#2166C9
Closest named color: Mid Blue (#276AB3). oklch(52.5% 0.169 258.4), rgb(33, 102, 201).
Aa
White text reads best on this color (5.51:1).
About this color
#2166C9 is a medium-dark, vivid blue. In OKLCH its lightness is 52%, its chroma 0.169 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.038 away. White text reads best on it, at 5.51:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.169) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.80:1 |
| White text | 5.51:1 |
Values
| HEX | #2166C9 |
| RGB | rgb(33, 102, 201) |
| HSL | hsl(215, 72%, 46%) |
| OKLCH | oklch(52.5% 0.169 258.4) |
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 #2166C9 | 5.51:1 | AA | Lc -82.3 | Fine for body text |
| Black text on #2166C9 | 3.80:1 | AA large text | Lc 27.1 | Dividers and decoration only |
| #2166C9 text on white | 5.51:1 | AA | Lc 77.0 | Fine for body text |
| #2166C9 text on black | 3.80:1 | AA large text | Lc -24.8 | 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
#E1EBF9
oklch(93.7% 0.022 256.7)
-
Step 200
200
#C9DBF6
oklch(88.6% 0.042 258.4)
-
Step 300
300
#A3C2F2
oklch(80.8% 0.076 259)
-
Step 400
400
#71A2EC
oklch(70.8% 0.121 258.4)
-
Step 500
500
#4A88E6
oklch(63.1% 0.156 258.6)
-
Step 600
600 (this color)
#2166C9
oklch(52.5% 0.169 258.4)
-
Step 700
700
#1E5DB7
oklch(49.1% 0.156 258.3)
-
Step 800
800
#1B4C94
oklch(42.6% 0.13 258.5)
-
Step 900
900
#1C4076
oklch(37.6% 0.101 258.5)
-
Step 950
950
#112645
oklch(27% 0.064 258.1)
#2166C9 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) | #2971CD | 0.031 |
| Deuteranopia (no green cones) | #0062C7 | 0.018 |
| Tritanopia (no blue cones) | #007E8E | 0.128 |
| Achromatopsia (no color) | #696969 | 0.169 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2166C9
#2166C9
oklch(52.5% 0.169 258.4)
- #8C6100
#8C6100
oklch(52.5% 0.109 78.4)
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 #2166C9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.038
- Royal Blue #4169E1 ΔE 0.047
- French Blue #436BAD ΔE 0.055
- Warm Blue #4B57DB ΔE 0.057
- Cerulean Blue #056EEE ΔE 0.058
- Windows Blue #3778BF ΔE 0.058
- Azul #1D5DEC ΔE 0.059
- Neon Blue #4361EE ΔE 0.065
Use #2166C9 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.