#2172D2
Closest named color: Windows Blue (#3778BF). oklch(55.7% 0.166 255.7), rgb(33, 114, 210).
Aa
White text reads best on this color (4.77:1).
About this color
#2172D2 is a medium-dark, vivid blue. In OKLCH its lightness is 56%, its chroma 0.166 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.039 away. White text reads best on it, at 4.77:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.166) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.40:1 |
| White text | 4.77:1 |
Values
| HEX | #2172D2 |
| RGB | rgb(33, 114, 210) |
| HSL | hsl(213, 73%, 48%) |
| OKLCH | oklch(55.7% 0.166 255.7) |
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 #2172D2 | 4.77:1 | AA | Lc -78.0 | Fine for body text |
| Black text on #2172D2 | 4.40:1 | AA large text | Lc 31.5 | Non-text elements, placeholder text |
| #2172D2 text on white | 4.77:1 | AA | Lc 72.6 | Content text, not long reading |
| #2172D2 text on black | 4.40:1 | AA large text | Lc -29.1 | 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
#C8DBF5
oklch(88.5% 0.041 256.2)
-
Step 300
300
#A1C3F1
oklch(80.8% 0.075 256.1)
-
Step 400
400
#6DA3EA
oklch(70.7% 0.119 255.7)
-
Step 500
500
#438AE4
oklch(63.1% 0.154 255.6)
-
Step 600
600 (this color)
#2172D2
oklch(55.7% 0.166 255.7)
-
Step 700
700
#125FB6
oklch(49.2% 0.155 255.7)
-
Step 800
800
#134E93
oklch(42.8% 0.128 255.6)
-
Step 900
900
#184175
oklch(37.6% 0.1 256)
-
Step 950
950
#0F2745
oklch(27.1% 0.064 255.3)
#2172D2 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) | #3D7BD6 | 0.034 |
| Deuteranopia (no green cones) | #0B6BD0 | 0.022 |
| Tritanopia (no blue cones) | #008998 | 0.125 |
| Achromatopsia (no color) | #737373 | 0.166 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2172D2
#2172D2
oklch(55.7% 0.166 255.7)
- #9B6800
#9B6800
oklch(55.7% 0.117 75.3)
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 #2172D2, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.039
- Royal Blue #4169E1 ΔE 0.040
- Cerulean Blue #056EEE ΔE 0.046
- Mid Blue #276AB3 ΔE 0.050
- Water Blue #0E87CC ΔE 0.060
- French Blue #436BAD ΔE 0.060
- Nice Blue #107AB0 ΔE 0.062
- Neon Blue #4361EE ΔE 0.065
Use #2172D2 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.