#127DC4
Closest named color: Windows Blue (#3778BF). oklch(57.1% 0.14 245.6), rgb(18, 125, 196).
Aa
Black text reads best on this color (4.75:1).
About this color
#127DC4 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 57%, its chroma 0.140 and its hue 246°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.021 away. Black text reads best on it, at 4.75:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.140) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.75:1 |
| White text | 4.41:1 |
Values
| HEX | #127DC4 |
| RGB | rgb(18, 125, 196) |
| HSL | hsl(204, 83%, 42%) |
| OKLCH | oklch(57.1% 0.14 245.6) |
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 #127DC4 | 4.41:1 | AA large text | Lc -75.5 | Fine for body text |
| Black text on #127DC4 | 4.75:1 | AA | Lc 34.0 | Non-text elements, placeholder text |
| #127DC4 text on white | 4.41:1 | AA large text | Lc 70.1 | Content text, not long reading |
| #127DC4 text on black | 4.75:1 | AA | Lc -31.6 | 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
#E0EBF6
oklch(93.5% 0.019 248)
-
Step 200
200
#C7DCEF
oklch(88.5% 0.035 245.5)
-
Step 300
300
#9FC5E7
oklch(80.8% 0.063 245.7)
-
Step 400
400
#69A7DC
oklch(70.8% 0.101 245.7)
-
Step 500
500
#3B90D2
oklch(63.2% 0.128 245.5)
-
Step 600
600 (this color)
#127DC4
oklch(57.1% 0.14 245.6)
-
Step 700
700
#0065A2
oklch(49% 0.125 245.5)
-
Step 800
800
#025386
oklch(42.8% 0.108 245.5)
-
Step 900
900
#11456B
oklch(37.7% 0.084 245.3)
-
Step 950
950
#0D293F
oklch(27.2% 0.053 245.4)
#127DC4 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) | #5B80C7 | 0.055 |
| Deuteranopia (no green cones) | #4171C3 | 0.039 |
| Tritanopia (no blue cones) | #008E97 | 0.097 |
| Achromatopsia (no color) | #787878 | 0.140 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #127DC4
#127DC4
oklch(57.1% 0.14 245.6)
- #A96500
#A96500
oklch(57% 0.127 65.6)
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 #127DC4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.021
- Water Blue #0E87CC ΔE 0.029
- Nice Blue #107AB0 ΔE 0.031
- Steel Blue #4682B4 ΔE 0.044
- Cool Blue #4984B8 ΔE 0.046
- Flat Blue #3C73A8 ΔE 0.048
- Blue NCS #118AB2 ΔE 0.052
- Mid Blue #276AB3 ΔE 0.054
Use #127DC4 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.