#2575C5
Closest named color: Windows Blue (#3778BF). oklch(55.6% 0.145 252.3), rgb(37, 117, 197).
Aa
White text reads best on this color (4.74:1).
About this color
#2575C5 is a medium-dark, vivid blue. In OKLCH its lightness is 56%, its chroma 0.145 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.019 away. White text reads best on it, at 4.74:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.145) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.42:1 |
| White text | 4.74:1 |
Values
| HEX | #2575C5 |
| RGB | rgb(37, 117, 197) |
| HSL | hsl(210, 68%, 46%) |
| OKLCH | oklch(55.6% 0.145 252.3) |
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 #2575C5 | 4.74:1 | AA | Lc -77.9 | Fine for body text |
| Black text on #2575C5 | 4.42:1 | AA large text | Lc 31.6 | Non-text elements, placeholder text |
| #2575C5 text on white | 4.74:1 | AA | Lc 72.5 | Content text, not long reading |
| #2575C5 text on black | 4.42:1 | AA large text | Lc -29.2 | 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
#E1EBF7
oklch(93.6% 0.019 252.9)
-
Step 200
200
#C9DBF1
oklch(88.5% 0.036 253.5)
-
Step 300
300
#A3C4EA
oklch(80.9% 0.065 252.2)
-
Step 400
400
#6FA4E0
oklch(70.6% 0.105 252.3)
-
Step 500
500
#478CD7
oklch(63% 0.133 252.4)
-
Step 600
600 (this color)
#2575C5
oklch(55.6% 0.145 252.3)
-
Step 700
700
#1662AA
oklch(49.1% 0.135 252)
-
Step 800
800
#16508A
oklch(42.7% 0.112 252.3)
-
Step 900
900
#1A436E
oklch(37.7% 0.087 252.1)
-
Step 950
950
#102740
oklch(26.8% 0.055 252.3)
#2575C5 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) | #4E7BC8 | 0.040 |
| Deuteranopia (no green cones) | #336CC3 | 0.024 |
| Tritanopia (no blue cones) | #008893 | 0.108 |
| Achromatopsia (no color) | #737373 | 0.145 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2575C5
#2575C5
oklch(55.6% 0.145 252.3)
- #9D6600
#9D6600
oklch(55.6% 0.119 72.5)
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 #2575C5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.019
- Mid Blue #276AB3 ΔE 0.038
- Nice Blue #107AB0 ΔE 0.040
- French Blue #436BAD ΔE 0.044
- Flat Blue #3C73A8 ΔE 0.046
- Water Blue #0E87CC ΔE 0.049
- Steel Blue #4682B4 ΔE 0.057
- Muted Blue #3B719F ΔE 0.059
Use #2575C5 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.