#2172C8
Closest named color: Windows Blue (#3778BF). oklch(55% 0.153 253.7), rgb(33, 114, 200).
Aa
White text reads best on this color (4.87:1).
About this color
#2172C8 is a medium-dark, vivid blue. In OKLCH its lightness is 55%, its chroma 0.153 and its hue 254°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.029 away. White text reads best on it, at 4.87:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.153) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.30:1 |
| White text | 4.87:1 |
Values
| HEX | #2172C8 |
| RGB | rgb(33, 114, 200) |
| HSL | hsl(211, 72%, 46%) |
| OKLCH | oklch(55% 0.153 253.7) |
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 #2172C8 | 4.87:1 | AA | Lc -78.7 | Fine for body text |
| Black text on #2172C8 | 4.30:1 | AA large text | Lc 30.8 | Non-text elements, placeholder text |
| #2172C8 text on white | 4.87:1 | AA | Lc 73.3 | Content text, not long reading |
| #2172C8 text on black | 4.30:1 | AA large text | Lc -28.4 | 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
#E1EBF7
oklch(93.6% 0.019 252.9)
-
Step 200
200
#C8DBF3
oklch(88.5% 0.039 254.3)
-
Step 300
300
#A2C4ED
oklch(81% 0.069 253.4)
-
Step 400
400
#6EA4E4
oklch(70.7% 0.11 253.4)
-
Step 500
500
#468BDC
oklch(63% 0.141 254)
-
Step 600
600 (this color)
#2172C8
oklch(55% 0.153 253.7)
-
Step 700
700
#1461AF
oklch(49.2% 0.143 253.6)
-
Step 800
800
#154F8D
oklch(42.6% 0.118 253.7)
-
Step 900
900
#194271
oklch(37.6% 0.093 254)
-
Step 950
950
#102742
oklch(27% 0.058 253.9)
#2172C8 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) | #4679CB | 0.037 |
| Deuteranopia (no green cones) | #256AC6 | 0.021 |
| Tritanopia (no blue cones) | #008793 | 0.116 |
| Achromatopsia (no color) | #717171 | 0.153 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2172C8
#2172C8
oklch(55% 0.153 253.7)
- #9A6500
#9A6500
oklch(55% 0.117 73.3)
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 #2172C8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.029
- Mid Blue #276AB3 ΔE 0.036
- French Blue #436BAD ΔE 0.047
- Nice Blue #107AB0 ΔE 0.048
- Royal Blue #4169E1 ΔE 0.052
- Flat Blue #3C73A8 ΔE 0.053
- Water Blue #0E87CC ΔE 0.057
- Cerulean Blue #056EEE ΔE 0.061
Use #2172C8 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.