#166CCE
Closest named color: Mid Blue (#276AB3). oklch(53.9% 0.17 255.8), rgb(22, 108, 206).
Aa
White text reads best on this color (5.15:1).
About this color
#166CCE is a medium-dark, vivid blue. In OKLCH its lightness is 54%, its chroma 0.170 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.042 away. White text reads best on it, at 5.15:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | vivid (0.170) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 4.07:1 |
| White text | 5.15:1 |
Values
| HEX | #166CCE |
| RGB | rgb(22, 108, 206) |
| HSL | hsl(212, 81%, 45%) |
| OKLCH | oklch(53.9% 0.17 255.8) |
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 #166CCE | 5.15:1 | AA | Lc -80.3 | Fine for body text |
| Black text on #166CCE | 4.07:1 | AA large text | Lc 29.2 | Dividers and decoration only |
| #166CCE text on white | 5.15:1 | AA | Lc 74.9 | Content text, not long reading |
| #166CCE text on black | 4.07:1 | AA large text | Lc -26.8 | 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 600.
-
Step 50
50
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E0EBF9
oklch(93.6% 0.022 254.4)
-
Step 200
200
#C7DBF6
oklch(88.5% 0.043 255.9)
-
Step 300
300
#A0C3F2
oklch(80.8% 0.077 255.9)
-
Step 400
400
#6CA3EC
oklch(70.8% 0.122 255.9)
-
Step 500
500
#428AE6
oklch(63.2% 0.156 255.8)
-
Step 600
600 (this color)
#166CCE
oklch(53.9% 0.17 255.8)
-
Step 700
700
#0E5EB7
oklch(49% 0.158 255.8)
-
Step 800
800
#114D94
oklch(42.6% 0.131 255.9)
-
Step 900
900
#174176
oklch(37.7% 0.102 256)
-
Step 950
950
#0F2745
oklch(27.1% 0.064 255.3)
#166CCE 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) | #3376D2 | 0.035 |
| Deuteranopia (no green cones) | #0066CC | 0.019 |
| Tritanopia (no blue cones) | #008493 | 0.128 |
| Achromatopsia (no color) | #6D6D6D | 0.170 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #166CCE
#166CCE
oklch(53.9% 0.17 255.8)
- #946300
#946300
oklch(53.9% 0.114 75.2)
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 #166CCE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.042
- Royal Blue #4169E1 ΔE 0.043
- Cerulean Blue #056EEE ΔE 0.049
- Windows Blue #3778BF ΔE 0.049
- French Blue #436BAD ΔE 0.058
- Azul #1D5DEC ΔE 0.060
- Neon Blue #4361EE ΔE 0.064
- Warm Blue #4B57DB ΔE 0.065
Use #166CCE 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.