#2173A2
Closest named color: Ocean Blue (#03719C). oklch(53% 0.106 239.2), rgb(33, 115, 162).
Aa
White text reads best on this color (5.19:1).
About this color
#2173A2 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 53%, its chroma 0.106 and its hue 239°. Its hue sits on the cool side of the wheel. The nearest named color is Ocean Blue (#03719C), ΔE 0.016 away. White text reads best on it, at 5.19:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | moderately saturated (0.106) |
| Temperature | cool |
| Nearest name | Ocean Blue (#03719C) |
| Black text | 4.03:1 |
| White text | 5.19:1 |
Values
| HEX | #2173A2 |
| RGB | rgb(33, 115, 162) |
| HSL | hsl(202, 66%, 38%) |
| OKLCH | oklch(53% 0.106 239.2) |
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 #2173A2 | 5.19:1 | AA | Lc -80.8 | Fine for body text |
| Black text on #2173A2 | 4.03:1 | AA large text | Lc 28.7 | Dividers and decoration only |
| #2173A2 text on white | 5.19:1 | AA | Lc 75.4 | Fine for body text |
| #2173A2 text on black | 4.03:1 | AA large text | Lc -26.3 | 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
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E2EBF2
oklch(93.5% 0.014 241)
-
Step 200
200
#CADCE9
oklch(88.5% 0.026 239.1)
-
Step 300
300
#A5C6DD
oklch(81% 0.048 238.6)
-
Step 400
400
#73A8CB
oklch(70.8% 0.076 238.2)
-
Step 500
500
#4C91BE
oklch(63% 0.097 239.4)
-
Step 600
600 (this color)
#2173A2
oklch(53% 0.106 239.2)
-
Step 700
700
#1C6792
oklch(49% 0.098 239.3)
-
Step 800
800
#1B5477
oklch(42.6% 0.082 240)
-
Step 900
900
#1D4660
oklch(37.8% 0.064 239.4)
-
Step 950
950
#122938
oklch(27% 0.04 239.2)
#2173A2 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) | #5D73A4 | 0.056 |
| Deuteranopia (no green cones) | #4B67A1 | 0.045 |
| Tritanopia (no blue cones) | #007F83 | 0.071 |
| Achromatopsia (no color) | #6D6D6D | 0.106 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2173A2
#2173A2
oklch(53% 0.106 239.2)
- #985B23
#985B23
oklch(53% 0.106 59.4)
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 #2173A2, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Ocean Blue #03719C ΔE 0.016
- Muted Blue #3B719F ΔE 0.018
- Flat Blue #3C73A8 ΔE 0.023
- Sea Blue #047495 ΔE 0.025
- Nice Blue #107AB0 ΔE 0.026
- Dull Blue #49759C ΔE 0.034
- French Blue #436BAD ΔE 0.040
- Cerulean #457B9D ΔE 0.041
Use #2173A2 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.