#166BA1
Closest named color: Ocean Blue (#03719C). oklch(50.7% 0.114 243.2), rgb(22, 107, 161).
Aa
White text reads best on this color (5.75:1).
About this color
#166BA1 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 51%, its chroma 0.114 and its hue 243°. Its hue sits on the cool side of the wheel. The nearest named color is Ocean Blue (#03719C), ΔE 0.021 away. White text reads best on it, at 5.75:1.
| Hue family | Blues |
| Lightness | medium-dark (51%) |
| Chroma | moderately saturated (0.114) |
| Temperature | cool |
| Nearest name | Ocean Blue (#03719C) |
| Black text | 3.65:1 |
| White text | 5.75:1 |
Values
| HEX | #166BA1 |
| RGB | rgb(22, 107, 161) |
| HSL | hsl(203, 76%, 36%) |
| OKLCH | oklch(50.7% 0.114 243.2) |
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 #166BA1 | 5.75:1 | AA | Lc -83.6 | Fine for body text |
| Black text on #166BA1 | 3.65:1 | AA large text | Lc 25.7 | Dividers and decoration only |
| #166BA1 text on white | 5.75:1 | AA | Lc 78.3 | Fine for body text |
| #166BA1 text on black | 3.65:1 | AA large text | Lc -23.5 | 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
#C9DCEC
oklch(88.5% 0.03 243.4)
-
Step 300
300
#A3C5E2
oklch(80.8% 0.055 244.3)
-
Step 400
400
#6FA7D4
oklch(70.7% 0.089 243.7)
-
Step 500
500
#4490C8
oklch(63% 0.113 243.3)
-
Step 600
600
#1E7AB5
oklch(55.7% 0.123 242.9)
-
Step 700
700 (this color)
#166BA1
oklch(50.7% 0.114 243.2)
-
Step 800
800
#11547E
oklch(42.8% 0.094 242.5)
-
Step 900
900
#184565
oklch(37.6% 0.073 243.3)
-
Step 950
950
#10293B
oklch(27.1% 0.046 242.4)
#166BA1 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) | #516DA3 | 0.051 |
| Deuteranopia (no green cones) | #3E60A0 | 0.039 |
| Tritanopia (no blue cones) | #00787E | 0.078 |
| Achromatopsia (no color) | #666666 | 0.114 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #166BA1
#166BA1
oklch(50.7% 0.114 243.2)
- #925403
#925403
oklch(50.7% 0.114 63)
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 #166BA1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Ocean Blue #03719C ΔE 0.021
- Peacock Blue #016795 ΔE 0.023
- Mid Blue #276AB3 ΔE 0.032
- Muted Blue #3B719F ΔE 0.033
- Sea Blue #047495 ΔE 0.037
- Flat Blue #3C73A8 ΔE 0.039
- French Blue #436BAD ΔE 0.040
- Denim #3B638C ΔE 0.040
Use #166BA1 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.