#2166A4
Closest named color: Mid Blue (#276AB3). oklch(50% 0.12 249.7), rgb(33, 102, 164).
Aa
White text reads best on this color (5.99:1).
About this color
#2166A4 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 50%, its chroma 0.120 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.026 away. White text reads best on it, at 5.99:1.
| Hue family | Blues |
| Lightness | medium-dark (50%) |
| Chroma | moderately saturated (0.120) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.50:1 |
| White text | 5.99:1 |
Values
| HEX | #2166A4 |
| RGB | rgb(33, 102, 164) |
| HSL | hsl(208, 66%, 39%) |
| OKLCH | oklch(50% 0.12 249.7) |
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 #2166A4 | 5.99:1 | AA | Lc -84.8 | Fine for body text |
| Black text on #2166A4 | 3.50:1 | AA large text | Lc 24.5 | Dividers and decoration only |
| #2166A4 text on white | 5.99:1 | AA | Lc 79.6 | Fine for body text |
| #2166A4 text on black | 3.50:1 | AA large text | Lc -22.2 | 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 700.
-
Step 50
50
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E2EBF5
oklch(93.6% 0.017 250.8)
-
Step 200
200
#CADBEE
oklch(88.5% 0.032 251.1)
-
Step 300
300
#A5C4E5
oklch(80.9% 0.058 250.2)
-
Step 400
400
#73A5D8
oklch(70.7% 0.092 249.7)
-
Step 500
500
#4C8ECE
oklch(63.1% 0.118 249.6)
-
Step 600
600
#2C77BB
oklch(55.7% 0.128 249.5)
-
Step 700
700 (this color)
#2166A4
oklch(50% 0.12 249.7)
-
Step 800
800
#1C5183
oklch(42.6% 0.1 250.4)
-
Step 900
900
#1D4469
oklch(37.8% 0.077 249.6)
-
Step 950
950
#12283D
oklch(27% 0.048 249)
#2166A4 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) | #496AA7 | 0.040 |
| Deuteranopia (no green cones) | #355EA3 | 0.025 |
| Tritanopia (no blue cones) | #00757D | 0.088 |
| Achromatopsia (no color) | #636363 | 0.120 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2166A4
#2166A4
oklch(50% 0.12 249.7)
- #8A5600
#8A5600
oklch(50% 0.109 69.6)
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 #2166A4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.026
- Peacock Blue #016795 ΔE 0.029
- French Blue #436BAD ΔE 0.037
- Ocean Blue #03719C ΔE 0.038
- Denim Blue #3B5B92 ΔE 0.040
- Denim #3B638C ΔE 0.041
- Dusky Blue #475F94 ΔE 0.041
- Muted Blue #3B719F ΔE 0.043
Use #2166A4 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.