#2573BA
Closest named color: Windows Blue (#3778BF). oklch(54.5% 0.133 250.2), rgb(37, 115, 186).
Aa
White text reads best on this color (4.95:1).
About this color
#2573BA 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 Windows Blue (#3778BF), ΔE 0.022 away. White text reads best on it, at 4.95:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.133) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.23:1 |
| White text | 4.95:1 |
Values
| HEX | #2573BA |
| RGB | rgb(37, 115, 186) |
| HSL | hsl(209, 67%, 44%) |
| OKLCH | oklch(54.5% 0.133 250.2) |
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 #2573BA | 4.95:1 | AA | Lc -79.3 | Fine for body text |
| Black text on #2573BA | 4.23:1 | AA large text | Lc 30.2 | Non-text elements, placeholder text |
| #2573BA text on white | 4.95:1 | AA | Lc 73.9 | Content text, not long reading |
| #2573BA text on black | 4.23:1 | AA large text | Lc -27.8 | 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E1EBF5
oklch(93.5% 0.017 248)
-
Step 200
200
#C9DBEF
oklch(88.4% 0.034 251)
-
Step 300
300
#A4C4E7
oklch(80.9% 0.061 250.9)
-
Step 400
400
#72A5DA
oklch(70.7% 0.095 250.2)
-
Step 500
500
#4A8ED1
oklch(63.2% 0.123 250.1)
-
Step 600
600 (this color)
#2573BA
oklch(54.5% 0.133 250.2)
-
Step 700
700
#1B63A4
oklch(49.1% 0.125 250.4)
-
Step 800
800
#195185
oklch(42.7% 0.104 250.4)
-
Step 900
900
#1C446A
oklch(37.8% 0.079 249.7)
-
Step 950
950
#11283E
oklch(27% 0.05 249.3)
#2573BA 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) | #5177BD | 0.042 |
| Deuteranopia (no green cones) | #3A6AB9 | 0.027 |
| Tritanopia (no blue cones) | #00848D | 0.099 |
| Achromatopsia (no color) | #707070 | 0.133 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2573BA
#2573BA
oklch(54.5% 0.133 250.2)
- #9B6200
#9B6200
oklch(54.6% 0.118 70.3)
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 #2573BA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.022
- Mid Blue #276AB3 ΔE 0.026
- Nice Blue #107AB0 ΔE 0.029
- Flat Blue #3C73A8 ΔE 0.032
- French Blue #436BAD ΔE 0.032
- Muted Blue #3B719F ΔE 0.043
- Ocean Blue #03719C ΔE 0.051
- Dull Blue #49759C ΔE 0.055
Use #2573BA 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.