#1F7BC3
Closest named color: Windows Blue (#3778BF). oklch(56.8% 0.138 247.7), rgb(31, 123, 195).
Aa
Black text reads best on this color (4.67:1).
About this color
#1F7BC3 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 57%, its chroma 0.138 and its hue 248°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.015 away. Black text reads best on it, at 4.67:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.138) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.67:1 |
| White text | 4.48:1 |
Values
| HEX | #1F7BC3 |
| RGB | rgb(31, 123, 195) |
| HSL | hsl(206, 73%, 44%) |
| OKLCH | oklch(56.8% 0.138 247.7) |
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 #1F7BC3 | 4.48:1 | AA large text | Lc -76.2 | Fine for body text |
| Black text on #1F7BC3 | 4.67:1 | AA | Lc 33.4 | Non-text elements, placeholder text |
| #1F7BC3 text on white | 4.48:1 | AA large text | Lc 70.7 | Content text, not long reading |
| #1F7BC3 text on black | 4.67:1 | AA | Lc -31.0 | 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
#E1EBF6
oklch(93.6% 0.018 250.6)
-
Step 200
200
#C8DCEF
oklch(88.5% 0.034 246.8)
-
Step 300
300
#A1C5E7
oklch(80.9% 0.062 247.1)
-
Step 400
400
#6DA6DC
oklch(70.7% 0.1 248.1)
-
Step 500
500
#418FD2
oklch(63.2% 0.127 247.4)
-
Step 600
600 (this color)
#1F7BC3
oklch(56.8% 0.138 247.7)
-
Step 700
700
#0764A5
oklch(49.1% 0.129 247.8)
-
Step 800
800
#0E5286
oklch(42.7% 0.107 247.8)
-
Step 900
900
#16446B
oklch(37.6% 0.083 247.9)
-
Step 950
950
#0F283F
oklch(27% 0.053 248.7)
#1F7BC3 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) | #597FC6 | 0.050 |
| Deuteranopia (no green cones) | #4070C2 | 0.034 |
| Tritanopia (no blue cones) | #008C96 | 0.097 |
| Achromatopsia (no color) | #777777 | 0.138 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1F7BC3
#1F7BC3
oklch(56.8% 0.138 247.7)
- #A66600
#A66600
oklch(56.8% 0.125 67.8)
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 #1F7BC3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.015
- Nice Blue #107AB0 ΔE 0.031
- Water Blue #0E87CC ΔE 0.033
- Steel Blue #4682B4 ΔE 0.044
- Flat Blue #3C73A8 ΔE 0.044
- Cool Blue #4984B8 ΔE 0.047
- Mid Blue #276AB3 ΔE 0.050
- French Blue #436BAD ΔE 0.052
Use #1F7BC3 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.