0.053
- Electric Blue #0652FF ΔE 0.058
- Clear Blue #247AFD ΔE 0.063
Use #0A66E5 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.