#166CA2
Closest named color: Ocean Blue (#03719C). oklch(51% 0.115 242.9), rgb(22, 108, 162).
Aa
White text reads best on this color (5.67:1).
About this color
#166CA2 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 51%, its chroma 0.115 and its hue 243°. Its hue sits on the cool side of the wheel. The nearest named color is Ocean Blue (#03719C), ΔE 0.020 away. White text reads best on it, at 5.67:1.
| Hue family | Blues |
| Lightness | medium-dark (51%) |
| Chroma | moderately saturated (0.115) |
| Temperature | cool |
| Nearest name | Ocean Blue (#03719C) |
| Black text | 3.70:1 |
| White text | 5.67:1 |
Values
| HEX | #166CA2 |
| RGB | rgb(22, 108, 162) |
| HSL | hsl(203, 76%, 36%) |
| OKLCH | oklch(51% 0.115 242.9) |
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 #166CA2 | 5.67:1 | AA | Lc -83.2 | Fine for body text |
| Black text on #166CA2 | 3.70:1 | AA large text | Lc 26.1 | Dividers and decoration only |
| #166CA2 text on white | 5.67:1 | AA | Lc 77.9 | Fine for body text |
| #166CA2 text on black | 3.70:1 | AA large text | Lc -23.8 | 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 700.
-
Step 50
50
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#E1EBF4
oklch(93.5% 0.016 245.1)
-
Step 200
200
#C8DCEC
oklch(88.4% 0.031 242)
-
Step 300
300
#A2C6E2
oklch(81% 0.055 241.8)
-
Step 400
400
#6EA7D4
oklch(70.7% 0.089 243.3)
-
Step 500
500
#4491C8
oklch(63.2% 0.112 242.5)
-
Step 600
600
#1D7AB5
oklch(55.7% 0.123 242.8)
-
Step 700
700 (this color)
#166CA2
oklch(51% 0.115 242.9)
-
Step 800
800
#10547E
oklch(42.8% 0.094 242.3)
-
Step 900
900
#174565
oklch(37.6% 0.074 242.9)
-
Step 950
950
#0F293B
oklch(27% 0.046 241.6)
#166CA2 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) | #526EA4 | 0.052 |
| Deuteranopia (no green cones) | #3F61A1 | 0.039 |
| Tritanopia (no blue cones) | #00797F | 0.078 |
| Achromatopsia (no color) | #676767 | 0.115 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #166CA2
#166CA2
oklch(51% 0.115 242.9)
- #935505
#935505
oklch(51% 0.114 63.1)
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 #166CA2, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Ocean Blue #03719C ΔE 0.020
- Peacock Blue #016795 ΔE 0.026
- Mid Blue #276AB3 ΔE 0.031
- Muted Blue #3B719F ΔE 0.032
- Sea Blue #047495 ΔE 0.036
- Flat Blue #3C73A8 ΔE 0.036
- French Blue #436BAD ΔE 0.039
- Denim #3B638C ΔE 0.042
Use #166CA2 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.