#166EC0
Closest named color: Mid Blue (#276AB3). oklch(53.4% 0.15 252.2), rgb(22, 110, 192).
Aa
White text reads best on this color (5.21:1).
About this color
#166EC0 is a medium-dark, vivid blue. In OKLCH its lightness is 53%, its chroma 0.150 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.022 away. White text reads best on it, at 5.21:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | vivid (0.150) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 4.02:1 |
| White text | 5.21:1 |
Values
| HEX | #166EC0 |
| RGB | rgb(22, 110, 192) |
| HSL | hsl(209, 79%, 42%) |
| OKLCH | oklch(53.4% 0.15 252.2) |
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 #166EC0 | 5.21:1 | AA | Lc -80.7 | Fine for body text |
| Black text on #166EC0 | 4.02:1 | AA large text | Lc 28.8 | Dividers and decoration only |
| #166EC0 text on white | 5.21:1 | AA | Lc 75.3 | Fine for body text |
| #166EC0 text on black | 4.02:1 | AA large text | Lc -26.4 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E1EBF7
oklch(93.6% 0.019 252.9)
-
Step 200
200
#C8DBF2
oklch(88.4% 0.038 253.2)
-
Step 300
300
#A2C4EC
oklch(80.9% 0.068 252.7)
-
Step 400
400
#6EA4E2
oklch(70.6% 0.108 252.7)
-
Step 500
500
#448CDA
oklch(63% 0.138 252.5)
-
Step 600
600 (this color)
#166EC0
oklch(53.4% 0.15 252.2)
-
Step 700
700
#1062AC
oklch(49.2% 0.138 251.9)
-
Step 800
800
#13508C
oklch(42.7% 0.116 252.4)
-
Step 900
900
#18436F
oklch(37.7% 0.089 251.8)
-
Step 950
950
#0F2741
oklch(26.8% 0.057 252.3)
#166EC0 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) | #4474C3 | 0.039 |
| Deuteranopia (no green cones) | #2366BE | 0.021 |
| Tritanopia (no blue cones) | #00828D | 0.111 |
| Achromatopsia (no color) | #6C6C6C | 0.150 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #166EC0
#166EC0
oklch(53.4% 0.15 252.2)
- #956000
#956000
oklch(53.4% 0.114 72)
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 #166EC0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.022
- Windows Blue #3778BF ΔE 0.038
- French Blue #436BAD ΔE 0.040
- Nice Blue #107AB0 ΔE 0.046
- Flat Blue #3C73A8 ΔE 0.049
- Muted Blue #3B719F ΔE 0.058
- Ocean Blue #03719C ΔE 0.061
- Royal Blue #4169E1 ΔE 0.062
Use #166EC0 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.