#2171B7
Closest named color: Mid Blue (#276AB3). oklch(53.7% 0.133 249.6), rgb(33, 113, 183).
Aa
White text reads best on this color (5.10:1).
About this color
#2171B7 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 54%, its chroma 0.133 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.019 away. White text reads best on it, at 5.10:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.133) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 4.11:1 |
| White text | 5.10:1 |
Values
| HEX | #2171B7 |
| RGB | rgb(33, 113, 183) |
| HSL | hsl(208, 69%, 42%) |
| OKLCH | oklch(53.7% 0.133 249.6) |
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 #2171B7 | 5.10:1 | AA | Lc -80.2 | Fine for body text |
| Black text on #2171B7 | 4.11:1 | AA large text | Lc 29.3 | Dividers and decoration only |
| #2171B7 text on white | 5.10:1 | AA | Lc 74.8 | Content text, not long reading |
| #2171B7 text on black | 4.11:1 | AA large text | Lc -26.9 | 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
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E1EBF5
oklch(93.5% 0.017 248)
-
Step 200
200
#C9DBEF
oklch(88.4% 0.034 251)
-
Step 300
300
#A4C4E6
oklch(80.8% 0.059 250.1)
-
Step 400
400
#71A5DA
oklch(70.6% 0.096 249.8)
-
Step 500
500
#498ED0
oklch(63.1% 0.122 249.4)
-
Step 600
600 (this color)
#2171B7
oklch(53.7% 0.133 249.6)
-
Step 700
700
#1A63A3
oklch(49% 0.124 249.9)
-
Step 800
800
#195184
oklch(42.6% 0.102 250)
-
Step 900
900
#1B446A
oklch(37.7% 0.08 249.3)
-
Step 950
950
#11283E
oklch(27% 0.05 249.3)
#2171B7 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) | #4F75BA | 0.042 |
| Deuteranopia (no green cones) | #3868B6 | 0.027 |
| Tritanopia (no blue cones) | #00828B | 0.097 |
| Achromatopsia (no color) | #6E6E6E | 0.133 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2171B7
#2171B7
oklch(53.7% 0.133 249.6)
- #985F00
#985F00
oklch(53.6% 0.117 69.4)
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 #2171B7, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.019
- Windows Blue #3778BF ΔE 0.029
- French Blue #436BAD ΔE 0.030
- Nice Blue #107AB0 ΔE 0.030
- Flat Blue #3C73A8 ΔE 0.031
- Muted Blue #3B719F ΔE 0.041
- Ocean Blue #03719C ΔE 0.046
- Dull Blue #49759C ΔE 0.056
Use #2171B7 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.