#197BC3
Closest named color: Windows Blue (#3778BF). oklch(56.6% 0.139 247), rgb(25, 123, 195).
Aa
Black text reads best on this color (4.66:1).
About this color
#197BC3 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 57%, its chroma 0.139 and its hue 247°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.017 away. Black text reads best on it, at 4.66:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.139) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.66:1 |
| White text | 4.50:1 |
Values
| HEX | #197BC3 |
| RGB | rgb(25, 123, 195) |
| HSL | hsl(205, 77%, 43%) |
| OKLCH | oklch(56.6% 0.139 247) |
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 #197BC3 | 4.50:1 | AA | Lc -76.2 | Fine for body text |
| Black text on #197BC3 | 4.66:1 | AA | Lc 33.3 | Non-text elements, placeholder text |
| #197BC3 text on white | 4.50:1 | AA | Lc 70.8 | Content text, not long reading |
| #197BC3 text on black | 4.66:1 | AA | Lc -30.9 | 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
#E1EBF6
oklch(93.6% 0.018 250.6)
-
Step 200
200
#C7DCEF
oklch(88.5% 0.035 245.5)
-
Step 300
300
#A0C5E8
oklch(80.9% 0.064 247.2)
-
Step 400
400
#6BA6DC
oklch(70.6% 0.101 247.3)
-
Step 500
500
#3F8FD2
oklch(63.1% 0.128 247)
-
Step 600
600 (this color)
#197BC3
oklch(56.6% 0.139 247)
-
Step 700
700
#0064A5
oklch(49% 0.13 247.2)
-
Step 800
800
#095286
oklch(42.7% 0.108 247.1)
-
Step 900
900
#14446B
oklch(37.6% 0.084 247.3)
-
Step 950
950
#0E283F
oklch(26.9% 0.054 248)
#197BC3 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) | #587FC6 | 0.051 |
| Deuteranopia (no green cones) | #3F70C2 | 0.035 |
| Tritanopia (no blue cones) | #008C96 | 0.097 |
| Achromatopsia (no color) | #777777 | 0.139 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #197BC3
#197BC3
oklch(56.6% 0.139 247)
- #A66500
#A66500
oklch(56.6% 0.125 67)
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 #197BC3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.017
- Nice Blue #107AB0 ΔE 0.030
- Water Blue #0E87CC ΔE 0.034
- Flat Blue #3C73A8 ΔE 0.045
- Steel Blue #4682B4 ΔE 0.046
- Cool Blue #4984B8 ΔE 0.048
- Mid Blue #276AB3 ΔE 0.049
- French Blue #436BAD ΔE 0.053
Use #197BC3 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.