#127DCF
Closest named color: Windows Blue (#3778BF). oklch(57.7% 0.153 249), rgb(18, 125, 207).
Aa
Black text reads best on this color (4.86:1).
About this color
#127DCF is a medium-dark, vivid blue. In OKLCH its lightness is 58%, its chroma 0.153 and its hue 249°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.029 away. Black text reads best on it, at 4.86:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | vivid (0.153) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.86:1 |
| White text | 4.32:1 |
Values
| HEX | #127DCF |
| RGB | rgb(18, 125, 207) |
| HSL | hsl(206, 84%, 44%) |
| OKLCH | oklch(57.7% 0.153 249) |
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 #127DCF | 4.32:1 | AA large text | Lc -74.8 | Content text, not long reading |
| Black text on #127DCF | 4.86:1 | AA | Lc 34.8 | Non-text elements, placeholder text |
| #127DCF text on white | 4.32:1 | AA large text | Lc 69.3 | Content text, not long reading |
| #127DCF text on black | 4.86:1 | AA | Lc -32.3 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E0EBF7
oklch(93.5% 0.02 250.4)
-
Step 200
200
#C6DCF2
oklch(88.5% 0.038 248.3)
-
Step 300
300
#9FC5EC
oklch(80.9% 0.069 249.4)
-
Step 400
400
#67A6E2
oklch(70.7% 0.11 248.5)
-
Step 500
500
#398EDA
oklch(63.1% 0.14 249)
-
Step 600
600 (this color)
#127DCF
oklch(57.7% 0.153 249)
-
Step 700
700
#0063A9
oklch(49% 0.136 249.1)
-
Step 800
800
#00518C
oklch(42.7% 0.118 249.2)
-
Step 900
900
#104470
oklch(37.8% 0.092 248.9)
-
Step 950
950
#0C2841
oklch(27% 0.058 248.6)
#127DCF 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) | #5482D2 | 0.049 |
| Deuteranopia (no green cones) | #3672CD | 0.031 |
| Tritanopia (no blue cones) | #00919C | 0.110 |
| Achromatopsia (no color) | #7A7A7A | 0.153 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #127DCF
#127DCF
oklch(57.7% 0.153 249)
- #A96900
#A96900
oklch(57.7% 0.126 68.6)
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 #127DCF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.029
- Water Blue #0E87CC ΔE 0.029
- Nice Blue #107AB0 ΔE 0.048
- Steel Blue #4682B4 ΔE 0.055
- Cool Blue #4984B8 ΔE 0.055
- Mid Blue #276AB3 ΔE 0.062
- Flat Blue #3C73A8 ΔE 0.062
- Dark Sky Blue #448EE4 ΔE 0.065
Use #127DCF 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.