#2573C8
Closest named color: Windows Blue (#3778BF). oklch(55.4% 0.151 253.9), rgb(37, 115, 200).
Aa
White text reads best on this color (4.81:1).
About this color
#2573C8 is a medium-dark, vivid blue. In OKLCH its lightness is 55%, its chroma 0.151 and its hue 254°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.025 away. White text reads best on it, at 4.81:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.151) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.36:1 |
| White text | 4.81:1 |
Values
| HEX | #2573C8 |
| RGB | rgb(37, 115, 200) |
| HSL | hsl(211, 69%, 46%) |
| OKLCH | oklch(55.4% 0.151 253.9) |
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 #2573C8 | 4.81:1 | AA | Lc -78.4 | Fine for body text |
| Black text on #2573C8 | 4.36:1 | AA large text | Lc 31.2 | Non-text elements, placeholder text |
| #2573C8 text on white | 4.81:1 | AA | Lc 72.9 | Content text, not long reading |
| #2573C8 text on black | 4.36:1 | AA large text | Lc -28.8 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E1EBF7
oklch(93.6% 0.019 252.9)
-
Step 200
200
#C8DBF2
oklch(88.4% 0.038 253.2)
-
Step 300
300
#A3C4EC
oklch(81% 0.067 253.5)
-
Step 400
400
#6FA4E3
oklch(70.7% 0.109 253.5)
-
Step 500
500
#478BDB
oklch(63% 0.14 254)
-
Step 600
600 (this color)
#2573C8
oklch(55.4% 0.151 253.9)
-
Step 700
700
#1861AE
oklch(49.2% 0.141 253.9)
-
Step 800
800
#174F8D
oklch(42.7% 0.117 254.2)
-
Step 900
900
#1A4270
oklch(37.6% 0.091 254)
-
Step 950
950
#112742
oklch(27% 0.058 254.7)
#2573C8 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) | #487ACB | 0.036 |
| Deuteranopia (no green cones) | #2A6BC6 | 0.021 |
| Tritanopia (no blue cones) | #008794 | 0.112 |
| Achromatopsia (no color) | #727272 | 0.151 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2573C8
#2573C8
oklch(55.4% 0.151 253.9)
- #9B6600
#9B6600
oklch(55.3% 0.118 73.6)
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 #2573C8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.025
- Mid Blue #276AB3 ΔE 0.038
- French Blue #436BAD ΔE 0.046
- Nice Blue #107AB0 ΔE 0.047
- Flat Blue #3C73A8 ΔE 0.052
- Royal Blue #4169E1 ΔE 0.052
- Water Blue #0E87CC ΔE 0.054
- Cerulean Blue #056EEE ΔE 0.062
Use #2573C8 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.