#2173AC
Closest named color: Flat Blue (#3C73A8). oklch(53.5% 0.117 244.2), rgb(33, 115, 172).
Aa
White text reads best on this color (5.10:1).
About this color
#2173AC is a medium-dark, moderately saturated blue. In OKLCH its lightness is 54%, its chroma 0.117 and its hue 244°. Its hue sits on the cool side of the wheel. The nearest named color is Flat Blue (#3C73A8), ΔE 0.020 away. White text reads best on it, at 5.10:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.117) |
| Temperature | cool |
| Nearest name | Flat Blue (#3C73A8) |
| Black text | 4.11:1 |
| White text | 5.10:1 |
Values
| HEX | #2173AC |
| RGB | rgb(33, 115, 172) |
| HSL | hsl(205, 68%, 40%) |
| OKLCH | oklch(53.5% 0.117 244.2) |
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 #2173AC | 5.10:1 | AA | Lc -80.2 | Fine for body text |
| Black text on #2173AC | 4.11:1 | AA large text | Lc 29.2 | Dividers and decoration only |
| #2173AC text on white | 5.10:1 | AA | Lc 74.8 | Content text, not long reading |
| #2173AC 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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E2EBF4
oklch(93.6% 0.016 248)
-
Step 200
200
#CADCEC
oklch(88.6% 0.029 244.9)
-
Step 300
300
#A4C5E1
oklch(80.9% 0.053 244.1)
-
Step 400
400
#72A7D2
oklch(70.8% 0.085 243.9)
-
Step 500
500
#4A90C6
oklch(63.1% 0.108 244)
-
Step 600
600 (this color)
#2173AC
oklch(53.5% 0.117 244.2)
-
Step 700
700
#1A669A
oklch(49.2% 0.109 244.2)
-
Step 800
800
#19537D
oklch(42.7% 0.091 244.6)
-
Step 900
900
#1C4564
oklch(37.7% 0.07 244.2)
-
Step 950
950
#12293B
oklch(27.2% 0.044 244.1)
#2173AC 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) | #5875AE | 0.051 |
| Deuteranopia (no green cones) | #4568AB | 0.038 |
| Tritanopia (no blue cones) | #008187 | 0.082 |
| Achromatopsia (no color) | #6E6E6E | 0.117 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2173AC
#2173AC
oklch(53.5% 0.117 244.2)
- #9B5C0B
#9B5C0B
oklch(53.5% 0.117 64.1)
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 #2173AC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Flat Blue #3C73A8 ΔE 0.020
- Nice Blue #107AB0 ΔE 0.020
- Muted Blue #3B719F ΔE 0.025
- Ocean Blue #03719C ΔE 0.029
- Mid Blue #276AB3 ΔE 0.030
- French Blue #436BAD ΔE 0.032
- Windows Blue #3778BF ΔE 0.037
- Sea Blue #047495 ΔE 0.040
Use #2173AC 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.