#4166BF
Closest named color: Mid Blue (#276AB3). oklch(53% 0.146 264.9), rgb(65, 102, 191).
Aa
White text reads best on this color (5.41:1).
About this color
#4166BF is a medium-dark, vivid blue. In OKLCH its lightness is 53%, its chroma 0.146 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.032 away. White text reads best on it, at 5.41:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | vivid (0.146) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.87:1 |
| White text | 5.41:1 |
Values
| HEX | #4166BF |
| RGB | rgb(65, 102, 191) |
| HSL | hsl(222, 50%, 50%) |
| OKLCH | oklch(53% 0.146 264.9) |
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 #4166BF | 5.41:1 | AA | Lc -82.0 | Fine for body text |
| Black text on #4166BF | 3.87:1 | AA large text | Lc 27.4 | Dividers and decoration only |
| #4166BF text on white | 5.41:1 | AA | Lc 76.7 | Fine for body text |
| #4166BF text on black | 3.87:1 | 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 600.
-
Step 50
50
#F2F5FC
oklch(97% 0.01 267.4)
-
Step 100
100
#E4EAF7
oklch(93.6% 0.019 266)
-
Step 200
200
#CDD9F2
oklch(88.4% 0.037 265.1)
-
Step 300
300
#ACC1EC
oklch(81% 0.065 264.5)
-
Step 400
400
#809FE2
oklch(70.6% 0.105 264.8)
-
Step 500
500
#6186DA
oklch(63.1% 0.134 264.9)
-
Step 600
600 (this color)
#4166BF
oklch(53% 0.146 264.9)
-
Step 700
700
#3A5CAD
oklch(49.2% 0.135 264.8)
-
Step 800
800
#304B8C
oklch(42.7% 0.113 265)
-
Step 900
900
#2A3F70
oklch(37.6% 0.088 265)
-
Step 950
950
#192541
oklch(26.9% 0.055 265.3)
#4166BF 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) | #3970C2 | 0.026 |
| Deuteranopia (no green cones) | #2165BD | 0.027 |
| Tritanopia (no blue cones) | #007B89 | 0.122 |
| Achromatopsia (no color) | #6A6A6A | 0.146 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4166BF
#4166BF
oklch(53% 0.146 264.9)
- #886500
#886500
oklch(52.8% 0.108 84.7)
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 #4166BF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.032
- French Blue #436BAD ΔE 0.034
- Windows Blue #3778BF ΔE 0.049
- Royal Blue #4169E1 ΔE 0.052
- Iris #6258C4 ΔE 0.053
- Flat Blue #3C73A8 ΔE 0.056
- Dark Periwinkle #665FD1 ΔE 0.058
- Warm Blue #4B57DB ΔE 0.059
Use #4166BF 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.