#2172B3
Closest named color: Mid Blue (#276AB3). oklch(53.7% 0.127 247.7), rgb(33, 114, 179).
Aa
White text reads best on this color (5.09:1).
About this color
#2172B3 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 54%, its chroma 0.127 and its hue 248°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.022 away. White text reads best on it, at 5.09:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.127) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 4.12:1 |
| White text | 5.09:1 |
Values
| HEX | #2172B3 |
| RGB | rgb(33, 114, 179) |
| HSL | hsl(207, 69%, 42%) |
| OKLCH | oklch(53.7% 0.127 247.7) |
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 #2172B3 | 5.09:1 | AA | Lc -80.1 | Fine for body text |
| Black text on #2172B3 | 4.12:1 | AA large text | Lc 29.3 | Dividers and decoration only |
| #2172B3 text on white | 5.09:1 | AA | Lc 74.7 | Content text, not long reading |
| #2172B3 text on black | 4.12:1 | AA large text | Lc -27.0 | 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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E2EBF5
oklch(93.6% 0.017 250.8)
-
Step 200
200
#C9DCEE
oklch(88.6% 0.032 246.7)
-
Step 300
300
#A4C5E4
oklch(81% 0.057 246.9)
-
Step 400
400
#71A6D7
oklch(70.7% 0.091 247.3)
-
Step 500
500
#4A8FCC
oklch(63.2% 0.116 247.5)
-
Step 600
600 (this color)
#2172B3
oklch(53.7% 0.127 247.7)
-
Step 700
700
#1A64A0
oklch(49.1% 0.119 248.2)
-
Step 800
800
#195281
oklch(42.7% 0.097 247.7)
-
Step 900
900
#1C4468
oklch(37.7% 0.077 248.4)
-
Step 950
950
#11283D
oklch(26.9% 0.049 248.1)
#2172B3 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) | #5375B6 | 0.046 |
| Deuteranopia (no green cones) | #3E68B2 | 0.032 |
| Tritanopia (no blue cones) | #00828A | 0.091 |
| Achromatopsia (no color) | #6E6E6E | 0.127 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2172B3
#2172B3
oklch(53.7% 0.127 247.7)
- #9A5E00
#9A5E00
oklch(53.7% 0.118 67.5)
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 #2172B3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.022
- Nice Blue #107AB0 ΔE 0.025
- Flat Blue #3C73A8 ΔE 0.026
- French Blue #436BAD ΔE 0.030
- Windows Blue #3778BF ΔE 0.030
- Muted Blue #3B719F ΔE 0.034
- Ocean Blue #03719C ΔE 0.039
- Dull Blue #49759C ΔE 0.049
Use #2172B3 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.