#166ABE
Closest named color: Mid Blue (#276AB3). oklch(52.3% 0.152 253.4), rgb(22, 106, 190).
Aa
White text reads best on this color (5.46:1).
About this color
#166ABE is a medium-dark, vivid blue. In OKLCH its lightness is 52%, its chroma 0.152 and its hue 253°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.019 away. White text reads best on it, at 5.46:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.152) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.83:1 |
| White text | 5.46:1 |
Values
| HEX | #166ABE |
| RGB | rgb(22, 106, 190) |
| HSL | hsl(210, 79%, 42%) |
| OKLCH | oklch(52.3% 0.152 253.4) |
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 #166ABE | 5.46:1 | AA | Lc -82.1 | Fine for body text |
| Black text on #166ABE | 3.83:1 | AA large text | Lc 27.3 | Dividers and decoration only |
| #166ABE text on white | 5.46:1 | AA | Lc 76.7 | Fine for body text |
| #166ABE text on black | 3.83:1 | AA large text | Lc -25.0 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E0EBF8
oklch(93.6% 0.021 252.5)
-
Step 200
200
#C7DBF4
oklch(88.4% 0.041 254)
-
Step 300
300
#A0C4F0
oklch(81% 0.074 253.7)
-
Step 400
400
#6AA4E8
oklch(70.7% 0.117 253.3)
-
Step 500
500
#3F8BE1
oklch(63% 0.15 253.6)
-
Step 600
600
#1673CF
oklch(55.5% 0.163 253.5)
-
Step 700
700 (this color)
#166ABE
oklch(52.3% 0.152 253.4)
-
Step 800
800
#0B4F91
oklch(42.7% 0.125 253.3)
-
Step 900
900
#144274
oklch(37.7% 0.099 253.5)
-
Step 950
950
#0E2744
oklch(27% 0.062 253.9)
#166ABE 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) | #3E71C1 | 0.036 |
| Deuteranopia (no green cones) | #1963BC | 0.019 |
| Tritanopia (no blue cones) | #007E8B | 0.111 |
| Achromatopsia (no color) | #696969 | 0.152 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #166ABE
#166ABE
oklch(52.3% 0.152 253.4)
- #905E00
#905E00
oklch(52.4% 0.111 73.2)
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 #166ABE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.019
- French Blue #436BAD ΔE 0.041
- Windows Blue #3778BF ΔE 0.047
- Flat Blue #3C73A8 ΔE 0.054
- Nice Blue #107AB0 ΔE 0.054
- Muted Blue #3B719F ΔE 0.061
- Ocean Blue #03719C ΔE 0.062
- Royal Blue #4169E1 ΔE 0.064
Use #166ABE 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.