#166EBD
Closest named color: Mid Blue (#276AB3). oklch(53.2% 0.146 251.4), rgb(22, 110, 189).
Aa
White text reads best on this color (5.25:1).
About this color
#166EBD is a medium-dark, vivid blue. In OKLCH its lightness is 53%, its chroma 0.146 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.018 away. White text reads best on it, at 5.25:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | vivid (0.146) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.99:1 |
| White text | 5.25:1 |
Values
| HEX | #166EBD |
| RGB | rgb(22, 110, 189) |
| HSL | hsl(208, 79%, 41%) |
| OKLCH | oklch(53.2% 0.146 251.4) |
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 #166EBD | 5.25:1 | AA | Lc -80.9 | Fine for body text |
| Black text on #166EBD | 3.99:1 | AA large text | Lc 28.5 | Dividers and decoration only |
| #166EBD text on white | 5.25:1 | AA | Lc 75.5 | Fine for body text |
| #166EBD text on black | 3.99:1 | AA large text | Lc -26.2 | 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
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E1EBF7
oklch(93.6% 0.019 252.9)
-
Step 200
200
#C8DBF1
oklch(88.4% 0.037 252.1)
-
Step 300
300
#A2C4EA
oklch(80.9% 0.065 251.5)
-
Step 400
400
#6EA5E0
oklch(70.8% 0.105 251.1)
-
Step 500
500
#448DD8
oklch(63.1% 0.135 251.3)
-
Step 600
600 (this color)
#166EBD
oklch(53.2% 0.146 251.4)
-
Step 700
700
#1162AA
oklch(49.1% 0.136 251.4)
-
Step 800
800
#13508A
oklch(42.6% 0.113 251.7)
-
Step 900
900
#18436E
oklch(37.6% 0.088 251.3)
-
Step 950
950
#102841
oklch(27.2% 0.056 251.4)
#166EBD 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) | #4674C0 | 0.041 |
| Deuteranopia (no green cones) | #2865BB | 0.024 |
| Tritanopia (no blue cones) | #00818C | 0.107 |
| Achromatopsia (no color) | #6C6C6C | 0.146 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #166EBD
#166EBD
oklch(53.2% 0.146 251.4)
- #955F00
#955F00
oklch(53.2% 0.114 71.1)
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 #166EBD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.018
- Windows Blue #3778BF ΔE 0.037
- French Blue #436BAD ΔE 0.038
- Nice Blue #107AB0 ΔE 0.043
- Flat Blue #3C73A8 ΔE 0.046
- Muted Blue #3B719F ΔE 0.054
- Ocean Blue #03719C ΔE 0.056
- Peacock Blue #016795 ΔE 0.066
Use #166EBD 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.