#197ACD
Closest named color: Windows Blue (#3778BF). oklch(57% 0.153 250.4), rgb(25, 122, 205).
Aa
Black text reads best on this color (4.70:1).
About this color
#197ACD is a medium-dark, vivid blue. In OKLCH its lightness is 57%, its chroma 0.153 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.025 away. Black text reads best on it, at 4.70:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | vivid (0.153) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.70:1 |
| White text | 4.46:1 |
Values
| HEX | #197ACD |
| RGB | rgb(25, 122, 205) |
| HSL | hsl(208, 78%, 45%) |
| OKLCH | oklch(57% 0.153 250.4) |
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 #197ACD | 4.46:1 | AA large text | Lc -75.9 | Fine for body text |
| Black text on #197ACD | 4.70:1 | AA | Lc 33.7 | Non-text elements, placeholder text |
| #197ACD text on white | 4.46:1 | AA large text | Lc 70.4 | Content text, not long reading |
| #197ACD text on black | 4.70:1 | AA | Lc -31.2 | 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
#C7DCF2
oklch(88.6% 0.038 249.5)
-
Step 300
300
#A0C5EC
oklch(81% 0.068 250)
-
Step 400
400
#6AA5E3
oklch(70.7% 0.11 250.8)
-
Step 500
500
#3D8DDB
oklch(63.1% 0.141 250.6)
-
Step 600
600 (this color)
#197ACD
oklch(57% 0.153 250.4)
-
Step 700
700
#0062AC
oklch(49% 0.141 250.5)
-
Step 800
800
#08518C
oklch(42.8% 0.117 250.1)
-
Step 900
900
#134370
oklch(37.6% 0.092 250.7)
-
Step 950
950
#0D2842
oklch(27.1% 0.059 250.2)
#197ACD 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) | #5180D0 | 0.046 |
| Deuteranopia (no green cones) | #3270CB | 0.027 |
| Tritanopia (no blue cones) | #008E99 | 0.112 |
| Achromatopsia (no color) | #777777 | 0.153 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #197ACD
#197ACD
oklch(57% 0.153 250.4)
- #A46800
#A46800
oklch(56.9% 0.123 70.3)
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 #197ACD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.025
- Water Blue #0E87CC ΔE 0.036
- Nice Blue #107AB0 ΔE 0.046
- Mid Blue #276AB3 ΔE 0.054
- Steel Blue #4682B4 ΔE 0.057
- Flat Blue #3C73A8 ΔE 0.058
- Cool Blue #4984B8 ΔE 0.058
- Royal Blue #4169E1 ΔE 0.060
Use #197ACD 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.