#037DC0
Closest named color: Windows Blue (#3778BF). oklch(56.7% 0.137 243.3), rgb(3, 125, 192).
Aa
Black text reads best on this color (4.69:1).
About this color
#037DC0 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 57%, its chroma 0.137 and its hue 243°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.024 away. Black text reads best on it, at 4.69:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.137) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.69:1 |
| White text | 4.46:1 |
Values
| HEX | #037DC0 |
| RGB | rgb(3, 125, 192) |
| HSL | hsl(201, 97%, 38%) |
| OKLCH | oklch(56.7% 0.137 243.3) |
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 #037DC0 | 4.46:1 | AA large text | Lc -75.9 | Fine for body text |
| Black text on #037DC0 | 4.69:1 | AA | Lc 33.7 | Non-text elements, placeholder text |
| #037DC0 text on white | 4.46:1 | AA large text | Lc 70.4 | Content text, not long reading |
| #037DC0 text on black | 4.69:1 | AA | Lc -31.3 | Non-text elements, placeholder text |
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
#E0ECF5
oklch(93.7% 0.018 240)
-
Step 200
200
#C7DCEF
oklch(88.5% 0.035 245.5)
-
Step 300
300
#9FC6E6
oklch(80.9% 0.062 243.3)
-
Step 400
400
#68A8D9
oklch(70.8% 0.098 242.8)
-
Step 500
500
#3891CF
oklch(63.2% 0.125 243)
-
Step 600
600 (this color)
#037DC0
oklch(56.7% 0.137 243.3)
-
Step 700
700
#00669E
oklch(49% 0.119 243.2)
-
Step 800
800
#005483
oklch(42.8% 0.104 243)
-
Step 900
900
#0F456A
oklch(37.6% 0.083 244.1)
-
Step 950
950
#0C293E
oklch(27.1% 0.052 243.5)
#037DC0 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) | #5C7FC3 | 0.059 |
| Deuteranopia (no green cones) | #4370BF | 0.044 |
| Tritanopia (no blue cones) | #008E95 | 0.095 |
| Achromatopsia (no color) | #777777 | 0.137 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #037DC0
#037DC0
oklch(56.7% 0.137 243.3)
- #AA6300
#AA6300
oklch(56.7% 0.129 63.7)
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 #037DC0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.024
- Nice Blue #107AB0 ΔE 0.025
- Water Blue #0E87CC ΔE 0.032
- Steel Blue #4682B4 ΔE 0.043
- Flat Blue #3C73A8 ΔE 0.045
- Cool Blue #4984B8 ΔE 0.047
- Blue NCS #118AB2 ΔE 0.049
- Mid Blue #276AB3 ΔE 0.053
Use #037DC0 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.