#1D7CCC
Closest named color: Windows Blue (#3778BF). oklch(57.5% 0.149 249.7), rgb(29, 124, 204).
Aa
Black text reads best on this color (4.80:1).
About this color
#1D7CCC is a medium-dark, vivid blue. In OKLCH its lightness is 57%, its chroma 0.149 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.023 away. Black text reads best on it, at 4.80:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | vivid (0.149) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.80:1 |
| White text | 4.36:1 |
Values
| HEX | #1D7CCC |
| RGB | rgb(29, 124, 204) |
| HSL | hsl(207, 75%, 46%) |
| OKLCH | oklch(57.5% 0.149 249.7) |
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 #1D7CCC | 4.36:1 | AA large text | Lc -75.2 | Fine for body text |
| Black text on #1D7CCC | 4.80:1 | AA | Lc 34.3 | Non-text elements, placeholder text |
| #1D7CCC text on white | 4.36:1 | AA large text | Lc 69.8 | Content text, not long reading |
| #1D7CCC text on black | 4.80:1 | AA | Lc -31.9 | 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
#E0EBF7
oklch(93.5% 0.02 250.4)
-
Step 200
200
#C7DCF1
oklch(88.5% 0.037 248.2)
-
Step 300
300
#A0C5EB
oklch(81% 0.067 249.3)
-
Step 400
400
#6AA5E1
oklch(70.6% 0.108 250)
-
Step 500
500
#3E8ED8
oklch(63.2% 0.136 249.4)
-
Step 600
600 (this color)
#1D7CCC
oklch(57.5% 0.149 249.7)
-
Step 700
700
#0063AB
oklch(49.2% 0.138 249.7)
-
Step 800
800
#09518A
oklch(42.7% 0.114 249.5)
-
Step 900
900
#14446F
oklch(37.8% 0.089 249.5)
-
Step 950
950
#0E2841
oklch(27.1% 0.057 249.9)
#1D7CCC 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) | #5581CF | 0.047 |
| Deuteranopia (no green cones) | #3972CA | 0.029 |
| Tritanopia (no blue cones) | #008F9A | 0.107 |
| Achromatopsia (no color) | #797979 | 0.149 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1D7CCC
#1D7CCC
oklch(57.5% 0.149 249.7)
- #A76900
#A76900
oklch(57.5% 0.125 69.6)
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 #1D7CCC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.023
- Water Blue #0E87CC ΔE 0.030
- Nice Blue #107AB0 ΔE 0.044
- Steel Blue #4682B4 ΔE 0.052
- Cool Blue #4984B8 ΔE 0.052
- Flat Blue #3C73A8 ΔE 0.057
- Mid Blue #276AB3 ΔE 0.058
- French Blue #436BAD ΔE 0.061
Use #1D7CCC 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.