#2172CD
Closest named color: Windows Blue (#3778BF). oklch(55.4% 0.16 254.8), rgb(33, 114, 205).
Aa
White text reads best on this color (4.82:1).
About this color
#2172CD is a medium-dark, vivid blue. In OKLCH its lightness is 55%, its chroma 0.160 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.033 away. White text reads best on it, at 4.82:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.160) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.35:1 |
| White text | 4.82:1 |
Values
| HEX | #2172CD |
| RGB | rgb(33, 114, 205) |
| HSL | hsl(212, 72%, 47%) |
| OKLCH | oklch(55.4% 0.16 254.8) |
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 #2172CD | 4.82:1 | AA | Lc -78.4 | Fine for body text |
| Black text on #2172CD | 4.35:1 | AA large text | Lc 31.1 | Non-text elements, placeholder text |
| #2172CD text on white | 4.82:1 | AA | Lc 72.9 | Content text, not long reading |
| #2172CD text on black | 4.35:1 | AA large text | Lc -28.7 | 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
#E1EBF8
oklch(93.6% 0.021 254.9)
-
Step 200
200
#C8DBF4
oklch(88.5% 0.04 255.3)
-
Step 300
300
#A1C3EF
oklch(80.8% 0.073 255)
-
Step 400
400
#6EA3E7
oklch(70.6% 0.115 255.1)
-
Step 500
500
#458BE0
oklch(63.2% 0.147 254.7)
-
Step 600
600 (this color)
#2172CD
oklch(55.4% 0.16 254.8)
-
Step 700
700
#1360B2
oklch(49.2% 0.148 254.6)
-
Step 800
800
#144E90
oklch(42.6% 0.123 255)
-
Step 900
900
#194273
oklch(37.8% 0.096 254.8)
-
Step 950
950
#102743
oklch(27% 0.06 254.6)
#2172CD 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) | #427AD0 | 0.035 |
| Deuteranopia (no green cones) | #1B6BCB | 0.020 |
| Tritanopia (no blue cones) | #008895 | 0.121 |
| Achromatopsia (no color) | #727272 | 0.160 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2172CD
#2172CD
oklch(55.4% 0.16 254.8)
- #9A6700
#9A6700
oklch(55.4% 0.117 75)
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 #2172CD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.033
- Mid Blue #276AB3 ΔE 0.043
- Royal Blue #4169E1 ΔE 0.046
- Cerulean Blue #056EEE ΔE 0.053
- French Blue #436BAD ΔE 0.053
- Nice Blue #107AB0 ΔE 0.055
- Water Blue #0E87CC ΔE 0.058
- Flat Blue #3C73A8 ΔE 0.060
Use #2172CD 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.